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WO2015008486A1 - Lave-linge - Google Patents

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Publication number
WO2015008486A1
WO2015008486A1 PCT/JP2014/003764 JP2014003764W WO2015008486A1 WO 2015008486 A1 WO2015008486 A1 WO 2015008486A1 JP 2014003764 W JP2014003764 W JP 2014003764W WO 2015008486 A1 WO2015008486 A1 WO 2015008486A1
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WO
WIPO (PCT)
Prior art keywords
current
speed
unit
electric motor
drum
Prior art date
Application number
PCT/JP2014/003764
Other languages
English (en)
Japanese (ja)
Inventor
麻田　和彦
光英 東
元 野嶋
亀田　晃史
陽子 堀
Original Assignee
パナソニックＩｐマネジメント株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2013149262A external-priority patent/JP6295407B2/ja
Priority claimed from JP2014032679A external-priority patent/JP6229160B2/ja
Priority claimed from JP2014032680A external-priority patent/JP6361018B2/ja
Priority claimed from JP2014032684A external-priority patent/JP6229162B2/ja
Application filed by パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Priority to DE112014003296.4T priority Critical patent/DE112014003296T5/de
Priority to CN201480040857.4A priority patent/CN105378174B/zh
Publication of WO2015008486A1 publication Critical patent/WO2015008486A1/fr

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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/42—Safety arrangements, e.g. for stopping rotation of the receptacle upon opening of the casing door
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H02M7/53875—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output
    • H02M7/53876—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output based on synthesising a desired voltage vector via the selection of appropriate fundamental voltage vectors, and corresponding dwelling times
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/36—Arrangements for braking or slowing; Four quadrant control
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
    • H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
    • H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an AC motor
    • H02P3/22—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an AC motor by short-circuit or resistive braking
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/24—Arrangements for stopping
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/24—Spin speed; Drum movements
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/40—Opening or locking status of doors
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/44—Current or voltage
    • D06F2103/46—Current or voltage of the motor driving the drum
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/44—Opening, closing or locking of doors
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/46—Drum speed; Actuation of motors, e.g. starting or interrupting
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/46—Drum speed; Actuation of motors, e.g. starting or interrupting
    • D06F2105/48—Drum speed
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/08—Control circuits or arrangements thereof
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/10—Power supply arrangements, e.g. stand-by circuits

Definitions

  • the present invention relates to a washing machine for storing clothes, having a drum having a vertical or horizontal rotating shaft, and stopping while applying a brake.
  • an inverter device used in a washing machine detects rotor position detecting means such as a Hall IC of a motor and detects rotation of the motor by motor rotation detecting means or counter electromotive force detecting means.
  • rotor position detecting means such as a Hall IC of a motor
  • counter electromotive force detecting means When the rotation of the motor is detected by the rotor position detecting means or the counter electromotive force detecting means other than when the motor is driven, a short-circuit brake is performed.
  • FIG. 51 is a circuit diagram of a conventional washing machine (see, for example, Patent Document 1).
  • An inverter circuit 941 that supplies current to the windings of a motor 940 of a conventional washing machine has switching elements 942 to 947, and is turned on / off by a control unit 948.
  • a conventional washing machine has amplification / bias circuits 952 and 953 including shunt resistors 950 and 951 and operational amplifiers in order to detect a current flowing through the winding of the motor 940.
  • the output signals of the amplification / bias circuits 952 and 953 are input to the control unit 948, the current values of the U phase and the V phase are detected, and the W phase is also calculated from the currents of the U phase and the V phase. Current is detected.
  • an overcurrent detection signal from the overcurrent detection unit 956 is also input to the control unit 948 via the diodes 954 and 955 at the time of overcurrent.
  • FIG. 52 is a flowchart when starting the conventional washing machine. From the start-up (step S960) to the short circuit (step S961), the windings of the motor 940 are also short-circuited for all three phases.
  • step S962 it is determined by the current detection means whether or not the detected winding currents match three or more phases. If they match, it is determined that the motor 940 has stopped.
  • step S963 positioning
  • step S964 forced commutation
  • step S965 steady operation
  • FIG. 53 is a waveform diagram of the winding current during the short-circuit brake when the conventional washing machine is rotating.
  • the instantaneous value of the current for two phases of the current of three phases may match, but the value for three phases does not match, and stops when the current values for three phases match It is judged.
  • the current detection value of one phase is referred to twice or more at intervals shorter than one cycle of the current waveform, and when they match, it is determined to be stopped.
  • the current detection values for the three phases may coincide with each other even during rotation, and the current detection values for two times of one phase may coincide. There is.
  • a condition for stop determination is satisfied. If the drum lid is opened in this state, it becomes unsafe.
  • Patent Documents 2 to 5 disclose conventional washing machine technologies.
  • the present invention solves the conventional problems and provides a washing machine that can ensure safety without providing a position detector such as a Hall IC.
  • the washing machine of the present invention includes a drum for storing clothes, a permanent magnet and a three-phase winding, an electric motor for driving the drum, a lid for opening and closing the opening of the drum, and a lid lock portion for locking the lid.
  • a drum for storing clothes, a permanent magnet and a three-phase winding
  • an electric motor for driving the drum
  • a lid for opening and closing the opening of the drum
  • a lid lock portion for locking the lid.
  • the control unit includes a current detection unit that detects a current and a speed calculation unit that receives the output of the current detection unit and calculates the speed of the electric motor.
  • the control unit controls the switching element so as to keep the input voltage of the electric motor at substantially zero during the braking period of the drum, and allows the lid to be opened by the lid lock unit after the speed becomes a predetermined value or less. To do.
  • the washing machine of the present invention can ensure safety without providing a position detector such as a Hall IC.
  • FIG. 1 is a block diagram of an inverter device according to Embodiment 1 of the present invention.
  • FIG. 2 is a block diagram showing a detailed configuration in central control unit 135 of the inverter device according to Embodiment 1 of the present invention.
  • FIG. 3 is an operation waveform diagram when the inverter device according to the first embodiment of the present invention becomes a short-circuit brake by an abnormality detection signal.
  • FIG. 4 is an operation waveform diagram before and after the drum of the inverter device according to Embodiment 1 of the present invention stops.
  • FIG. 5 is an operation waveform diagram when the short-circuit braking period is entered by the brake request signal from the sequence generator of the inverter device according to the first embodiment of the present invention.
  • FIG. 6 is an operation waveform diagram centering on the speed calculation unit before and after the drum stops after moving to the short-circuit braking period by the brake request signal of the inverter device according to the first embodiment of the present invention.
  • FIG. 7 is a diagram showing an internal configuration of the drum type washing machine provided with the inverter device according to the first embodiment of the present invention as viewed from the side.
  • FIG. 8 is a flowchart showing an operation immediately after the power of the inverter device according to the first embodiment of the present invention is turned on.
  • FIG. 9 is a block diagram of an inverter device according to Embodiment 2 of the present invention.
  • FIG. 10 is a block diagram of an inverter device according to Embodiment 3 of the present invention.
  • FIG. 11 is a block diagram showing a detailed configuration of the central control unit of the inverter device according to Embodiment 3 of the present invention.
  • FIG. 12 is a block diagram of the short-circuit brake control unit of the inverter device according to Embodiment 3 of the present invention.
  • FIG. 13 is a graph showing input / output characteristics of the function generator of the inverter device according to Embodiment 3 of the present invention.
  • FIG. 14 is a diagram showing an internal configuration of an inverter device called a drum-type washing machine according to Embodiment 3 of the present invention as viewed from the side.
  • FIG. 15 is an operation waveform diagram in the case where a short circuit brake is caused by a brake request signal of the inverter device in the third embodiment of the present invention.
  • FIG. 16 is an operation waveform diagram of the inverter device according to the third embodiment of the present invention.
  • FIG. 17 is a flowchart in the third embodiment of the present invention when the dehydrating operation or the like is completed and the brake is applied halfway.
  • FIG. 18 is a block diagram of the central processing unit of the inverter device according to the fourth embodiment of the present invention.
  • FIG. 19 is an operation waveform diagram of the inverter device according to the fourth embodiment of the present invention.
  • FIG. 20 is a flowchart in the fourth embodiment of the present invention when the dehydrating operation or the like is completed and the brake is applied halfway.
  • FIG. 21 is a diagram showing operation waveforms of respective parts before and after the current supply period to the electric motor after the drum speed becomes substantially zero during braking in the fifth embodiment of the present invention.
  • FIG. 22 is a diagram showing the phases of the permanent magnets of the electric motor when the belt according to the fifth embodiment of the present invention is normal and when the belt is removed (or disconnected).
  • FIG. 23 is a diagram showing operation waveforms of respective parts before and after the current supply period to the electric motor after the drum speed becomes substantially zero during braking in the inverter device according to the sixth embodiment of the present invention.
  • FIG. 24 is a block diagram of an inverter device according to Embodiment 7 of the present invention.
  • FIG. 25 is a detailed configuration diagram of the central control unit of the inverter device according to the seventh embodiment of the present invention.
  • FIG. 26 is a block diagram of a short-circuit brake control unit of the inverter device according to Embodiment 7 of the present invention.
  • FIG. 27 is a graph showing the function generator of the inverter device according to Embodiment 7 of the present invention and the input / output characteristics of the function generator.
  • FIG. 28 is an operation waveform diagram when a short-circuit brake is established by a brake request signal of the inverter device according to the seventh embodiment of the present invention.
  • FIG. 29 is an operation waveform diagram of the inverter device according to the seventh embodiment of the present invention.
  • FIG. 30 is an operation waveform diagram of the inverter device according to the seventh embodiment of the present invention.
  • FIG. 31 is a block diagram of the short-circuit brake control unit of the inverter device according to the eighth embodiment of the present invention.
  • FIG. 32 is a graph showing characteristics of the short circuit time ratio expansion speed setting unit of the inverter device according to the eighth embodiment of the present invention.
  • FIG. 33 is a block diagram of the short-circuit brake control unit of the inverter device according to the ninth embodiment of the present invention.
  • FIG. 34 is a graph showing characteristics of the short circuit time ratio expansion speed setting unit of the inverter device according to the ninth embodiment of the present invention.
  • FIG. 35 is an operation waveform diagram of a portion of the inverter device that enters the short-circuit braking period according to Embodiment 9 of the present invention.
  • FIG. 36 is a block diagram of the short-circuit brake control unit of the inverter device according to Embodiment 10 of the present invention.
  • FIG. 37 is a graph illustrating characteristics of the short-circuiting time ratio expansion speed command unit of the inverter device according to the tenth embodiment of the present invention.
  • FIG. 38 is a diagram showing an internal configuration of an inverter device called a drum-type washing machine according to Embodiment 11 of the present invention viewed from the side.
  • FIG. 39 is a flowchart immediately after the power of the inverter device according to the eleventh embodiment of the present invention is turned on.
  • FIG. 40 is a block diagram of the inverter device according to the twelfth embodiment of the present invention.
  • FIG. 41 is a diagram showing a current vector during a short-circuit braking period of the inverter device according to the twelfth embodiment of the present invention.
  • FIG. 42 is an operation waveform diagram for the short-circuit braking period of the inverter device according to the twelfth embodiment of the present invention.
  • FIG. 43 is a block diagram of an inverter device according to Embodiment 13 of the present invention.
  • FIG. 44 is a flowchart of the microcomputer of the inverter device according to the thirteenth embodiment of the present invention.
  • FIG. 45 is an operation waveform diagram of the microcomputer of the inverter device according to the thirteenth embodiment of the present invention.
  • FIG. 46 is a diagram illustrating a case where the magnitude of the current vector is less than a predetermined value twice in FIG.
  • FIG. 47 is a flowchart of the inverter device according to the fourteenth embodiment of the present invention.
  • FIG. 48 is a graph showing characteristics of the load stop estimation unit of the inverter device according to the fourteenth embodiment of the present invention.
  • FIG. 49 is a diagram showing an internal configuration of the dehydrator according to the fifteenth embodiment of the present invention when viewed from the side.
  • FIG. 50 is an operation waveform diagram of the dehydrator according to the fifteenth embodiment of the present invention.
  • FIG. 51 is a circuit diagram of a conventional washing machine.
  • FIG. 52 is a flowchart when the conventional washing machine is activated.
  • FIG. 53 is a winding current waveform diagram during short-circuit braking when the conventional washing machine is rotating.
  • FIG. 1 is a block diagram of an inverter device according to Embodiment 1 of the present invention.
  • the drum 1 includes permanent magnets 100 and 101 and three-phase windings 102, 103, and 104. Moreover, it has the drum 106 which accommodates the clothing 105, the electric motor 109 which rotationally drives via the pulley 107 and the belt 108, and the 6 stone switching elements 111, 112, 113, 114, 115, 116.
  • an inverter circuit 117 that supplies alternating currents Iu, Iv, and Iw to the electric motor 109 and a control unit 118 that performs on / off control of the switching elements 111, 112, 113, 114, 115, and 116 are provided.
  • the control unit 118 also includes a current detection unit 119 that detects the alternating currents Iu, Iv, and Iw, and a speed calculation unit 120 that receives the output of the current detection unit 119 and calculates the speed of the electric motor 109.
  • the current detection unit 119 performs A / D conversion in the ON period of the shunt resistors 121, 122, 123 that convert the currents of the three phases into voltages and the switching elements 114, 115, 116 on the low potential side.
  • a D converter 124 is included.
  • the speed calculation unit 120 includes a phase error detection unit 126 and an amplifier 128 and an integrator 129 as the variable frequency oscillation unit 127.
  • three resistance shunt resistors 121, 122, and 123 corresponding to each of the three phases are used as the current detection unit 119. These are structures called three shunts. While the low-potential side switching elements 114, 115, and 116 are on, the voltage generated across each shunt resistor is detected.
  • the current values Iu, Iv, and Iw of the three phases may be detected from a single shunt resistor called one shunt at the detection timing.
  • two to three current sensors that can be detected from a direct current component called DCCT may be used.
  • the amplifier 128 has a P component (proportional component) and an I component (time integration component) with respect to the input.
  • the input to the amplifier 128, that is, the output of the phase error detector 126 is constantly zero. Works as.
  • the control unit 118 includes a low speed determination unit 130 that determines that the output signal ⁇ of the variable frequency oscillation unit 127 has become a sufficiently low speed.
  • the low speed determination unit 130 includes a threshold generator 131 and a comparison unit 132.
  • control unit 118 has a central control unit 135.
  • the control unit 118 generates a signal for controlling the inverter circuit 117, receives signals Iua, Iva, and Iwa from the current detection unit 119, receives signals ⁇ and ⁇ from the speed calculation unit 120, and receives a low-speed determination unit. 130 J signals are received.
  • the control unit 118 performs all these various signal processes in a digital manner.
  • the PWM circuit 136 receives the duty from the central control unit 135 and outputs a signal B obtained by performing pulse width modulation (PWM) with a triangular wave having a period of 64 microseconds on the duty.
  • the signals S1 to S6 of the central control unit 135 give gate signals to the switching elements 111, 112, 113, 114, 115, and 116 via the switching unit 137 and the drive circuit 138 provided between the central control unit 135 and the inverter circuit 117. .
  • the K signal of the central control unit 135 is high, the switching unit 137 is displayed as shown in FIG. 1, and S1 to S6 are employed.
  • the switches in the switching unit 137 in FIG. 1 are connected to the lower side.
  • the DC power supply 144 includes an AC power supply 141 of AC 230 V, 50 Hz, a full-wave rectifier 142, and a capacitor 143.
  • DC power supply 144 supplies DC voltage VDC to DC voltage detection circuit 148 in inverter circuit 117.
  • DC voltage detection circuit 148 includes resistors 146 and 147.
  • the output A of the DC voltage detection circuit 148 is output to the central control unit 135 as an analog voltage signal. In the central control unit 135, the output A is A / D converted and processed as a digital value.
  • FIG. 2 is a block diagram showing a detailed configuration of the central control unit 135 of the inverter device according to Embodiment 1 of the present invention.
  • the component constituting the central control unit 135 is often a one-chip microcomputer.
  • the configuration including the portion outside the central control unit 135 of FIG. 1 may be realized by software of one microcomputer.
  • the components constituting the central control unit 135 may be realized by some hardware.
  • signals Iua, Iva, Iwa corresponding to the three-phase currents Iu, Iv, Iw are input to the first coordinate converter 150 together with the calculated phase ⁇ signal.
  • the first coordinate conversion unit 150 using (Equation 1), conversion to Id and Iq, that is, conversion from stationary coordinates to rotation coordinates, is performed, and Id and Iq are output.
  • Subtraction units 151 and 152 are provided, and an error between the set values Idr and Id and an error between the set values Iqr and Iq are calculated, respectively.
  • the outputs of the subtracting units 151 and 152 are input to error amplifying units 153 and 154 that apply a gain of PI (proportional and integral), and the outputs are input to the switching unit 156 as Vd1 and Vq1.
  • the outputs Vd and Vq of the switching unit 156 are input to the second coordinate conversion unit 158 together with the phase ⁇ signal, and from the dq coordinates to the values of the three-phase voltage command values Vu, Vv, and Vw using (Equation 2). Conversion is performed.
  • the voltage command values Vu, Vv, and Vw are input to the PWM unit 159, and a triangular carrier wave having a period of 64 ⁇ s is applied at a ratio of the three-phase voltage command value to the A signal.
  • Voltage command values Vu, Vv, Vw are subjected to instantaneous value comparison with the carrier wave and added with dead time to generate upper and lower drive signals S1 to S6.
  • the current detection unit 119 is configured to detect all three phase currents. However, if the current of two phases in the three-phase windings 102, 103, 104 of the electric motor 109 is detected, the remaining one phase can be calculated by Kirchhoff's law. Therefore, only two-phase detection may be performed.
  • the subtraction unit 160 calculates the difference between the speed setting values ⁇ r and ⁇ .
  • a gain of PI proportional, integral
  • the Idr setting unit 162 determines the set value Idr from the calculated speed ⁇ .
  • the short circuit brake control unit 163 and the abnormality detection unit 165 detect an abnormality.
  • the delay unit 166 outputs the Z signal with a delay time of 0.3 seconds from the J signal.
  • the sequence generator 167 generates a set speed ⁇ r when the electric motor 109 is driven and a brake request signal B4RQ.
  • the voltage command throttle unit 168 receives the brake request signal B4RQ, inputs Vd1 and Vq1 at the start of the transition to the short-circuit brake, and outputs a value approaching zero.
  • the sequence generator 167 Since the inverter device operates as a washing machine, the sequence generator 167 has various signals (stop button signal Sstop, water supply valve signal Skb, drain valve signal Shb, lid lock signal Srk, lid closure signal Scl) with external components. Etc.), various signals relating to the operation of the electric motor 109 are transmitted and received.
  • the short-circuit current determination unit 170 sets the Cl signal to high when any of the instantaneous values of the signals Iua, Iva, and Iwa in the short-circuit state exceeds 1.7 A, and all the absolute values of the instantaneous values are When it is less than 0.6 A, the Cs signal is set to high.
  • the Idr setting unit 162 outputs 0A as the set value Idr when the ⁇ value is 400 r / min or less in terms of the speed of the drum 106.
  • the short-circuit brake control unit 163 controls the electric motor 109 in the brake state when some abnormality occurs in the washing machine and at the time of the break of operation.
  • the short circuit brake control unit 163 receives the abnormality detection signal B99RQ from the abnormality detection unit 165 and the brake request signal B4RQ from the sequence generation unit 167.
  • the short circuit brake control unit 163 gradually shorts the input of the electric motor 109, that is, the switching elements 111, 112, 113 in the inverter circuit 117 so that the voltage between the three-phase input terminals becomes almost zero. , 114, 115, and 116 are controlled.
  • the case where the abnormality detection signal B99RQ is received and the case where the brake request signal B4RQ is received are both short-circuit brakes, but the specific signal to the inverter circuit 117 is considerably different.
  • FIG. 3 is an operation waveform diagram in the case where the inverter device according to the first embodiment of the present invention becomes a short-circuit brake by the abnormality detection signal B99RQ.
  • 3A is a waveform diagram of the abnormality detection signal B99RQ
  • FIG. 3B is a waveform diagram of the K signal
  • FIG. 3C is a waveform diagram of Duty.
  • the brake request signal BRQ of the central control unit 135 becomes high at time T1.
  • the K signal goes from high to low.
  • all IGBT (Insulated Gate Bipolar Transistor) portions of the switching elements 111, 112, 113, 114, 115, and 116 are turned off. This is an all-off period of 5 ms.
  • the input voltage of the electric motor 109 repeats positive / negative as an instantaneous value of the induced electromotive force generated by rotation. However, it is forced to zero during the short circuit time, and the absolute value is suppressed.
  • the short circuit time ratio expansion period from T2 to T5 is a voltage reduction period in which the switching elements 114, 115, and 116 are controlled so that the absolute value of the voltage decreases as the short circuit time increases. .
  • the control unit 118 turns on the low potential side switching elements 114, 115, and 116 in the inverter circuit 117.
  • the process proceeds to the short-circuit braking period.
  • the short-circuit time ratio Duty is kept at the maximum, that is, 100%, and the kinetic energy of the load is absorbed.
  • the voltage drop of the IGBT and the diode in the low potential side switching elements 114, 115, 116 and the voltage drop due to the wiring from the inverter circuit 117 to the motor 109 are the input of the motor 109.
  • about 2 to 3 V remains as a voltage.
  • such voltages are in the category of approximately zero.
  • the design is made to increase the short circuit time ratio (Duty) expansion speed in T3 to T5, which is the latter half of the short circuit time ratio expansion period. Thereby, an overvoltage can be suppressed to the minimum.
  • the electric motor 109 does not have a position detection sensor and a speed detection sensor, and can be configured at a low cost. Such a configuration is called sensorless.
  • FIG. 4 is an operation waveform diagram before and after the drum 106 of the inverter device according to Embodiment 1 of the present invention is stopped.
  • FIG. 4 shows operation waveforms when a further time elapses from the period shown in FIG.
  • FIG. 4A shows the speed of the drum 106
  • FIG. 4B shows the current waveforms of Iu, Iv, and Iw
  • FIG. 4C shows the Cs signal output by the short-circuit current determination unit 170.
  • the speed of the electric motor 109 that has become a short-circuit brake gradually decreases.
  • the frequency of the line current decreases approximately in proportion to the speed of the electric motor 109, the amplitude finally decreases, and converges to zero when the speed of the electric motor 109 becomes zero.
  • the output of the current detection unit 119 in the case of zero current is about 2.5V, which is an almost intermediate value of the 5V power supply.
  • the switching elements 114, 115 and 116 before the start of operation store the values in the off state as offset values corresponding to zero current, and handle them as absolute values of the line currents of the respective phases.
  • the time from when the short-circuit brake is entered until it stops is the speed of the motor 109, the moment of inertia of the load, the inductance and resistance value of the motor 109, and the ON state of the switching elements 114, 115, and 116.
  • the current detection unit 119 detects a state in which the speed is sufficiently reduced by detecting a current value that is a physical phenomenon that appears due to a reduction in speed.
  • the Cs signal becomes high at the time Tja when all the absolute values of the instantaneous values of the three line currents Iu, Iv, and Iw are less than 0.6 A, and the drum 106 moves at a speed. It decreases to about 7r / min.
  • the short-circuit brake control unit 163 receives the Cs signal that has become high, and the drum 106 is stopped by continuing the short-circuit brake from 7 r / min. For example, when a delay time of 0.15 seconds has elapsed, it is determined that the stop has occurred. In accordance with an instruction from the sequence generator 167, the process proceeds to the next step necessary for the washing machine.
  • the short-circuit current determination unit 170 may be configured to output the Cs signal high after confirming that the line current has sufficiently decreased again after the time Tja.
  • the short-circuit current determination unit 170 when the state where all the absolute values of the instantaneous values of the line currents Iu, Iv, and Iw are less than 0.6 A continues for a predetermined time or longer, the Cs signal is output high. Also good.
  • the present embodiment uses a short-circuit brake and does not use a position sensor or a speed sensor, but uses a short-circuit brake and makes a safe stop determination based on current during that period. Sex can be ensured.
  • FIG. 5 is a waveform diagram of an operation waveform diagram when the short circuit braking period is entered by the brake request signal B4RQ from the sequence generation unit 167 of the inverter device according to the first embodiment of the present invention.
  • (a) is a brake request signal B4RQ
  • (b) is the values of the input values Vq (solid line) and Vd (broken line) of the second coordinate converter 158
  • (c) is a calculated speed ⁇ (solid line). )
  • the switching unit 156 contacts the lower contact. For this reason, the outputs Vd1 and Vq1 of the error amplifiers 153 and 154 are connected to Vd and Vq, respectively. That is, the subtractors 151 and 152 are in a state where the current control of Id and Iq functions.
  • the voltage command throttle unit 168 holds Vd1 and Vq1 inside.
  • the absolute values of Vd and Vq decrease at a constant voltage change rate (dV / dt) with respect to time.
  • the switching unit 156 contacts the upper contact, and the signals Vd and Vq from the voltage command restricting unit 168 are output.
  • Vq1 is a positive value at T1
  • Vd1 is a negative value.
  • the voltage command restrictor 168 brings Vq closer to zero by subtracting from Vq1
  • Vd approaches zero by increasing from Vd1. Therefore, a change occurs in the direction of decreasing the absolute value.
  • FIG. 5 shows a case where the absolute value of Vd1 is smaller than the absolute value of Vq1.
  • the absolute value is decreased at a constant time ratio.
  • the absolute value of the gradient after T1 is equal between Vd and Vq, Vd becomes zero at T2, and Vd and Vq become zero at T3.
  • the absolute value of the input voltage of the electric motor 109 decreases to almost zero, and the electric motor 109 enters a short-circuit braking period in which kinetic energy is absorbed.
  • the input voltage of the electric motor 109 is determined by voltage command values Vu, Vv, and Vw that are output from the second coordinate conversion unit 158.
  • the period from T1 to T3 is a voltage reduction period because the voltage is controlled by the switching elements 111, 112, 113, 114, 115, and 116 so that the voltage decreases even when viewed from the line voltage.
  • Vd and Vq do not become zero at the same time, but the voltage reduction periods T1 to T3 are performed within a relatively short time of about several tens of ms, so the difference between the curves of Vd and Vq.
  • the adverse effects of will not be noticeable. It does not cause a problem because it does not cause an overcurrent due to a transient jump of the line current or a DC voltage overvoltage due to regenerative power to the DC power supply 144.
  • the output ⁇ of the amplifier 128 is fixed to the calculated speed ⁇ 1 at the time T1 when the brake request signal B4RQ starts only during the voltage reduction period. This ensures the stability of the feedback.
  • the change in Vd and Vq during the voltage reduction period may be other, for example, the slope adjusted so that Vd and Vq are simultaneously zero.
  • the magnitude of the time change of Vd and Vq may be changed according to the speed of the electric motor 109 when entering the short-circuit braking period. Assuming that the slopes of Vd and Vq are small at low speed and large at high speed, at any speed, the transient current jump (overcurrent) during the voltage reduction period is suppressed, and the regeneration to the DC power supply at particularly high speed is performed. Generation of overvoltage due to current can be suppressed as much as possible.
  • the slope a of Vd and Vq during the voltage reduction period may be changed so that the initial slope is large and the slope is small, so that it corresponds to a wide range of speeds.
  • the input voltage of the electric motor 109 may not be completely zero.
  • the voltage drop due to the IGBT or the diode is 2 to 3 V or less, but may occur.
  • the carrier frequency is as high as about a few dozen kilohertz, so there may be a case where the input voltage of the electric motor 109 of about several volts remains, but the input voltage of about several volts. Is a category of almost zero.
  • FIG. 6 shows a speed calculation unit 120 before and after the electric motor 109 and the drum 106 serving as a load stop after the passage of the short-circuit braking period by the brake request signal B4RQ of the inverter device according to the first embodiment of the present invention.
  • FIG. In FIG. 6, (a) shows the line current Iu, (b) shows the angular velocity ⁇ , (c) shows the phase ⁇ of Iu, and (d) shows the waveform of the J signal.
  • the signal Iua corresponding to the U phase in the signal that has passed through the current detection unit 119 is taken into the phase error detection unit 126, the U phase current Iu waveform, and the output of the variable frequency oscillation unit 127.
  • a signal corresponding to the phase difference from ⁇ is generated.
  • phase difference comparison from the zero point timing or multiplication of two input signals is used.
  • a kind of phase-locked loop (PLL) is formed, the output of which is constituted by a control loop composed of an amplifier 128 and an integrator 129.
  • PLL phase-locked loop
  • the ⁇ output of the amplifier 128 can be used as the speed during the short-circuit braking period. For this reason, at time T1 when ⁇ falls below the value ⁇ th of the threshold generator 131, the J signal of the comparison unit 132 is output.
  • the time point T1 is the time point when the speed of the drum 106 is 35 r / min, and the J signal becomes high at ⁇ th.
  • the determination is made by interposing a physical quantity such as speed or a frequency corresponding one-to-one with the speed. Therefore, in particular, in the case of the drum type washing machine of the present embodiment, the point of speed fluctuation (acceleration) due to the fact that the moment of inertia of the drum 106 is about 0.3 kg square meters or more is effectively utilized, and the response of ⁇ A low-pass element can also be used as long as the characteristics can be sufficiently realized. Therefore, the influence of the noise of the output of the current detection unit 119 can be suppressed to be extremely low. Therefore, a highly reliable ⁇ signal can be obtained until just before the stop.
  • the delay unit 166 causes the Z signal to go high after a delay of 0.3 seconds. This 0.3 second corresponds to a required time for stopping the drum 106 by continuing the short-circuit brake from 35 r / min as the speed of the drum 106.
  • the speed calculation unit 120 is used when short-circuit braking is performed by the brake request signal B4RQ from the sequence generation unit 167.
  • the noise is not affected at all as long as the phase error detection unit 126 is in a normal working range.
  • the influence as the speed calculation unit 120 can be suppressed by the integral gain in the amplifier 128. . Therefore, safety can be ensured by determining a reliable stop.
  • control unit 118 switches the switching elements 111, 112, 113, so as to keep the input voltage of the electric motor 109 substantially zero during the short-circuit braking period in which the kinetic energy from the drum is absorbed.
  • 114, 115, and 116 are controlled, and after the calculated speed ⁇ becomes equal to or less than the predetermined value ⁇ th, stop is determined.
  • the stop of the electric motor 109 can be appropriately determined while having a simple configuration without a position detector such as a Hall IC. Therefore, safety can be ensured.
  • the Cs signal is not used for the stop determination at the time of the brake request signal B4RQ, but may be used together.
  • the stop state may be determined by confirming the state of the Cs signal again 0.3 seconds after the Z signal is generated.
  • the current becomes small and the Cl signal goes low until the judgment of 35 r / min is made, and the judgment of stop is not made forever and the inverter device is closed.
  • the stop may be determined after a sufficient time has elapsed. As a result, it is possible to proceed to the next sequence in a form that satisfies both safety and convenience of the inverter device.
  • the speed calculation unit 120 determines that the calculated speed is equal to or less than the predetermined value. It may be determined that the electric motor 109 has stopped.
  • FIG. 7 is a diagram showing an internal configuration of an inverter device generally called a drum type washing machine in the present embodiment as viewed from the side.
  • the inverter device includes a drum 106 that houses clothing 105, an electric motor 109 that rotationally drives the drum 106 via a pulley 182 and a belt 108, and an inverter circuit 117 that supplies a three-phase alternating current to the electric motor 109. have.
  • the inverter circuit 117 is operated by a control signal for 6 stones from the control unit 118.
  • the inverter device corresponds to the abnormality detection signal B99RQ and the brake request signal B4RQ described above, respectively, the voltage reduction period in the B99RQ signal shown in FIG. 3, and the voltage reduction in the brake request signal B4RQ shown in FIG. After a period of time, a short circuit braking period starts.
  • the drum 106 rotates inside the resin-made receiving cylinder 190.
  • the water supply valve 193 and the drainage valve 194 By opening and closing the water supply valve 193 and the drainage valve 194 by the water supply valve signal Skb and the drainage valve signal Shb from the control unit 118, water is supplied and drained into the receiving tube 190, and washing and dehydration are performed together with a separately supplied detergent. Made.
  • a lid 196 that can be opened and closed is provided in front of the drum 106, and a handle 197 for the user to open and close the lid 196 is provided.
  • the lid 196 is closed to ensure the safety of the user and prevent water from scattering.
  • the lid 196 is opened and closed with a hinge part connected to the main body as a center, but it may have a sliding door configuration, a folding configuration, a shutter configuration, or a removable configuration. .
  • the lid lock unit 200 holds the lid 196 closed, and includes a solenoid 201, a plunger 202, a spring 203, and a lock control circuit 204.
  • the lid 196 In the illustrated state where the solenoid 201 is not energized, the lid 196 is in a locked state. Therefore, the lid 196 cannot be opened even if the user pulls the handle 197 or performs any other operation.
  • the lock control circuit 204 energizes the solenoid 201 by the lid lock signal Srk from the control unit 118, and the lock is released. The user can then pull the handle 197 to open the lid 196.
  • the lid detection switch 206 detects the open / closed state of the lid 196 and transmits a lid closing signal Scl to the control unit 118.
  • the lid closing signal Scl is low, and from the viewpoint of ensuring safety, no signal is supplied to the inverter circuit 117, no AC current is supplied to the electric motor 109, and the drum 106 The operation which rotates is not made.
  • a direct current may be supplied to the electric motor 109, and sufficient safety can be ensured by ensuring that the drum 106 is fixed in the rotational direction more reliably.
  • the controller 118 sends a lid lock signal Srk after determining the stop.
  • the lid lock unit 200 energizes the solenoid 201, the locked state is released, and the user can open the lid 196.
  • the dehydration operation is stopped. Further, when an abnormality such as an overload occurs in the inverter circuit 117, an abnormality signal in the control unit 118 is generated and the electric motor 109 is braked. When the drum 106 is stopped, the control unit 118 determines the stop by the brake request signal B4RQ, and the lid lock unit 200 releases the locked state. When the user pulls the handle 197, the lid 196 can be opened. Therefore, safety is ensured.
  • the speed calculation unit 120 calculates the speed at the time Tja when all of the absolute values of the instantaneous values of the three line currents Iu, Iv, and Iw are below a predetermined value, for example, 0.6 A. It may be determined that the lock state is equal to or less than a predetermined value and the locked state is released by the lid lock 200.
  • FIG. 8 is a flowchart showing an operation immediately after the power of the inverter device according to the first embodiment of the present invention is turned on.
  • step S210 When the control unit 118 is operated, such as when the power switch of the inverter device is turned on, the microcomputer program constituting the control unit 118 starts (step S210). The operation shifts from the start to the short-circuit brake (abnormality detection signal B99RQ), and the operation when the abnormality detection signal B99RQ shown in FIG. 3 occurs is performed (step S211). Thus, the short circuit braking period starts after the voltage reduction period.
  • step S213 After entering the short-circuit braking period, when the Cs signal, which is the stop determination shown in FIG. 4, becomes high, the process proceeds to unlocking (step S213).
  • the solenoid 201 is energized, and the user can open the lid 196. Thus, safety is ensured.
  • a short-circuit braking period passes after the power is turned on.
  • the danger can be eliminated by releasing the lock after the Cs signal for ensuring safety based on the stop determination becomes high. Therefore, a highly safe washing machine can be realized.
  • the lid can be unlocked and the user can open the lid 196. Therefore, a highly safe washing machine can be realized.
  • abnormality detection signal B99RQ abnormality detection signal B99RQ
  • short-circuit brake abnormality detection signal B99RQ
  • the output value of the current detector 119 in the correct zero current state is handled as an offset value. Therefore, for example, when a failure occurs in the current detection unit 119 during the short-circuit braking, there is a high possibility that the output signal is fixed regardless of the actual current value such as 0V or 5V. In that case, the possibility that the Cs signal becomes high is extremely low, and high safety is ensured.
  • the rotation axis of the drum 106 is horizontal, but it may be vertical or oblique.
  • the pulley 182 and the belt 108 are used as the power transmission path for rotationally driving the drum 106, the present invention is not limited to this.
  • a gear using a gear (gear) or a motor having a motor directly on the shaft of the drum 106 and rotating at the same speed as called direct drive may be used.
  • the configuration of the lid lock unit 200 is not limited to the configuration described in the present embodiment.
  • a plurality of lid lock portions may be provided.
  • a first lid lock unit that can be unlocked at any time by a user's handle operation and a second lid lock unit that is unlocked by a signal from the control unit may be used in combination.
  • the steering wheel operation may be disabled by a signal from the control unit. In any case, it is sufficient that the user can change whether or not the user can open the lid by a signal from the control unit.
  • the washing machine includes the drum 106 that houses the clothing 105, the permanent magnets 100 and 101, and the three-phase windings 102, 103, and 104, and the electric motor 109 that drives the drum 106.
  • a lid 196 that opens and closes the opening of the drum 106 and a lid lock portion 200 that locks the lid 196 are provided.
  • the inverter circuit 117 is supplied with power from the DC power supply 144 and supplies current to the electric motor 109 using the plurality of switching elements 111, 112, 113, 114, 115, and 116.
  • it has the control part 118 which performs on-off control of switching element 111,112,113,114,115,116.
  • the control unit 118 includes a current detection unit 119 that detects current, and a speed calculation unit 120 that receives the output of the current detection unit 119 and calculates the speed of the electric motor 109.
  • the control unit 118 controls the switching elements 111, 112, 113, 114, 115, and 116 so that the input voltage of the electric motor 109 is kept substantially zero during the braking period of the drum 106, and after the speed becomes a predetermined value or less.
  • the lid 196 can be opened by the lid lock unit 200. Thereby, safety is ensured with a simple configuration.
  • the current detection unit 119 detects a current of two or more of the three phases
  • the speed calculation unit 120 detects two or more of the three phases. The speed is calculated based on the current value. Thereby, safety is ensured with a simple configuration.
  • control unit 118 outputs the phase of the permanent magnets 100 and 101 including the time integral value of the speed, the variable frequency oscillation unit 127, the phase error detection unit 126, and the coordinate conversion unit. 150.
  • coordinate conversion unit 150 converts the output of the current detection unit 119 from a stationary coordinate to a rotation coordinate using the phase, and outputs it.
  • the speed calculation unit 120 receives the current value signal at the rotation coordinate and calculates the speed. . Thereby, safety is ensured with a simple configuration.
  • the washing machine of the present embodiment has a voltage reduction period for controlling the switching elements 114, 115, and 116 so as to reduce the absolute value of the input voltage of the electric motor 109 before the braking period. Thereby, the overvoltage of the input of an electric motor can be avoided.
  • the washing machine of the present embodiment has a braking period before allowing the lid 196 to be opened by the lid lock unit 200. Thereby, safety is ensured with a simple configuration.
  • the washing machine of the present embodiment is a sensorless system in which the electric motor 109 does not have a position detector. Thereby, stop of the electric motor 109 can be determined appropriately, and a low-cost washing machine can be provided.
  • FIG. 9 is a block diagram of an inverter device according to Embodiment 2 of the present invention.
  • the configuration for calculating the speed and the phase is particularly different from that of the first embodiment. Since other parts are equivalent, only the parts different from the first embodiment will be described.
  • the speed calculation unit 221 includes a phase error detection unit 223 that receives Vd, Vq, Id, and Iq signals from the central control unit 135, and a variable frequency oscillation unit 127. Similar to the first embodiment, the variable frequency oscillator 127 has a P component and an I component, and an amplifier 128 that outputs the calculated speed ⁇ , and an integration that performs time integration of the calculated speed ⁇ and outputs the calculated phase ⁇ . A container 129.
  • the calculation speed ⁇ is also input to the phase error detection unit 223.
  • the phase error detection unit 223 stores parameters (resistance value, maximum inductance, minimum inductance) of the electric motor 109, and calculates the phase error ⁇ from the voltage command value and the detected current value.
  • ⁇ the phase error ⁇
  • the calculated phase ⁇ is advanced with respect to the actual phase, ⁇ > 0, and when the calculated phase ⁇ is delayed with respect to the actual phase, ⁇ ⁇ 0.
  • the control loop of the amplifier 128 and the phase error detector 223 operates so that the input of the amplifier 128, that is, the output ⁇ of the phase error detector 223 becomes zero.
  • the speed calculation unit 221 receives the current value signals Id and Iq in the rotation coordinates and the voltage value signals Vd and Vq in the rotation coordinates, and calculates and outputs the speed ⁇ and the phase ⁇ .
  • calculation speed ⁇ is calculated using the previous ⁇ calculated for each carrier frequency of the inverter circuit 117 such as 64 ⁇ s, for example. As a result, a round tour of the control loop is avoided.
  • the absolute values of Vd and Vq are set to zero during the voltage reduction period, as in the first embodiment. Both Vd and Vq are set to zero during the short-circuit braking period.
  • the calculated phase ⁇ during the short-circuit braking period is kept equal to the actual phase, that is, the phases of the permanent magnets 100 and 101, and ⁇ during the short-circuit braking period can be obtained with extremely high accuracy.
  • phase error detection unit 223 As the configuration of the phase error detection unit 223, a somewhat complicated calculation is required, and a processor such as a microcomputer that realizes the calculation requires a high calculation power.
  • a processor such as a microcomputer that realizes the calculation requires a high calculation power.
  • the error of the calculated phase ⁇ with respect to the actual phase and the error between the actual speed and the calculated speed ⁇ can be suppressed very small.
  • the reliability for the calculated speed ⁇ is extremely high. Therefore, it is possible to realize an inverter device with high reliability in determining whether to stop. An inverter device with extremely high safety can be realized.
  • the inverter device has a high response with the calculated speed ⁇ and phase ⁇ in an operation called “sensorless” in which the electric motor 109 has no position sensor or speed sensor. Can operate as a performance washing machine. Therefore, the inverter device of the present embodiment can be shared with speed calculation and phase calculation during power running operation.
  • inverter device equipped with a position sensor such as a Hall IC. If a position sensor conventionally used for determining whether to stop has failed, multiple safety can be ensured.
  • the phase error ⁇ that is, the physical quantity that is the dimension of the angle in the phase error detector 223 is calculated.
  • sufficient characteristics are often obtained even using only the voltage component in the direction of the calculated magnetic flux. Thereby, the number of various calculations such as addition / subtraction / multiplication / division, trigonometric function, exponential function, and complex number calculation can be reduced. Therefore, a simpler calculation can be performed.
  • two orthogonal axes generally called vector control are often matched with the direction of magnetic flux generated by the permanent magnets 100 and 101.
  • the orthogonal two axes are not particularly limited to a configuration that perfectly matches the d-axis that is the magnetic flux axis.
  • a value different from the actual inductance value of the electric motor 109 may be used, and an axis slightly advanced in phase from the d axis may be used as a reference.
  • the electric motor 109 having the configuration in which the permanent magnets 100 and 101 are embedded deep inside the rotor has an advantage that current can be reduced rationally.
  • the error ⁇ is calculated by comparing with a voltage error, current error, speed error, inductance value error, resistance error, etc. May be. It is also possible to use a simplified mathematical expression in which the error ⁇ converges to zero and a term that has a small influence on the performance in actual operation is omitted. In any case, as the amount of calculation is reduced, the microcomputer to be used can be configured with a low capacity, low cost, and low power consumption.
  • FIG. 10 is a block diagram of an inverter device according to Embodiment 3 of the present invention.
  • the inverter device includes embedded neodymium permanent magnets 340 and 341 and three-phase windings 342, 343, and 344.
  • the drum 346 for storing the clothing 345 includes an electric motor 349 that serves as a prime mover that rotationally drives the pulley 347 via a pulley 347 and a belt 348, and six stone switching elements 351, 352, 353, 354, 355, and 356.
  • an inverter circuit 357 that performs reverse conversion from direct current to alternating current and supplies alternating currents Iu, Iv, and Iw to the electric motor 349, and a control unit 358 that controls on / off of the switching elements 351, 352, 353, 354, 355, and 356. And have.
  • control unit 358 includes a current detection unit 359 that detects the alternating currents Iu, Iv, and Iw.
  • the current detection unit 359 includes shunt resistors 361, 362, 363 and an amplifier 364 that convert the currents of the three phases into voltages.
  • the amplifier 364 receives voltages generated at both ends of the shunt resistors 361, 362, and 363 during the ON period of the switching elements 354, 355, and 356 on the low potential side, and with respect to the line currents Iu, Iv, and Iw of ⁇ 10 to + 10A. , Convert to analog voltage of 0-5V and output.
  • three shunt resistors 361, 362, 363 corresponding to each of the three phases are used as the current detection unit 359. These are structures called three shunts.
  • the current values Iu, Iv, and Iw of the three phases may be detected from a single shunt resistor called one shunt at the detection timing.
  • two to three current sensors that can be detected from a direct current component called DCCT may be used.
  • control unit 358 has a central control unit 366.
  • the control unit 358 performs signal generation for controlling the inverter circuit 357, signal reception of the output signals Iua, Iva, and Iwa from the current detection unit 359, etc., all in a digital manner.
  • the PWM circuit 367 receives the duty from the central control unit 366 and outputs a signal B that has been subjected to pulse width modulation (PWM) with a triangular wave having a period of 64 microseconds.
  • the signals S1 to S6 of the central control unit 366 give gate signals to the switching elements 351, 352, 353, 354, 355, 356, via the switching unit 369 and the drive circuit 370 provided between the central control unit 366 and the inverter circuit 357.
  • the K signal of the central control unit 366 is high, the switching unit 369 is in the state shown in FIG. 10, and S1 to S6 are adopted.
  • the switches in the switching unit 369 in FIG. 10 are connected to the lower side.
  • the DC power supply 374 is composed of an AC power supply 371 of AC 230 V 50 Hz, a full-wave rectifier 372, and a capacitor 373.
  • DC power supply 374 supplies DC voltage VDC to DC voltage detection circuit 378 in inverter circuit 357.
  • the DC voltage detection circuit 378 includes resistors 376 and 377.
  • the output A of the DC voltage detection circuit 378 is output to the central control unit 366 as an analog voltage signal. In the central control unit 366, the output A is A / D converted and processed as a digital value.
  • FIG. 11 is a block diagram showing a detailed configuration of the central control unit 366 of the inverter device according to Embodiment 3 of the present invention.
  • the component constituting the central control unit 366 is often a one-chip microcomputer.
  • the configuration including the outer portion of the central control unit 366 in FIG. 10 may be realized by software of one microcomputer.
  • signals Iua, Iva, and Iwa corresponding to the three-phase currents Iu, Iv, and Iw are input to the first coordinate conversion unit 380 together with the calculated phase ⁇ signal.
  • conversion to Id and Iq is performed using (Equation 3), that is, conversion from stationary coordinates to rotation coordinates is performed, and Id and Iq are output.
  • Subtraction units 381 and 382 are provided, and the error between the set values Idr and Id and the error between the set values Iqr and Iq are calculated, respectively.
  • the outputs of the subtracting units 381 and 382 are input to error amplifying units 383 and 384 for applying a gain of PI (proportional and integral).
  • the outputs Vd and Vq are input to the second coordinate conversion unit 388 together with the phase ⁇ signal, and are converted from the dq coordinates to the values of the three-phase voltage command values Vu, Vv, and Vw using (Equation 4). Done.
  • the voltage command values Vu, Vv, and Vw are input to the PWM unit 389, and a triangular carrier wave having a period of 64 ⁇ s is applied at a ratio of the three-phase voltage command value to the A signal.
  • the PWM unit 389 generates upper and lower drive signals S1 to S6 by adding an instantaneous value comparison with the carrier wave and a dead time to the voltage command values Vu, Vv, and Vw.
  • the current detector 359 is configured to detect all three phases of current. However, if the current of two phases in the three-phase windings 342, 343, and 344 of the electric motor 349 is detected, the remaining one phase can be calculated according to Kirchhoff's law. Therefore, only two-phase detection may be performed.
  • the speed estimation unit 390 stores parameters (resistance value, maximum inductance, minimum inductance) of the electric motor 349, and uses the voltage equation of the electric motor 349 to estimate the speed of the electric motor 349 without a speed sensor.
  • the speed estimation unit 390 receives the outputs Id and Iq of the first coordinate conversion unit 380 and the inputs Vd and Vq of the second coordinate conversion unit 388, and outputs estimated speeds ⁇ and ⁇ 2.
  • the speed estimation unit 390 calculates ⁇ corresponding to the phase error from the voltage value and current value of the electric motor 349. Error amplification having an integral or proportional integral element is performed and fed back so that ⁇ converges to zero.
  • the integrator 392 receives the output ⁇ 2 of the speed estimation unit 390, integrates ⁇ 2 over time, and outputs a phase ⁇ signal that is reset to zero when 2 ⁇ is reached.
  • the central control unit 366 further includes a subtraction unit 394, an error amplification unit 395, an Idr setting unit 396, a short circuit brake control unit 398, and a sequence generation unit 399.
  • the subtraction unit 394 calculates the difference between the speed setting values ⁇ r and ⁇ .
  • the error amplifying unit 395 applies a gain of PI (proportional, integral) to the output of the subtracting unit 394.
  • the Idr setting unit 396 determines a set value Idr from the calculated speed ⁇ .
  • the sequence generator 399 generates a speed set value ⁇ r and a brake request signal BRQ.
  • Sequence generator 399 transmits and receives various signals to and from external components in order for the inverter device to operate as a washing machine.
  • the various signals include a stop button signal Sstop, a water supply valve signal Skb, a drain valve signal Shb, a lid lock signal Srk, a lid closing signal Scl, and the like.
  • the sequence generator 399 transmits and receives various signals related to the operation of the electric motor 349.
  • the switching unit 400 receives the signal Ka from the sequence generation unit 399 after the speed of the drum 346 becomes substantially zero during braking, and switches each contact from a to b. Thereby, the switching unit 400 switches the set value Idr, the set value Iqr, and the phase ⁇ values to the outputs Idr0, Iqr0, and ⁇ 0 of the signal generator 401.
  • the short-circuit current determination unit 403 sets the Cs signal to high when all the absolute values of the instantaneous values of the current signals Iua, Iva, and Iwa for three phases in the short-circuit state are less than 0.6A.
  • FIG. 12 is a block diagram of the short-circuit brake control unit 398 of the inverter device according to Embodiment 3 of the present invention.
  • the short circuit brake control unit 398 includes a function generator 405, an integrator 406, and a delay unit 407.
  • the integrator 406 when the INTEG is low, the integral value Duty is zero, which is the initial value.
  • the time integration operation is started from the point when INTEG rises to high, whereby Duty is output.
  • the duty that is the output of the integrator 406 is used as the input of the function generator 405.
  • the integrator 406 has a built-in function to limit the duty by an upper limiter that is limited by 100%. By this limiting operation, the duty finally reaches a peak at 100% which is the upper limit value, and at that stage, the PWM shifts to the beta-on state.
  • the voltage drop of the IGBT and the diode in the low potential side switching elements 354, 355, and 356 and the voltage drop due to the wiring from the inverter circuit 357 to the motor 349 are the motor 349.
  • an input voltage for example, about 2 to 3 V remains.
  • Such a voltage is considered to be a category of approximately zero.
  • FIG. 13 is a graph showing input / output characteristics of the function generator 405 of the inverter device according to the third embodiment of the present invention.
  • the horizontal axis represents input and the vertical axis represents output. Since the output of the function generator 405 is an input of the integrator 406, it has the meaning of the short circuit time ratio expansion rate dDuty / dt.
  • a function of the increasing speed dDuty / dt with respect to the Duty is calculated instead of counting the time from the start.
  • a straight line or a stepped line may be used instead of the curve shown in FIG. Thereby, the burden of calculation in the microcomputer can be reduced.
  • the short-circuit brake control unit 398 stops the electric motor 349 in a brake state when some abnormality occurs in the washing machine and at the time of the break of operation.
  • the short-circuit brake controller 398 gradually sets the input of the electric motor 349 to a short-circuit state. That is, the gate voltages of the switching elements 351, 352, 353, 354, 355, and 356 in the inverter circuit 357 are controlled so that the voltage between the three-phase input terminals becomes substantially zero.
  • FIG. 14 is a diagram showing an internal configuration of an inverter device called a drum type washing machine according to Embodiment 3 of the present invention as viewed from the side.
  • the drum 346 for storing the clothing 345 is rotated by the power transmitted from the electric motor 349 to the pulley 410 via the belt 348.
  • An inverter circuit 357 that supplies a three-phase alternating current to the electric motor 349 is controlled by the control unit 358.
  • the drum 346 rotates inside the resin receiving tube 411. Opening and closing of the water supply valve 413 and the drainage valve 414 is controlled by a water supply valve signal Skb and a drainage valve signal Shb from the control unit 358. Thus, water is supplied and drained into the receiving tube 411, and washing and dehydration are performed together with a separately supplied detergent.
  • a lid 416 that can be opened and closed is provided in front of the drum 346.
  • the lid 416 is provided with a handle 417 for the user to open and close the lid 416.
  • the lid 416 is closed, and the safety of the user and the scattering of water are prevented.
  • the lid 416 is partially made of transparent glass, and the washing state in the drum 346 can be seen even during the washing operation.
  • the state where the lid 416 is opened by the operation of the handle 417 is indicated by a broken line.
  • the lid 416 opens and closes around a hinge portion connected to the main body.
  • a sliding door configuration, a folding configuration, a shutter configuration, or a configuration that can be detached from the main body may be used.
  • the lid lock unit 419 holds the lid 416 in a closed state.
  • the lid lock unit 419 includes a solenoid 420, a plunger 421, a spring 422, and a lock control circuit 423. In the illustrated state where the solenoid 420 is not energized, the lid 416 is in a locked state. Therefore, even if the user pulls the handle 417 or performs any other operation, the lid 416 cannot be opened.
  • the lock control circuit 423 energizes the solenoid 420 by the lid lock signal Srk from the control unit 358 to release the lock. Once unlocked, the user can pull handle 417 to open lid 416.
  • the lid detection switch 425 detects the open / closed state of the lid 416.
  • the lid closing signal Scl becomes low and is transmitted to the control unit 358. From the aspect of ensuring safety, AC current is not supplied from the inverter circuit 357 to the electric motor 349. Therefore, the drum 346 does not rotate.
  • the lid lock unit 419 releases the locked state by energizing the solenoid 420. As a result, the user can open the lid 416.
  • the stop button 426 As for the case where the dehydration operation is stopped, in addition to the case where the predetermined dehydration time has been reached, the user operates the stop button 426, the stop button 426 generates a stop button signal Sstop, and an abnormality such as an overload. This is the case. In any case, an abnormal signal in the control unit 358 is generated, the electric motor 349 is braked, and the drum 346 is stopped. When the drum 346 is stopped, a stop determination is made by the brake request signal BRQ of the control unit 358, and then the lid lock unit 419 releases the locked state. When the locked state is released, the user can open the lid 416 by pulling the handle 417.
  • FIG. 15 is an operation waveform diagram when the brake request signal BRQ of the inverter device according to the third embodiment of the present invention causes a short-circuit brake.
  • (a) shows the brake request signal BRQ
  • (b) shows the K signal
  • (c) shows the Duty.
  • the brake request signal BRQ of the central control unit 366 becomes high at time T1 from the power running period, and at the same time, the K signal changes from high to low. Since Duty is zero at this time, the IGBT portions of the switching elements 351, 352, 353, 354, 355, and 356 move to an all-off period Td1 of 5 ms in which all of them are turned off.
  • the ratio (Duty) of the ON time of the low potential side switching elements 354, 355, and 356 shown in (c) is a short circuit time ratio. Subsequent to the all-off period, T2 to T3 become a short circuit time ratio expansion period in which the duty increases. On the other hand, the high-potential side switching elements 351, 352, and 353 are kept off by the action of the switching unit 369.
  • the expansion speed of the short circuit time ratio (Duty) during the short circuit time ratio expansion period decreases with time, and decreases as the short circuit time ratio approaches 100%.
  • the input voltage of the motor 349 is positive / negative as the induced electromotive force generated by the rotation repeats as an instantaneous value, but it is forced to zero during the short circuit time, and the absolute value is suppressed.
  • the short-circuiting time ratio expansion period from T2 to T3 is a voltage reduction period in which the switching elements 354, 355, and 356 are controlled so that the absolute value of the voltage decreases as the short-circuiting time increases.
  • the short circuit time ratio Duty becomes maximum, that is, 100%, and the short circuit braking period in which the kinetic energy of the load is absorbed is entered.
  • the voltage drop of the IGBT and the diode in the low potential side switching elements 354, 355, and 356 remains as an input voltage of the electric motor 349, for example, about 2 to 3V.
  • the voltage drop due to the wiring from the inverter circuit 357 to the electric motor 349 is also equivalent. However, such a voltage is considered to be a substantially zero category, that is, a short circuit.
  • the expansion rate dDuty / dt of the short circuit time ratio is gradually decreased.
  • the speed condition of the electric motor 349 at the time of entering the short-circuit braking period is varied over a wide range, a transient current jump can be prevented.
  • the duty enlargement speed near T2 Under the condition where the speed is high, the duty enlargement speed near T2 can be designed, and under the condition where the speed is low, the duty enlargement speed near T3 can be designed.
  • the short circuit time ratio expansion rate dDuty / dt in the vicinity of T3, which is the latter half of the short circuit time ratio expansion period can be minimized. This can be achieved by designing the transient current jump under medium to low speed conditions within an acceptable range.
  • FIG. 16 is an operation waveform diagram of the inverter device according to the third embodiment of the present invention.
  • FIG. 16 shows operation waveforms before and after the electric motor 349 and the drum 346 as a load are stopped after a further time has elapsed from the period shown in FIG.
  • (a) is the speed of the drum 346
  • (b) is the current waveform of Iu, Iv, and Iw
  • (c) is an operation waveform diagram showing the Cs signal output from the short-circuit current determination unit 403.
  • (D) is an operation waveform diagram showing a K signal which is an input signal to the switching unit 369
  • (e) is a lid lock signal Srk inputted to the lid lock unit 419.
  • the electric motor 349 in the short-circuit braking state gradually decreases in speed, and at the same time, the frequency of the line current decreases approximately in proportion to the speed.
  • the amplitude of the line current also eventually decreases and converges to zero when the speed becomes zero.
  • the output of the current detection unit 359 in the case of zero current is about 2.5 V, which is almost in the middle of the 5 V power supply.
  • the values when the switching elements 354, 355, and 356 before the start of operation are turned off are stored as offset values corresponding to zero current, used, and handled by the absolute values of the line current of each phase. .
  • the time from when the short-circuit brake is entered to when it is stopped depends on the speed of the electric motor 349 and the moment of inertia of the load when the short-circuit brake is entered. It also depends on the inductance and resistance value of the electric motor 349, the voltage (VCE (SAT)) when the switching elements 354, 355, and 356 are turned on. Since the time from when the short-circuit brake is entered to when it stops is not a fixed time, the current value, which is a physical phenomenon that appears due to the decrease in speed, is used in this embodiment to reduce the speed to a sufficiently low speed. Detects the state that has occurred.
  • the Cs signal is set to high at time T1 when the absolute values of the instantaneous values of the three line currents Iu, Iv, and Iw all fall below 0.6A.
  • the speed of the drum 346 is reduced to about 7 r / min.
  • the short-circuit brake control unit 398 sets the K and Ka signals to high at time T2 when a delay time of 0.15 seconds has elapsed after receiving the Cs signal that has become high at T1.
  • the states of the switching unit 369 and the switching unit 400 are changed to enable the on / off control of the six stone switching elements 351, 352, 353, 354, 355, and 356.
  • controlled currents are supplied from the DC power supply 374 to the windings 342, 343, and 344 of the electric motor 349 in a form in which Idr0, Iqr0, and ⁇ 0 from the signal generator 401 are effectively operated.
  • control unit 358 controls the switching elements 351, 352, 353, 354, 355, and 356 so as to supply current from the DC power supply 374 to the windings 342, 343, and 344.
  • the outputs Idr0, Iqr0, and ⁇ 0 of the signal generator 401 are all 0 at the time T2, but only Idr0 becomes 3A at T3 when 20 ms elapses, and this continues for 300 ms.
  • the lid lock signal Srk is sent high from the control unit 358 to the lid lock unit 419.
  • the lid lock unit 419 is energized to the solenoid 420, and the user can open the lid 416.
  • an instruction from the sequence generation unit 399 may move to the next process necessary as a washing machine.
  • FIG. 17 is a flowchart when the brake is applied when the dehydrating operation or the like is completed and in the middle according to the third embodiment of the present invention.
  • step S430 when the brake operation start is started (step S430), the process proceeds to the short circuit brake (BRQ) (step S431), and as described in FIG. 15, the short circuit braking period starts after the voltage reduction period.
  • BRQ short circuit brake
  • step S434 when it is determined that the deceleration has progressed to a speed close to the stop, the process proceeds to current supply (step S434).
  • the absolute values of the line currents of all phases of U, V, and W all exceed 0.6A.
  • step S435 When the current control is valid, it is determined whether or not the absolute value of the line current exceeds 0.6 A (step S435). If YES, the process proceeds to unlocking (step S437), where the solenoid 420 is energized and the user can open the lid 416.
  • the operation shown in FIG. 17 is performed once even when the power of the inverter device is turned on. For example, even when braking of the previous operation is not completed, if there is still rotation in the drum 346, in order to avoid the danger of the user as much as possible, the user cannot open the lid 416. The state of the lid lock part 419 is maintained.
  • the control unit 358 can be realized with a simple program configuration. Also for the current at the final stage of the short-circuit braking period, the absolute current value is handled using the output value of the current detection unit 359 in the correct zero current state as an offset value. Therefore, for example, when a failure occurs in the current detection unit 59 during the short-circuit braking, there is a high possibility that the output signal is fixed regardless of the actual current value such as 0V or 5V. In that case, the possibility that the Cs signal becomes high is extremely low, and high safety is ensured.
  • the switching elements 351, 352, 353, 354, 355, and 356 are controlled so as to supply current from the DC power supply 374 to the windings 342, 343, and 344.
  • the disconnection of the wiring is determined depending on whether or not the current supply is made effective. For this reason, even if a disconnection occurs during the short-circuit braking period, the user cannot open the lid 417 of the lid lock portion 419. Therefore, safety is ensured.
  • the current value to the electric motor 349 in the current supply period exceeds 0.6 A in all the windings 342, 343, and 344, but may be less than that. If the current is equal to or higher than the minimum resolution of the current detector 359, the current control is effectively established. When there is no disconnection or the like of the wiring, the current detection unit 359 has a reaction, so that a difference between when the disconnection occurs and when it is normal can be detected. Thereby, judgment from the applied voltage during current control can also be used together.
  • the period should be further increased or the current value should be further increased. Is required.
  • the positioning operation it is not essential that the positioning operation be performed, and it is sufficient if it is possible to determine whether or not a disconnection failure has occurred simply by whether or not current control works effectively. Even in the case where the positioning operation is performed reliably, the energization of the DC current for 1 second or more leads to a prolonged operation time and a waste of resources due to electric energy consumption.
  • the length and current value of the current supply period used in the present embodiment are relatively small values exceeding 300 ms and 0.6 A, respectively. Therefore, the rotation of the drum 346 by the torque generated immediately after the start of the current supply period. Is suppressed to 1 rotation or less per minute.
  • the current in the state where the input of the electric motor 349 is short-circuited is sufficiently small, and it is confirmed whether or not there is a disconnection when it is almost stopped.
  • the positioning operation that is, the operation for setting the phase difference between the generated DC magnetic field and the d axis to a sufficiently small value is not necessarily required. Therefore, by setting the current supply period to a minimum period of 500 ms or less, no new movement of the drum 346 occurs during that period. Therefore, it is possible to determine a stop in a short time, and it is possible to realize a high-quality inverter device that does not waste or move.
  • the torque for positioning increases as the current value increases.
  • the torque product product of generated torque and time
  • the movement (angular acceleration) of the new drum 346 due to the torque product is suppressed to a negligible level.
  • the kinetic energy generated in the current supply period due to friction of the bearing of the drum 346 and the like is absorbed in a very short time, and the drum 346 is stopped. Therefore, it is possible to more reliably determine the presence / absence of disconnection based on the current value that greatly exceeds the minimum resolution of the current detection unit 359. Therefore, a high-quality inverter device can be realized in a short time without wasteful movement.
  • the inverter device of the present embodiment is effective from the viewpoint of ensuring the safety of the user and the quality.
  • the rotation axis of the drum 346 is horizontal, but it may be vertical or oblique.
  • the power transmission path for rotationally driving the drum 346 is also shown using the pulley 410 and the belt 348.
  • gears may be used, or a motor provided directly on the shaft of the drum 346 and rotated at the same speed as called direct drive may be used.
  • the configuration of the lid lock portion 419 is not limited to the configuration described in this embodiment.
  • a plurality of lid lock portions may be provided.
  • a first lid lock unit that can be unlocked at any time by a user's handle operation and a second lid lock unit that is unlocked by a signal from the control unit may be used in combination.
  • the steering wheel operation may be disabled by a signal from the control unit. In any case, it is sufficient that the user can change whether or not the user can open the lid by a signal from the control unit.
  • the control unit 358 supplies current to the windings 342, 343, and 344 from the DC power source 374 after the speed of the drum 346 becomes substantially zero during braking of the electric motor 349.
  • the switching elements 354, 355, and 356 are controlled so as to be supplied.
  • the lid 417 can be opened by the lid lock portion 419. Thereby, safety can be ensured with a simple configuration.
  • control unit 358 switches the switching elements 354, 355, and the like so that the output of the current detection unit 359 becomes a predetermined value after the speed of the drum 346 becomes substantially zero during braking. 356 is controlled. Then, the lid 417 can be opened by the lid lock portion 419. Thereby, safety can be ensured with a simple configuration.
  • the lid lock unit 419 causes the lid to be closed. The state where 417 cannot be opened is continued. Thereby, safety can be ensured with a simple configuration.
  • FIG. 18 is a block diagram of central processing unit 440 of the inverter device according to Embodiment 4 of the present invention.
  • the control unit 440 includes a short circuit brake control unit 441, a sequence generation unit 442, a switching unit 443, and a signal generator 444.
  • the input signals Vd, Vq, and ⁇ of the second coordinate converter 388 are switched to Vd0, Vq0, ⁇ 0 from the signal generator 444.
  • the input signal ⁇ of the first coordinate conversion unit 380 is switched to ⁇ 0 from the signal generator 444.
  • a predetermined voltage is applied to the electric motor 349.
  • FIG. 19 is an operation waveform diagram of the inverter device according to the fourth embodiment of the present invention.
  • FIG. 19A shows the speed of the drum 346
  • FIG. 19B shows the current waveforms of Iu, Iv, and Iw
  • FIG. 19C shows the Cs signal output from the short-circuit current determination unit 403.
  • (d) shows a K signal as an input signal to the switching unit 369
  • (e) shows a lid lock signal Srk inputted to the lid lock unit 419.
  • This embodiment is different from the first embodiment in the operation after time T3.
  • the length of the current supply period is as short as 20 ms.
  • the current value is set to a value slightly exceeding 0.6 A, which is close to the lower limit that can be detected without causing a noise problem in the current detection unit 359.
  • FIG. 20 is a flowchart in the case where the brake is applied when the dehydrating operation or the like is completed and in the middle in the fourth embodiment of the present invention.
  • step S450 when the brake operation starts (step S450), the process proceeds to the short circuit brake (BRQ) (step S451), and as described in FIG. 15, the short circuit braking period starts following the voltage reduction period.
  • BRQ short circuit brake
  • step S454 when it is determined that the deceleration has progressed to a speed close to the stop (step S452), the process proceeds to voltage supply (step S454).
  • the Kb signal becomes high, and for a period of 20 ms, a positive voltage is applied to the U terminal and a negative voltage common to both the V and W terminals is applied from the DC power supply 374 through the switching elements 351, 352, 353, 354, 355, and 356.
  • step S455 in the current value determination, whether or not the minimum value of each phase of the peak of the absolute value of the line current for 20 ms is compared with the threshold value of 0.6 A (step S455). Judgment is made. In the case of reaching, the process moves to unlocking (step S457), where the solenoid 420 is energized and the user can open the cover 416.
  • step S458 the user is informed that an error has occurred while maintaining the state where the user cannot open the lid 416, and the user's safety. Is secured.
  • settings may be made with U, V, and W phase voltage values. Although it is a simple structure, when it is disconnected, it can be reliably determined that no current flows.
  • the torque product (product of torque and time) generated during the current supply period becomes small.
  • the angular velocity 1 rad is very small, one revolution or less per minute. Thereby, it stops in about 100 ms due to friction of a bearing or the like.
  • the inverter device can eliminate such a sensation and can realize an excellent inverter device in terms of quality.
  • the speed of the drum 346 is less than one revolution per minute after the speed of the drum 346 becomes substantially zero during braking. Thereby, high safety of the user can be realized.
  • FIG. 21 is a diagram showing operation waveforms of respective parts before and after the current supply period to the electric motor 349 after the speed of the drum 346 becomes substantially zero during braking in the fifth embodiment of the present invention.
  • (a) shows currents Iu, Iv, Iw supplied to the windings 342, 343, and 344 of the electric motor 349
  • (b) shows the Cs signal
  • (c) shows the K signal.
  • the waveform of the current supplied from the inverter circuit 359 to the electric motor 349 is different, but the other parts are the same as those in the third and fourth embodiments.
  • a belt 348 is used as a power transmission path between the electric motor 349 and the drum 346.
  • T3 to T4 are set to 500 ms in the current supply period, and the supply current is increased. Thus, even when the clothes 345 are in the drum 346, the positioning operation at the time T4 is reliably completed. The operation after T4 will be described below.
  • FIG. 22 is a diagram showing the phases of the permanent magnets 340 and 341 of the electric motor 349 when the belt 348 according to the fifth embodiment of the present invention is normal and when the belt 348 is disconnected (or disconnected).
  • (a) is a phase at time T4
  • (b) and (c) are phases at time T6
  • (d) and (e) are phases at time T8.
  • the number of permanent magnets 340 and 341 is the number of poles, in FIG. 22, a two-pole machine is used, and the mechanical angle and the electrical angle are equally easy to understand. Actually, it may be 4 poles, 6 poles, 8 poles, or the like.
  • the equivalent moment of inertia of the drum as viewed from the motor 349 axis is a value obtained by dividing the moment of inertia Jd at the axis of the drum 346 by the square of the pulley reduction ratio.
  • the value is considerably larger than Jm. That is, the difference due to the presence or absence of the belt 348 is very large.
  • the positioning operation in which the drum 346 is rotated by the belt 348 is effectively performed even if the belt 348 is normal.
  • the current supply time and the current value are set to values that do not allow positioning when the belt 348 is present.
  • the current is supplied again for a very short period of 2 ms with the same phase as the T3 to T4 period.
  • the inductance value L is obtained from (Equation 5) from the relationship between the current rising speed dI / dt and the voltage V during this period.
  • T7 to T8 is a final current supply period before the lid lock unit 419 is released (a state in which the user can open the lid 417).
  • the belt 348 is normal and the wiring to the electric motor 349 is not broken. Further, it can be detected that all paths from the inverter circuit 359 to the drum 346 are normal and in a stopped state. If they are not satisfied, it is determined that a failure in the power transmission path, that is, a belt 348 breakage is detected. As a result, the lid lock unit 419 continues to be in a state where the user cannot open the lid 417. Therefore, an inverter device with higher safety can be realized.
  • the current supply for obtaining the inductance L is a current source that is current controlled.
  • the present invention is not limited to the current source.
  • a calculation may be performed by applying a predetermined voltage V and calculating from the magnitude of current or the rate of increase in current (dI / dt).
  • a short-time current is intermittently supplied or a weak current is continuously supplied while changing the phase and current value with time. You may do it. If the current or voltage is supplied so that the drum 346 and the electric motor 349 hardly rotate at least when the belt 348 is in a normal state, it is effective to investigate the direction of the d-axis and the q-axis.
  • the rotor position using the mutual inductance is determined from the voltage and current values of components that are electrically shifted by 90 degrees with respect to the supplied voltage and current phase. It does not matter.
  • the belt 348 since the belt 348 is used as a power transmission path, it is slightly disadvantageous in terms of reliability such as belt detachment and belt breakage as compared with other types of power transmission paths.
  • the configuration of the present embodiment that appropriately detects belt detachment is highly effective.
  • the washing machine has the power transmission path 348 between the electric motor 349 and the drum 346, and the control unit 358 causes the electric motor after the speed of the drum 346 becomes substantially zero during braking.
  • the control unit 358 causes the electric motor after the speed of the drum 346 becomes substantially zero during braking.
  • FIG. 23 is a diagram illustrating operation waveforms of respective parts before and after a current supply period to the electric motor 349 after the speed of the drum 346 becomes substantially zero during braking in the inverter device according to the sixth embodiment of the present invention.
  • the mechanism anti-resonance frequency in the electric motor 349 shaft is calculated as follows. That is, mainly due to the torsion spring constant K [Nm / rad] at the shaft of the electric motor 349 due to the elasticity of the belt 348 in the longitudinal direction and the moment of inertia Jm [kg square meter] of the electric motor 349.
  • the mechanism anti-resonance frequency in the electric motor 349 axis that is, the resonance frequency f at which the angular velocity and the angular acceleration with respect to the torque are maximized is calculated by (Equation 6) of simple vibration.
  • the angular velocity (speed) and torque (force) of the mechanical system are replaced with the voltage and current of the electric system, respectively, so that the impedance becomes a maximum frequency, so the expression of the mechanical anti-resonance frequency is also correct.
  • resonance and anti-resonance are combined and described as resonance.
  • the mechanism anti-resonance frequency is included in the mechanism resonance frequency.
  • this vibration mode is different from that generated when a belt used for measuring the tension of the belt 348 is played as a string.
  • This vibration mode is determined by the rigidity (reciprocal of elasticity) due to the belt 348 extending and contracting in the length direction, the length of the belt tension, the radius of the pulley portion on the motor 349 side, and the pulley portion. In this embodiment, it is 55 Hz.
  • the anti-resonance frequency f is substantially constant under the condition that the moment of inertia Jd of the drum 346 is large to some extent.
  • the moment of inertia Jd of the drum 346 alone with respect to the anti-resonance frequency f is 0.3 [kg square meter], the influence of the clothing 345 and water as contents is relatively small.
  • the frequency of the supplied current is changed to 30 to 80 Hz in the current supply period T10 to T11.
  • the current supplied to the electric motor 349 does not generate a unidirectional torque, but generates a positive and negative alternating torque.
  • the frequency includes a component of 55 Hz which is a mechanism resonance frequency by the electric motor 349, the belt 348, and the drum 346. Therefore, the electric motor 349 serving as the prime mover of the drum 346 generates an alternating torque in the frequency range including the mechanical resonance frequency and before and after that.
  • the alternating torque generated in the electric motor 349 due to the alternating current supplied between the VWs is a solid line when there is a maximum point R of the voltage absolute value
  • the maximum point R is different from the broken line when the belt 348 is detached. Therefore, it is determined that the belt 348 is in a normal state by detecting the presence of the R point.
  • an alternating torque of the resonance frequency component of the mechanical element including the prime mover is generated in the electric motor 349 serving as a prime mover for rotationally driving the drum 346 serving as a load via the belt 348.
  • induced electromotive force of the permanent magnets 340 and 341 that is substantially proportional to the magnitude of vibration (speed amplitude) is generated in the windings. Therefore, the presence / absence of the belt 348 is determined from the presence / absence of the mechanism resonance frequency by detecting the amplitude of vibration of the motor 349 serving as the prime mover based on the amplitude of the input voltage of the motor 349.
  • the drum 346 since the current frequency is particularly set to 30 to 80 Hz, the drum 346 does not generate a new motion for detection as the movement of the drum 346 during the current supply period. Therefore, even in the vicinity of the drum 346, it can be suppressed to a very small vibration of 0.1 mm or less. Further, even if the user looks at the drum 346 through the cover 417 having transparent glass, the user does not feel distrust or anxiety, and the quality is extremely high. Even when the belt 348 is detached or cut, the abnormality can be detected with high accuracy. Therefore, it can be firmly confirmed that the drum 346 is completely stopped, and an extremely safe inverter device can be secured.
  • the present embodiment is convenient because the drum 346 does not start to move to determine whether the belt 348 is normal.
  • the user can open the cover 417 when the drum lock 346 is completely stopped in the state of the cover lock unit 419. Therefore, safety can be ensured.
  • a position sensor such as a Hall IC is not provided, and a configuration called “sensorless” is adopted. Therefore, it is possible to obtain various effects such as low cost and elimination of influence due to position variation of the position sensor. After that, the disconnection of the wiring to the electric motor 349 is detected, and an abnormality such as detachment of the power transmission path (belt) 348 is also detected. Thereby, a highly safe inverter device is realized in which the user opens the lid 417 in a state where the drum 346 is reliably stopped.
  • the anti-resonance frequency at which the mechanical impedance (angular velocity / torque) is maximized is used.
  • a resonant frequency at which the mechanical impedance (angular velocity / torque) is minimized can also be used.
  • the change in the moment of inertia of the drum 346 can be covered by changing the frequency (sweep etc.) slightly wider. Subsequently, the mass of the clothing 345 in the drum 346 may be detected, for example, the degree of dehydration may be detected.
  • the belt 348 can be removed from an inverter device having a position sensor. Therefore, it is possible to determine whether the belt 348 is detached or not with higher accuracy than a position sensor that changes a signal every 60 degrees of electrical angle that is normally used.
  • the short-circuit braking is used in the third to sixth embodiments, but electrical braking may be applied to the motor 349 by other configurations. It suffices if it is possible to detect that there is no disconnection in the path from the inverter circuit 359 to the drum 346 when the electric motor 349 stops, that there is no disconnection, and that there is no abnormality in the power transmission path. Accordingly, it is only necessary that the user can open the lid 417 in a state where the drum 346 is in a true stop state.
  • the power transmission path 348 is a belt, and the frequency of the current supplied to the electric motor during the current supply period is a mechanical resonance frequency component by the electric motor 349, the belt, and the drum 346. Is provided. Accordingly, the presence or absence of the belt can be detected with very high accuracy without applying new motion to the drum 346, and high safety can be realized.
  • FIG. 24 is a block diagram of an inverter device according to Embodiment 7 of the present invention.
  • the inverter device includes permanent magnets 500 and 501, and three-phase windings 502, 503, and 504.
  • a load (drum) 506 for housing the clothing 505 includes an electric motor 509 that is rotationally driven via a pulley 507 and a belt 508, and six stone switching elements 511, 512, 513, 514, 515, and 516.
  • an inverter circuit 517 that supplies AC currents Iu, Iv, and Iw to the electric motor 509 and a control unit 518 that controls on / off of the switching elements 511, 512, 513, 514, 515, and 516 are provided.
  • the control unit 518 includes a current detection unit 519 that detects the alternating currents Iu, Iv, and Iw.
  • the current detection unit 519 includes shunt resistors 521, 522, and 523 that convert the currents of the three phases into voltages, and an A / D converter 524.
  • the A / D converter 524 performs A / D conversion while the switching elements 514, 515, and 516 on the low potential side are on.
  • control unit 518 has a central control unit 535, and performs signal generation for controlling the inverter circuit 517 and reception of output signals Iua, Iva, and Iwa signals from the current detection unit 519 in a digital manner.
  • the PWM circuit 536 receives the duty from the central control unit 535, and outputs a signal B obtained by performing pulse width modulation (PWM) with a triangular wave having a period of 64 microseconds on the duty.
  • Signals S1 to S6 of the central control unit 535 provide gate signals of the switching elements 511, 512, 513, 514, 515, and 516 via the switching unit 537 and the drive circuit 538 provided between the central control unit 535 and the inverter circuit 517.
  • the K signal of the central control unit 535 is high, the switching unit 537 is in the state shown in FIG. 24 and S1 to S6 are adopted.
  • each switch in the switching unit 537 is connected to the lower side.
  • the inverter circuit 517 is supplied with a DC voltage VDC from a DC power supply 544 constituted by an AC power supply 541 of AC 230 V 50 Hz, a full-wave rectifier 542 and a capacitor 543.
  • An output A of the DC voltage detection circuit 548 configured by the resistors 546 and 547 is input to the central control unit 535 as an analog voltage signal. Inside the central control unit 535, this is also processed as an A / D converted digital value.
  • FIG. 25 is a block diagram showing a detailed configuration of the central control unit 535 of the inverter device according to the seventh embodiment of the present invention.
  • the component constituting the central control unit 535 is often a one-chip microcomputer.
  • the configuration including the portion outside the central control unit 535 in FIG. 24 may be realized by software of one microcomputer.
  • signals Iua, Iva, Iwa corresponding to the three-phase currents Iu, Iv, Iw are input to the first coordinate conversion unit 550 together with the estimated phase ⁇ signal.
  • conversion to Id and Iq is performed using (Equation 7), that is, conversion from stationary coordinates to rotation coordinates is performed, and Id and Iq are output.
  • Subtraction units 551 and 552 are provided, which calculate the error between the set values Idr and Id and the error between the set values Iqr and Iq, respectively.
  • the outputs of the subtracting units 551 and 552 are input to error amplifying units 553 and 554 that apply a PI (proportional and integral) gain.
  • the outputs Vd and Vq are input to the second coordinate converter 558 together with the phase ⁇ signal that is the output of the integrator 555, and the three-phase voltage command values Vu, Vv, Conversion to the value of Vw is performed.
  • the voltage command values Vu, Vv, and Vw are input to the PWM unit 559, and a triangular carrier wave having a period of 64 ⁇ s is applied at a ratio of the three-phase voltage command value to the A signal.
  • Voltage command values Vu, Vv, Vw are subjected to instantaneous value comparison with the carrier wave and added with dead time to generate upper and lower drive signals S1 to S6.
  • the current detector 519 is configured to detect all three phases of current. However, if the current of two phases in the three-phase windings 502, 503, and 504 of the electric motor 509 is detected, the remaining one phase can be calculated according to Kirchhoff's law. Therefore, only two-phase detection may be performed.
  • the central control unit 535 of the present embodiment further includes a subtraction unit 560 that calculates the difference between the speed setting values ⁇ r and ⁇ , and an error that causes the gain of PI (proportional, integration) to act on the output of the subtraction unit 560. And an amplifying unit 561.
  • an Idr setting unit 562 that determines a set value Idr from the estimated speed ⁇ and a short-circuit brake control unit 563 are provided. Further, it includes an abnormality detection unit 565 and a sequence generation unit 567 that generates a set speed ⁇ r when the electric motor 509 is driven.
  • the abnormality detection unit 565 outputs an abnormality detection signal B99RQ when there is some abnormality in the inverter device, for example, overcurrent or overvoltage of each unit or excessive vibration.
  • the sequence generation unit 567 generates a brake request signal B4RQ when stopping the electric motor 509 in a braking state at the time of the break of operation as a washing machine such as washing and dehydration.
  • the switching elements 511, 512, 513, 514, 515, and 516 in the inverter circuit 517 are set so that the input of the electric motor 509 is gradually short-circuited, that is, the voltage between the three-phase input terminals becomes substantially zero.
  • Control That is, the gate control is performed on the low potential side switching elements 514, 515, and 516 in the inverter circuit 517 with a duty common to three stones, and the high potential side switching elements 511, 512, and 513 are kept off.
  • the short-circuit current determination unit 570 sets the Cs signal to high when all the absolute values of the instantaneous values of the three-phase current signals Iua, Iva, and Iwa in the short-circuit state are less than 0.6A.
  • the Idr setting unit 562 outputs 0A as the set value Idr when the ⁇ value is 400 r / min or less in terms of speed of the load (drum) 506, and exceeds 400 r / min in terms of speed of the load (drum).
  • the weak magnetic field control is applied.
  • the speed estimation unit 556 stores the parameters (resistance value, maximum inductance, minimum inductance) of the electric motor 509, and estimates the speed of the electric motor 509 without the speed sensor. At this time, the voltage equation of the electric motor 509 is used.
  • the speed estimation unit 556 receives the outputs Id and Iq of the first coordinate conversion unit 550 and the inputs Vd and Vq of the second coordinate conversion unit 558, receives the estimated speed ⁇ , and the estimated speed ⁇ 2 that is input to the integrator 555. Is output.
  • Speed estimation section 556 calculates ⁇ corresponding to the phase error from the voltage value and current value of electric motor 509.
  • the speed estimator 556 is configured by a feedback system in which error amplification having an integral or proportional integral element is performed so that ⁇ corresponding to the phase error converges to zero.
  • FIG. 26 is a block diagram of the short-circuit brake control unit 563 of the inverter device according to Embodiment 7 of the present invention.
  • the short-circuit brake control unit 563 includes an OR circuit 574 that obtains a logical sum of the brake request signal B4RQ and the abnormality detection signal B99RQ, and a comparator 575 that receives the A signal.
  • a voltage increase generation unit 576, an adder 577, and a holder 578 are included.
  • a value obtained by adding a voltage increase equivalent to 50V to the DC voltage VDC when the brake request signal B4RQ or the abnormality detection signal B99RQ becomes high is used as a threshold value from the holder 578, and the comparator 575. Is supplied to the negative input.
  • the short circuit time ratio expansion speed command unit 580 includes a function generator 581, a function generator 582, a switching unit 583, and a holder 585.
  • the short circuit time ratio expansion speed signal that is the output of the short circuit time ratio expansion speed command unit 580 is input to the integrator 586.
  • the output (brake request signal) BRQ of the OR circuit 574 is input to the delay unit 587.
  • the integral value Duty is zero, which is the initial value. Time integration is started from the point when INTEG rises to high, and Duty is output.
  • the duty that is the output of the integrator 586 is used as the input of the short circuit time ratio expansion speed command unit 580.
  • the function generators 581 and 582 function to increase the short-circuit time ratio according to the time from the start of the short-circuit time ratio expansion period, with a simple configuration in which the time count from the start of integration is omitted. The speed can be changed.
  • the condition that the output of the comparator 575 becomes high is when the threshold is exceeded due to the rise of the signal A.
  • the holder 585 holds the duty and fixes the input of the function generator 582.
  • the switching unit 583 is switched from a to b, thereafter, a constant output value from the function generator 582 becomes the short circuit time ratio expansion speed.
  • the duty in that case rises at a constant speed with time.
  • the integrator 586 has a built-in function to limit the duty by an upper limiter that is limited at 100%. Due to this limitation, the duty finally reaches a peak at 100% which is the upper limit value, and at that stage, the state shifts from PWM to a beta-on state.
  • FIG. 27 is a graph showing input / output characteristics of the function generator 581 and the function generator 582 of the inverter device according to the seventh embodiment of the present invention.
  • the horizontal axis represents input and the vertical axis represents output.
  • a solid line A indicates input / output characteristics of the function generator 581
  • a broken line B indicates input / output characteristics of the function generator 582.
  • the duty is connected as it is to the input of the function generator 581 on the horizontal axis.
  • the function generator 582 is connected to the input terminal with a holder 585 interposed therebetween.
  • the output on the vertical axis in FIG. 27 has the meaning of the short-circuit time ratio expansion rate dDuty / dt because it will be input to the integrator 586 later.
  • a function of the increasing speed dDuty / dt with respect to the Duty is provided instead of counting the time from the start.
  • a straight line or a stepped value may be used instead of the curve shown in FIG. 27, and the calculation burden on the microcomputer is reduced. You can also.
  • FIG. 28 is an operation waveform diagram when the brake request signal BRQ of the inverter device according to Embodiment 7 of the present invention causes a short-circuit brake.
  • (a) shows the brake request signal BRQ
  • (b) shows the K signal
  • (c) shows the Duty.
  • the brake request signal BRQ of the central control unit 535 becomes high at the time T1 from the power running period, and at the same time the K signal becomes low from high. Since Duty is zero at this time, all IGBT portions of switching elements 511, 512, 513, 514, 515, and 516 are off, and an all-off period of 5 ms is generated by the action of delay unit 587.
  • the on-time ratio (Duty) of the low potential side switching elements 514, 515, and 516 shown in (c) is the short-circuit time ratio. Subsequent to the all-off period, T2 to T5 become a short circuit time ratio expansion period in which the duty increases. On the other hand, the high-potential side switching elements 511, 512, and 513 are kept off by the action of the switching unit 537.
  • the time change of the short circuit time ratio Duty has a smooth curve characteristic as shown by the solid line A in FIG. Accordingly, as shown by the solid curve in FIG. 28 (c), the temporal gradient (short-circuiting time ratio expansion rate) continuously decreases with time.
  • the broken line in FIG. 28C is an example when the characteristic of the function generator 581 is stepped, and is a broken line passing through (T3, D3) and (T4, D4).
  • the expansion rate of the short circuit time ratio (Duty) decreases with time and decreases as the short circuit time ratio approaches 100%.
  • the input voltage of the electric motor 509 repeats positive / negative as an instantaneous value of the induced electromotive force generated by rotation. However, it is forced to zero during the short circuit time, and the absolute value is suppressed.
  • the switching element 514, 515, 516 is controlled so that the absolute value of the voltage is reduced by increasing the short circuit time in the short circuit time ratio expansion period from T2 to T5. It becomes a period.
  • the duty reaches 100%.
  • the electric motor 509 is in a beta-on state by the control unit 518 performing on / off control of the low-potential side switching elements 514, 515, and 516 in the inverter circuit 517.
  • the short-circuit time ratio Duty is kept at the maximum, that is, 100%, This is a short-circuit braking period that absorbs kinetic energy.
  • the motor 509 can be reduced in size and cost compared to a configuration in which the motor is directly connected to a load, which is called direct drive.
  • direct drive since the inductance tends to be small, the transient current jump increases.
  • the maximum current during operation of the inverter device may be exceeded, the need to suppress the jump of current increases.
  • the design is such that the short circuit time ratio (Duty) expansion speed in T3 to T5, which is the latter half of the short circuit time ratio expansion period, is increased within a range that allows a transient current jump under medium to low speed conditions. Thereby, an overvoltage can be suppressed to the minimum.
  • Duty short circuit time ratio
  • the output HV of the comparator 575 never goes high.
  • the operation shown in FIG. 28 is performed during short-circuit braking under any speed condition, and the switching unit 583 is always connected only to the terminal a. Therefore, the switching unit 583, the function generator 582, the holder 585, the comparator 575, the voltage increase generation unit 576, the adder 577, and the holder 578 are also unnecessary. That is, it can be omitted from the components.
  • FIG. 29 is an operation waveform diagram of the inverter device according to the seventh embodiment of the present invention.
  • the operation waveform diagram of FIG. 29 shows a case where the capacitance of the capacitor 543 is small and the short circuit brake is caused by the brake request signal BRQ from a relatively high speed operation and the increase of the DC voltage VDC is large.
  • 29A is a brake request signal BRQ
  • FIG. 29B is a duty
  • FIG. 29C is a DC voltage VDC output from the DC power supply 544
  • FIG. 29D is an output HV signal of the comparator 575.
  • the brake request signal RRQ becomes high, and during the 5 ms all-off period up to t1, when the speed of the motor 509 is high, the DC voltage VDC increases due to regeneration to the DC power supply 544 by induced electromotive force. Begins. From t1 onward, the DC voltage VDC increases further as the duty increases.
  • the value obtained by adding the output of the voltage increase generation unit 576 by the adder 577 to the VDC0 at the time t0 is held in the holder 578.
  • the output HV of the comparator 575 changes to high and enters a high voltage region.
  • the function generator 582 outputs an output corresponding to the duty 83% at that time by the action of the holder 585.
  • the contact b of the switching unit 583 is connected and input to the integrator 586. For this reason, it functions as the short circuit time ratio expansion rate dDuty / dt and is held by the holder 585. Therefore, at t3, the duty increases linearly at a constant short-circuiting time ratio expansion rate until the duty reaches 100%.
  • the configuration of the present embodiment enables a design that satisfies both overvoltage and overcurrent at any motor 509 speed.
  • the output of the HV signal as a threshold value obtained by adding 50 V to VDC0, the occurrence of overcurrent can be easily suppressed against the change in the voltage of the AC power supply 541.
  • a constant value may always be used as Vth, or an upper limit and a lower limit for Vth may be provided. As a result, there is no malfunction in the voltage change range of the AC power supply 541 used, and a design that reliably prevents overcurrent and overvoltage can be achieved.
  • the electric motor 509 called sensorless can be configured to have a low cost configuration without a position detection sensor and a speed detection sensor.
  • the short circuit brake (short circuit braking) period does not matter regardless of the phase order. Control to transition.
  • FIG. 30 is an operation waveform diagram of the inverter device according to the seventh embodiment of the present invention.
  • the operation waveform diagram of FIG. 30 shows that the inverter device becomes a short-circuit brake in response to the brake request signal B99RQ, and more time elapses from the period shown in FIGS. 28 and 29 before and after the motor 509 and the load (drum) 506 stop. Operation waveforms are shown.
  • FIG. 30A shows the load (drum) speed
  • FIG. 30B shows the current waveforms of Iu, Iv, and Iw
  • FIG. 30C shows the Cs signal output from the short-circuit current determination unit 570.
  • the speed of the electric motor 509 in the short-circuit brake state gradually decreases.
  • the frequency decreases approximately in proportion to the speed.
  • the amplitude of the line current also finally decreases and converges to become zero when the speed becomes zero.
  • the time from when the short-circuit brake is applied until it stops depends on the following parameters. That is, the speed of the electric motor 509 at the time when the short-circuit brake is entered, the moment of inertia of the load, the inductance and resistance value of the electric motor 509, the voltage (VCE (SAT)) when the switching elements 514, 515, and 516 are on. . Since the time to stop is not a fixed time, a current value that is a physical phenomenon that appears due to a decrease in speed is used in this embodiment. As a result, it is detected whether the speed has sufficiently decreased.
  • the Cs signal is set to high at a time Tja when all of the absolute values of the instantaneous values of the three line currents Iu, Iv, and Iw are less than 0.6 A. That is, the load (drum) speed is reduced to about 7 r / min.
  • the sequence generation unit 567 receives the Cs signal that has become high, the sequence generation unit 567 proceeds to the next step as a washing machine when a delay time of 0.3 seconds has elapsed.
  • the position sensor and speed sensor are not used, and a low-cost and simple sensorless configuration is used. Can be done appropriately.
  • the control unit 518 short-circuits the input terminals of the three-phase windings 502, 503, and 504 by the on / off control of the switching elements 514, 515, and 516 of the inverter circuit 517.
  • FIG. 31 is a block diagram of short circuit brake control unit 590 of the inverter device according to the eighth embodiment of the present invention.
  • configurations other than the short-circuit brake control unit 590 are the same as those in the seventh embodiment shown in FIG.
  • the OR circuit 574, the integrator 586, and the delay unit 587 are the same as those in the seventh embodiment.
  • FIG. 32 is a graph showing the characteristics of the short circuit time ratio expansion speed setting unit 592 of the inverter device according to the eighth embodiment of the present invention.
  • the horizontal axis is Duty
  • the vertical axis is the short-circuiting time ratio expansion rate dDuty / dt.
  • dDuty / dt is switched in four stages depending on the ⁇ A value input from the holder 596.
  • the operation when the short circuit brake of the inverter device of the present embodiment is entered is as follows.
  • the value of A corresponding to the DC voltage VDC at the time when the output of the OR circuit 574 becomes high is held by the holder 595.
  • INTEG becomes high, and the integrator 586 starts time integration from the initial value zero. From the condition at the left end of FIG. 32, the duty increases gradually.
  • the short circuit time ratio Duty reaches a predetermined value of 70%, the output of the comparator 600 switches from low to high.
  • the short-circuit time ratio expansion speed setting unit 592 selects the four-stage characteristics shown in FIG.
  • the characteristic that ⁇ A is large at high speed and the characteristic that ⁇ A is small at low speed is selected.
  • the inverter device of this embodiment operates reasonably. Therefore, in the inverter device of the present embodiment, although it has a relatively simple configuration, it is possible to suppress the occurrence of overvoltage and overcurrent when entering the short-circuit braking period under conditions in a wide speed range.
  • FIG. 33 is a block diagram of the short circuit brake control unit 605 of the inverter device according to the ninth embodiment of the present invention.
  • components other than the short-circuit brake control unit 605 have the same configuration as that of the seventh embodiment shown in FIG.
  • the inverter device of the present embodiment has the following configuration.
  • a delay unit 606 that outputs a signal obtained by delaying the brake request signal BRQ by 3 ms.
  • a line current detection unit 607 that calculates and outputs the maximum value among the three phases of the absolute values of the instantaneous values using the output signals Iua, Iva, Iwa of the current detection unit 519.
  • a holder 608 that holds the brake request signal BRQ at a high timing.
  • Short circuit time ratio expansion speed setting unit 610 Short circuit time ratio expansion speed setting unit 610.
  • FIG. 34 is a graph showing the characteristics of the short circuit time ratio expansion speed setting unit 610 of the inverter device according to the ninth embodiment of the present invention.
  • the horizontal axis is Duty
  • the vertical axis is the short-circuiting time ratio expansion rate dDuty / dt.
  • dDuty / dt is switched to a curve of several stages. When the output signal of the holder 608 is high, the output is large.
  • FIG. 35 is an operation waveform diagram of a portion that enters the short-circuit braking period of the inverter device according to the ninth embodiment of the present invention.
  • (a) is the short-circuit time ratio Duty
  • (b) is the load (drum) 506, and the line currents Iu, Iv, Iw, and (c) when the load 506 is relatively low at 300 revolutions per minute are the load (drum). Shows the waveforms of the line currents Iu, Iv, and Iw at a relatively high speed of 1000 revolutions per minute.
  • the induced electromotive force by the permanent magnets 500 and 501 in the electric motor 509 is low at the low speed shown in (b). For this reason, no regenerative current is generated to the DC power supply 544 during the free-run period.
  • the induced electromotive force by the permanent magnets 500 and 501 in the electric motor 509 is high at the high speed shown in FIG. For this reason, a regenerative current is generated to the DC power supply 544 during the free-run period. Therefore, there is a clear difference between low speed and high speed.
  • the design can be made such that no problem due to overcurrent and overvoltage occurs at any speed.
  • a curve is used for the characteristics shown in FIG. 34, but a step function may be used instead of the curve. Moreover, it is good also as what switches only by an electric current value irrespective of Duty.
  • the short circuit time ratio expansion rate is changed according to the magnitude of the line current at t1 within the free run period.
  • the current detection timing is not particularly limited during the free run period. After the free run period ends, it may be a point in time after the duty rise starts. A plurality of timings may be combined.
  • the line current detection unit 607 that receives the output of the current detection unit 519 detects the magnitude of the current.
  • frequency elements can also be detected. At high speed, frequency detection can be used effectively from the free run period. Even at low speeds, it is possible to detect the frequency during the short circuit time ratio expansion period.
  • FIG. 36 is a block diagram of short-circuit brake control unit 612 of the inverter device according to Embodiment 10 of the present invention.
  • parts other than the short-circuit brake control unit 612 are the same as those in the seventh embodiment.
  • the short circuit time ratio expansion speed command unit 613 receives a speed signal ⁇ from the speed detection unit 615 that detects the speed of the electric motor 509.
  • the speed detector 615 is provided in the electric motor 509, and has a Hall IC 617 that outputs high and low according to the polarity of the magnetic poles of the opposing permanent magnets 500 and 501, and a speed calculator 618 that calculates the speed from the output. is doing.
  • FIG. 37 is a graph showing the characteristics of the short circuit time ratio expansion speed command unit 613 of the inverter device according to the tenth embodiment of the present invention.
  • the horizontal axis represents a speed signal input from the speed detection unit 615
  • the vertical axis represents the short-circuiting time ratio expansion speed dDuty / dt serving as an output.
  • the output increases as the speed increases regardless of the duty.
  • the short-circuiting time ratio increases linearly up to 100% with the passage of time. Therefore, the inclination changes depending on the speed.
  • the short-circuiting time ratio expansion period is as short as about 100 ms, for example, and the speed change that occurs during that period is small, the difference from the case where a holder or the like is provided is small, and any configuration is possible. is there.
  • the speed detection unit 615 using the Hall IC 617 is used.
  • the Hall IC is not used in an electric motor drive system generally called sensorless. Instead, estimation from the input voltage and input current of the electric motor 509 is performed. Therefore, for example, by using a speed estimation signal immediately before the free-run period, a configuration in which position detection and speed detection of the Hall IC or the like are not used can be achieved.
  • the washing machine of this embodiment includes at least one of the voltage detection unit 548 that detects the voltage of the DC power supply 544, the current detection unit 519 that detects current, and the speed detection unit 615 that detects the speed of the electric motor 509. Select the detector.
  • the control unit 518 changes the expansion rate of the short circuit time ratio in the short circuit time ratio expansion period. Thereby, even if the speed condition of the electric motor 509 at the time of entering the short-circuit braking period is changed over a wide range, it is possible to prevent a transient current jump.
  • control unit 518 changes the expansion speed of the short circuit time ratio according to the time from the start of the short circuit time ratio expansion period. Therefore, even if the speed condition of the electric motor 509 at the time of entering the short-circuit braking period is changed over a wide range, it is possible to prevent a transient current jump.
  • FIG. 38 is a diagram showing an internal configuration of an inverter device called a drum-type washing machine according to Embodiment 11 of the present invention viewed from the side.
  • the inverter device has an electric motor 624 that is rotationally driven via a load (drum) 621 that houses clothing 620, a pulley 622, and a belt 623.
  • an inverter circuit 626 that supplies a three-phase alternating current to the electric motor 624 is provided.
  • the inverter circuit 626 is operated by a control signal Sd for 6 stones from the control unit 628.
  • the control signal Sd corresponds to the brake request signal B99RQ and the brake request signal B4RQ described in the seventh embodiment. After passing through the voltage reduction period, it shifts to a short circuit braking period. Further, as described in the seventh embodiment, the control signal Sd performs stop determination during the short circuit braking period.
  • the load rotates inside the resin receiving cylinder 630. Opening and closing of the water supply valve 633 and the drain valve 634 is controlled by the water valve signal Skb and the drain valve signal Shb from the control unit 628. As a result, water is supplied and drained into the receiving tube 630, and washing and dehydration are performed together with a separately supplied detergent.
  • a lid 636 that can be opened and closed is provided in front of the load (drum) 621.
  • the lid 636 is provided with a handle 637 for the user to open and close the lid 636.
  • the lid 636 is closed, and the safety of the user and the scattering of water are prevented.
  • the state in which the lid 636 is opened by operating the handle 637 is indicated by a broken line.
  • the lid lock unit 640 holds the lid 636 in a closed state.
  • the lid lock unit 640 includes a solenoid 641, a plunger 642, a spring 643, and a lock control circuit 644. In the illustrated state where the solenoid 641 is not energized, the lid 636 is in a locked state. Therefore, even if the user pulls the handle 637 or performs any other operation, the lid 636 cannot be firmly opened by the lid lock portion 640.
  • the lock control circuit 644 energizes the solenoid 641 by the lid lock signal Srk from the control unit 628. The user can open the lid 636 by releasing the lock.
  • the lid detection switch 646 detects the open / closed state of the lid 636.
  • the lid closing signal Scl becomes low and is transmitted to the control unit 628. From the aspect of ensuring safety, AC current is not supplied from the inverter circuit 626 to the electric motor 624. Therefore, the load (drum) 621 is not rotated.
  • a direct current may be supplied to the electric motor 624, and the load (drum) 621 is more reliably fixed in the rotating direction, so that sufficient safety can be ensured.
  • the lid lock signal Srk is sent to the lock control circuit 644, and the lid lock unit 640 energizes the solenoid 641.
  • the dehydration operation is stopped when the user operates the stop button 648 and the stop button signal Sstop is generated by the stop button 648 or when the inverter circuit 626 is overrun in addition to when the predetermined dehydration time is reached.
  • This is a case where an abnormality such as a load occurs and an abnormal signal Sab is generated. Any signal is input to the control unit 628, the electric motor 626 is braked, and the load (drum) 621 is stopped.
  • the controller 628 makes a stop determination, and then the lid lock unit 640 releases the locked state.
  • the lid 636 can be opened if the user pulls the handle 637.
  • FIG. 39 is a flowchart immediately after the power of the inverter device according to the eleventh embodiment of the present invention is turned on.
  • step S650 when the control unit 628 is activated, such as when the power switch of the inverter device is turned on, the microcomputer program that is configured starts (step S650).
  • step S651 The operation shifts from the start to the short-circuit brake (step S651), and the operation when the brake request signal B99RQ or the brake request signal B4RQ shown in FIG. 26 in the description of the seventh embodiment is generated is performed. to go into.
  • step S653 the solenoid 641 is energized, and the user can open the lid 636.
  • the lid 636 When the power is turned on, for example, when braking of the previous operation is not completed, if the lid 636 can be unlocked by the lid lock unit 640, the remaining rotation may cause danger to the user. May occur.
  • the lid lock unit 640 is controlled so that the user cannot open the lid 636 during operation.
  • the unlocked state that is, the user can open the lid 636 and put the hand into the drum 621. Even when the power is turned off, the lid 636 can be freely opened and closed by the user.
  • the user may not be able to open the lid 636 (locked state) when the power is turned off. Although the lid 636 is closed, it is possible that the rotation of the drum 621 remains.
  • the lid lock unit 640 In this state, when the power is turned on next time, the lid lock unit 640 immediately allows the user to open the lid 636. If the rotation of the drum 621 remains, use the lid lock unit 640. Can be at risk. In the present embodiment, there is a short-circuit braking period following the voltage reduction period after the power is turned on, and when the braking of the drum 636 is completed, the lid lock unit 640 is in a state in which the user can open the lid 636. Be controlled. Thereby, high safety is maintained.
  • a voltage reduction period and a short-circuit braking period are provided immediately after the power is turned on regardless of whether the lid lock unit 640 at the time when the power is turned on is in a locked state or an unlocked state. It is effective in terms of ensuring safety to provide a short-circuit braking period at least in the locked state. However, there is no difference in ensuring safety even when there is no voltage reduction period or short-circuit braking period when the power is turned on and the lid 636 is open when it is unlocked. . For this reason, the voltage reduction period and the short-circuit braking period immediately after power-on can be omitted.
  • the lid lock unit 640 allows the user to open the lid 636. To do. Thereby, danger can be eliminated. Therefore, a highly safe inverter device can be realized.
  • step S653 After appropriately determining the stop of the electric motor, the lock is released (step S653) so that the user can open the lid 636. Therefore, a highly safe inverter device can be realized.
  • step S651 braking by the brake request signal B99RQ or the brake request signal B4RQ is performed by the short-circuit brake (step S651).
  • the configuration is called sensorless without using a speed sensor or a position sensor, even if the rotation of the load (drum) 621 remains immediately after the power is turned on, the overcurrent and overvoltage of the inverter circuit 626 can be reduced. Can be suppressed. Therefore, the inverter device of the present embodiment is extremely effective regardless of the speed and position (phase) of the load (drum) 621.
  • the rotation axis of the load (drum) 621 is horizontal, but it may be vertical or oblique.
  • the power transmission path for rotating the load (drum) 621 is also shown using the pulley 622 and the belt 623.
  • a gear may be used, or a motor (direct drum) 621 may be provided with a motor directly on the shaft of the load (drum) 621 so as to rotate at the same speed.
  • the configuration of the lid lock unit 640 is not limited to the configuration described in the present embodiment.
  • a plurality of lid lock portions may be provided.
  • a configuration in which a lid lock portion that can be unlocked at any time by a user's handle operation and a device that is unlocked by a signal from the control portion may be used in combination.
  • the steering wheel operation may be disabled by a signal from the control unit. In any case, it is sufficient that the user can change whether or not the user can open the lid by a signal from the control unit.
  • FIG. 40 is a block diagram of an inverter device according to Embodiment 12 of the present invention.
  • Equation 9 is an equation used by the three-phase / two-phase converter of the inverter device.
  • the inverter device includes a belt 746 serving as a power transmission path, a pulley 747, a load 748, a motor 750, a DC power source 751 that outputs a voltage VDC, an inverter circuit 758 that supplies an AC current to the motor 750, and a control circuit. 760.
  • the electric motor 750 includes permanent magnets 741 and 742 and three-phase windings 743, 744, and 745.
  • the inverter circuit 758 includes six switching elements 752, 753, 754, 755, 756, and 757.
  • the control circuit 760 controls on / off of the switching elements 752, 753, 754, 755, 756, and 757.
  • the DC power supply 751 outputs a DC voltage from itself, such as a battery, or rectifies a single-phase or three-phase 100V or 200V AC power supply having a frequency such as 50 Hz or 60 Hz with a rectifier, an electrolytic capacitor, etc. The one smoothed with is used.
  • the DC power supply 751 functions as a power source during power running.
  • the number of permanent magnets 741 and 742 is two in order to simplify the explanation, but in reality, it has a four-pole configuration. In a state where the permanent magnets 741 and 742 rotate once at a mechanical angle, the permanent magnets 741 and 742 rotate twice electrically (rotates twice at an electrical angle).
  • the control circuit 760 includes a gate drive circuit 761, a current detection unit 766, a frequency detection unit 768 that receives the output of the current detection unit 766, and periodically detects the frequency, and a stop determination unit 770 that determines stop of the electric motor 750.
  • the current detection unit 766 detects an alternating current input to the electric motor 750 using the resistors 762, 763, 764 and the amplifier circuit 765.
  • the frequency detection unit 768 includes a three-phase / two-phase conversion unit 772, a polar coordinate conversion unit 773, and a differentiation unit 774.
  • the three-phase / two-phase conversion unit 772 uses (Equation 9) to calculate the ⁇ component of the stationary coordinates ( ⁇ ) (the component in the same direction as the magnetomotive force of the U-phase current Iu) and the ⁇ component (from ⁇ to ⁇ / 2). (Advanced orthogonal component) is calculated.
  • Equation 9 is an example, and a cosine function (cos) and a sine function (sin) may be mixed and used.
  • a cosine function or a sine function may not be used.
  • the value used as the coefficient or constant may be a value that is appropriately multiplied by a real number as long as it is only used for the stop determination of the present embodiment.
  • a number with a square root may be substituted with an approximate fraction (rational number).
  • the control circuit 760 controls the switching elements 755, 756, and 757 to be turned on and the switching elements 752, 753, and 754 to be turned off during the short circuit braking period. Thereby, the input voltage of the electric motor 750 becomes substantially zero during the braking period of the load 748.
  • the frequency detection unit 768 calculates the angular velocity ⁇ from the magnitude of temporal change by differentiating the phase ⁇ of the current vector at the stationary coordinates ( ⁇ ) by the differentiating unit 774 within the short circuit braking period.
  • the stationary coordinates ( ⁇ ) are output from the three-phase / two-phase converter 772.
  • the frequency detection unit 768 outputs ⁇ that is a value corresponding to the frequency.
  • the output ⁇ of the frequency detector 768 is compared with the reference angular velocity ⁇ th in the comparator 777. If ⁇ > ⁇ th, the angular velocity is determined to be greater than a predetermined value, and the comparator 777 outputs a High signal.
  • of the polar coordinate conversion unit 773 is also led to the comparator 778 and compared with the reference current value Ith.
  • > Ith the magnitude of the current vector is determined to be larger than a predetermined value, and the comparator 778 outputs a high signal.
  • the AND circuit 779 outputs a logical product of the outputs of the comparators 777 and 778, and when
  • the stop determination unit 770 includes a 100 Hz clock oscillator 781, a counter 782, and a comparator 783.
  • the counter 782 When the signal from the AND circuit 779 input to the E terminal is High, the counter 782 is cleared to zero.
  • the clock oscillator 781 When the signal from the AND circuit 779 input to the E terminal is Low, the clock oscillator 781 outputs a value CNT obtained by counting up 100 Hz pulses to the comparator 783.
  • FIG. 41 is a diagram showing a current vector during a short-circuit braking period of the inverter device according to the twelfth embodiment of the present invention.
  • the current vector of the current flowing into the electric motor 750 with respect to the stationary coordinate ⁇ is represented by Ia, and I ⁇ and I ⁇ are components of each axis, which corresponds to the output of the three-phase / two-phase converter 772.
  • the polar coordinate conversion unit 773 converts the current vector into polar coordinates, that is, an angle (phase) ⁇ from the ⁇ axis and an expression of an absolute value
  • FIG. 42 is an operation waveform diagram for the short-circuit braking period of the inverter device according to the twelfth embodiment of the present invention.
  • 42A shows the U-phase current Iu waveform of the electric motor 750
  • FIG. 42B shows the output
  • FIG. 42C shows the output phase ⁇ waveform of the polar converter 773.
  • (d) shows the output ⁇ waveform of the differentiating unit 774
  • the current flowing into the three-phase motor 750 includes Iv and Iw (not shown) other than Iu shown in (a), and the phases are delayed by 120 degrees and 240 degrees with respect to Iu, respectively.
  • in (b) and ⁇ in (d) are very similar in that they finally become zero when the velocity finally becomes zero.
  • the time t1 when ⁇ ⁇ th is slightly earlier than the time t2 when
  • the stop determination is performed after the first predetermined time has elapsed after the angular velocity ⁇ has become equal to or less than the predetermined value.
  • the first predetermined time of 0.3 seconds is as follows with the motor 750 short-circuited.
  • the kinetic energy of the load 748 having a moment of inertia at a speed corresponding to the electrical angular speed ⁇ th is completely consumed, and the rotation speed is zero, that is, longer than the time until a complete stop state is reached. Value.
  • the stop determination signal S1 High is always output in a state where the load 748 is stopped.
  • the determination is not based on the current value (magnitude) in the short-circuit state but on the angular velocity ⁇ of the current vector at the stationary coordinates by the frequency detection unit 768.
  • it can be made insensitive about the dispersion
  • it can be made insensitive to variations in the magnitude of the short-circuit current generated by variations in the on-voltage (or on-resistance) of the switching elements 752, 753, 754, 755, 756, and 757. Therefore, stable stop determination can be performed.
  • braking is performed to cause the electric motor 750 to absorb the kinetic energy from the load 748. For this reason, only the short-circuit braking period in which the switching elements 755, 756, and 757 on the low potential side are kept on so that the input voltage of the electric motor 750 becomes substantially zero is assumed. However, there may be a period of braking other than the short-circuit braking period. For example, Iq is set to be negative using vector control, and short-circuit braking is performed in a period in which regenerative power is consumed as appropriate by effective use of a resistor or other electric load as long as the DC voltage VDC of the DC power supply 751 is not excessive. It may be included before the period.
  • the switching elements 755, 756, and 757 are not suddenly turned on all at once, but are sequentially turned on according to the phases of the permanent magnets 41 and 42, or the input voltage of the electric motor 750 is gradually changed within a predetermined period. You may control so that it may become zero. Thus, a period for preventing a transient overcurrent may be provided before the short circuit braking period.
  • At least one of the three-phase low-potential side switching elements performs pulse width modulation less than 100%.
  • a braking period in which the generated torque is negative may be provided.
  • the operation of the frequency detection unit 768 is set to the current angular velocity detection period in which the angular velocity ⁇ is calculated from the temporal change of the phase ⁇ of the current vector in the stationary coordinates in the short circuit braking period.
  • I is determined to be sufficiently high based on a threshold value such as Ith2, and forcibly stopped without particularly operating the frequency detection unit 768
  • the determination signal S1 may be Low.
  • a configuration that forcibly keeps the input of the stop determination unit 770 high may be added by using an OR circuit.
  • the upper limit of the speed range ( ⁇ range) in which the frequency detection unit 768 needs to detect ⁇ normally is lowered, and the electrical angular speed detection period becomes a part of the short-circuit braking period.
  • a low-cost or low-consumption energy consumption or a microcomputer using a low processing speed may be used.
  • the configuration of the frequency detection unit 768, the comparators 777 and 778, the AND circuit 779, the stop determination unit 770, etc. has been described with the notation of the hardware circuit diagram. However, in reality, it is also possible to perform software processing by preparing a program in the microcomputer.
  • the control unit 760 receives the output of the current detection unit 766 and periodically determines the frequency detection unit 768 that detects the frequency, and the stop determination that determines whether the electric motor 750 is stopped. And a short-circuit braking period for controlling the switching elements 755, 756, and 757 so that the input voltage of the electric motor 750 becomes substantially zero during the braking period of the load (drum) 748, and the stop determination unit 770
  • the electric motor 750 is determined to be stopped after the first predetermined time has elapsed since the output of the frequency detection unit 768 is no longer equal to or greater than the predetermined value. Thereby, it is possible to appropriately determine the stop of the electric motor 750 with a simple configuration.
  • the washing machine includes a current angular velocity detection period in which the frequency detection unit 768 calculates an angular velocity from a temporal change in the phase of the current vector at a stationary coordinate within the short-circuit braking period, and the angular velocity is predetermined. After falling below the value, stop determination is performed. Thereby, it is possible to appropriately determine the stop of the electric motor 750 with a simple configuration.
  • FIG. 43 is a block diagram of an inverter device according to Embodiment 13 of the present invention.
  • the control circuit 788 uses a microcomputer 789 and a ceramic oscillator 790.
  • Other components are the same as those in the twelfth embodiment.
  • Analog outputs Iu, Iv, and Iw from the current detection unit 766 are connected to input terminals of AD1, AD2, and AD3 of the microcomputer 789, respectively. It is converted into a digital value by an analog / digital converter configured internally by hardware. From the ceramic oscillator 790, a high-frequency clock signal is input to the Clock terminal, and calculation processing is performed with a signal of several tens of MHz.
  • the gate drive circuit 761 outputs a total of six signals of switching elements 752, 753, 754, 755, 756, and 757 as pulse width modulated PWM signals, and performs on / off control of each switching element. From the OUT terminal, a digital stop determination signal S1 is output as a result of running the program.
  • FIG. 44 is a flowchart of the program of microcomputer 789 of the inverter device according to the thirteenth embodiment of the present invention.
  • the microcomputer 789 has a built-in flash memory.
  • a flash writer In addition to rewriting with a special instrument called a flash writer, rewriting by a user can also be performed through various wired / wireless communication lines.
  • interrupt signals with a period of 128 ⁇ s are constantly generated.
  • a “128 ⁇ s interrupt” process is executed every 128 ⁇ s (step S795).
  • T1 ⁇ T1 + ⁇ T, T2 ⁇ T2 + ⁇ T an addition of ⁇ T of 128 ⁇ s is performed on the variables of T1 and T2 (step S796).
  • a “current calculation routine” step S797) for processing the signal of the current detection unit 766 is entered, and the values converted into digital values from the input values of AD1 to AD3 are captured by “Iu, Iv, Iw” (step S798). ), This is changing in amperes.
  • the current value here is represented by a signed variable with the direction from the inverter circuit 758 toward the electric motor 750 being positive, and the reverse current being negative.
  • step S799 the coordinates are converted into orthogonal coordinates ⁇ in the stationary coordinates (step S799).
  • the square of the magnitude (absolute value) of the current vector Ia is calculated by “Ia 2 ⁇ I ⁇ 2 + I ⁇ 2 ” (step S800).
  • Ia 2 > Ith 2 ?” It is determined whether or not the output level Ia of the current detection unit is greater than a predetermined value Ith (step S801).
  • the squared values are compared for both the output level Ia and the predetermined value Ith, but both square roots may be compared. As in this embodiment, when the squared values are compared with each other, the internal processing of the microcomputer 789 is performed at high speed.
  • step S801 If “Ia 2 > Ith 2 ?” Is No (step S801), that is, if the output level of the current detection unit 766 is less than a predetermined value, the process goes straight to the “stop determination unit” configured by the routine ( Step S810). In this case, the part for updating the detection frequency described below is skipped.
  • step S801 the process proceeds to the “frequency detection unit” configured in the routine (step S812).
  • the phase ⁇ of the current vector is calculated by “ ⁇ new ⁇ tan ⁇ 1 (I ⁇ / I ⁇ )” (step S813).
  • T1 ⁇ 375 ⁇ s?” Determines whether or not the elapsed time T1 from the time when the previous phase ⁇ is obtained is shorter than the first predetermined time (step S814). In the case of No, that is, when the elapsed time T1 is long, it is determined that it is too long to be used as the calculation interval of the angular velocity ⁇ described below, and the ⁇ calculation is not performed.
  • step S814 the change [radian] of the phase ⁇ from the time when the previous phase ⁇ was calculated is calculated as ⁇ in “ ⁇ ⁇ ⁇ new ⁇ old” (Ste S815).
  • step S816 the electrical angular frequency ⁇ is calculated (step S818), that is, the operation as the frequency detector is performed (step S812).
  • step S820 It is determined whether or not the output ⁇ of the frequency detection unit is equal to or greater than a predetermined value ⁇ th (step S820). If it is large, the process of “T2 ⁇ 0” is performed (step S821), and if it is small, the process is skipped. Therefore, the T2 value indicates the elapsed time from when the output ⁇ (step S812) of the frequency detection unit is no longer equal to or greater than the predetermined value ⁇ th. After “ ⁇ old ⁇ ⁇ new” and “T1 ⁇ 0”, the update of ⁇ and the elapsed time from the previous update are cleared (steps S823 and S825), and then the routine proceeds to the “stop determining unit”. (Step S810).
  • Tb 0.3 [seconds] is set (step S828).
  • “stop determination flag setting” is performed because the state has exceeded 0.3 seconds since the output ⁇ of the frequency detection unit is no longer equal to or greater than the predetermined value ⁇ th (step S829).
  • the “initial setting routine” by setting a value larger than 375 ⁇ s, such as “T1 ⁇ 1000 ⁇ s”, and setting “T2 ⁇ 0”, appropriate processing in the current angular velocity detection period can be started.
  • the stop determination flag is confirmed.
  • the processing necessary for the inverter device in the state where the stop determination is made is performed. Start. Incidentally, at the time of power running, the process for controlling the speed of the electric motor 750 can also be performed by the “3.3 ms cycle interrupt service routine”.
  • FIG. 45 is an operation waveform diagram of microcomputer 789 of the inverter device according to the thirteenth embodiment of the present invention. 45, (a) shows the magnitude (absolute value)
  • of the current vector, (b) shows the output of the electrical angle ⁇ , and (c) shows the output of the electrical angular velocity ⁇ . 45, the interrupt routine shown in FIG. 44 operates every ⁇ t 128 ⁇ s, and processing is performed at t1, t2, t3.
  • is because the mass of the load 48 is biased or the noise component is included in the current signals of Iu, Iv, and Iw.
  • the state is lower than the predetermined value Ith, that is, the output level of the current detection unit 766 is lower than the predetermined value Ith, and at other timings, it is higher than Ith.
  • the electrical angle ⁇ shown in (b) the rate of change (inclination) may actually fluctuate with the progress of braking (braking), but for the sake of simplicity, the rate of change of the electrical angle ⁇ is It is shown as almost constant.
  • the phase ⁇ of the current vector is calculated by “ ⁇ new ⁇ tan ⁇ 1 (I ⁇ / I ⁇ )” (step S813).
  • the electrical angular velocity ⁇ is also calculated when “ ⁇ ⁇ ⁇ / T1” is passed (step S818), and ⁇ is updated after the time td required for the calculation.
  • the phase ⁇ is not updated and ⁇ is not updated, and conversely, when the frequency detection unit has the output level
  • the elapsed time T1 from the previous phase ⁇ detection is 256 ⁇ s corresponding to 2 ⁇ T. Since “T1 ⁇ 375 ⁇ s?” Is Yes (step S814), ⁇ 5 is calculated and updated from the phase ⁇ change between 256 ⁇ s.
  • FIG. 46 is a diagram showing a case where the magnitude
  • has fallen below the predetermined value Ith twice at t2 and t3, at t4, the elapsed time T2 from the time t1 when the previous phase ⁇ was detected has reached 384 ⁇ s. In this case, “T1 ⁇ 375 ⁇ s?” Is No (step S814), and ⁇ is not calculated (updated).
  • the current angular velocity detection period may be entered even if the speed of the electric motor 750 is 50,000 revolutions per minute at the maximum.
  • One period (2 ⁇ [radian]) of the angular velocity (electrical angle) at that velocity is 600 ⁇ s.
  • the threshold value of 375 ⁇ s provided in the present embodiment directly indicates time, but the interrupt cycle is 128 ⁇ s. Therefore, it may be judged by the number of periodic interrupts, such as “when it is less than 2 times” and “when it is more than 3 times” of the interrupt cycle. Become. Since
  • the frequency detection unit stores the phase ⁇ of the current vector Ia at the stationary coordinate ⁇ when the output level
  • the detection frequency ⁇ is not updated.
  • the detection frequency ⁇ is calculated by division from the previous phase difference ⁇ and the elapsed time T2, and updated (step S812). Therefore, it is possible to realize stop determination with extremely high reliability and stability without worrying about erroneous detection due to a delay in circulation.
  • the magnitude of the current vector at the stationary coordinates ⁇ is used. This makes it possible to make a stable determination with a
  • the frequency detection unit 768 updates the detection frequency when the output level of the current detection unit 766 is equal to or higher than a predetermined value. Thereby, reliable stop determination can be performed.
  • the frequency detection unit 768 has a time interval for calculating the angular velocity within the current angular velocity detection period shorter than one cycle of the angular velocity at the maximum speed within the current angular velocity detection period. Let it be a period. Thereby, stop determination with high reliability and stability can be performed.
  • the frequency detection unit 768 when the frequency detection unit 768 has the output level of the current detection unit 766 equal to or higher than a predetermined value, the phase of the current vector at the stationary coordinate is stored, and the phase from the previously stored phase is stored.
  • the detection frequency is not updated.
  • the detection frequency is calculated and updated from the phase difference from the previous time and the elapsed time. I do. Thereby, reliable stop determination can be performed.
  • FIG. 47 is a flowchart of the inverter device according to the fourteenth embodiment of the present invention.
  • the hardware configuration is the same as that of the thirteenth embodiment. Only the algorithm of the control program written in the flash memory portion in the microcomputer 789 is different.
  • FIG. 47 particularly shows a flowchart of the “interrupt service routine with a period of 3.3 ms”.
  • the load stop estimation unit of the present embodiment realized by a routine starts processing from “3.3 ms interrupt” (step S841).
  • the “stop determination flag” it is determined whether or not the “stop determination flag set” (step S829) in FIG. 44 of the interrupt operation with a period of 128 ⁇ s has been performed (step S844). If the flag is set (High), the process proceeds to the transmission mechanism breakage detector (step S845).
  • the transmission mechanism breakage detector first determines a “breakage flag” (step S846). Here, in the case of Low, the process proceeds to the determination of “T3 ⁇ Tc?” (Step S847). In the present embodiment, the value of Tc is 10 seconds.
  • step S848 If “Yes” here, the “damage flag set” is executed, and the damage flag ⁇ High is executed (step S848). If “T3 ⁇ Tc?” Is No (step S847), the process proceeds to “Tu ⁇ 0” (step S849). Thereafter, the process proceeds to the determination of “T3> Tu?” (Step S850), and in the case of Yes, “load stop estimation flag set” is performed (step S851). At “END”, the “3.3 ms cycle interrupt service routine” ends (step S852).
  • T3 is a variable indicating an elapsed time after entering the short circuit braking period. If the stop flag becomes High at the time of T3 ⁇ Tc, the destruction determination is made with “destruction flag set” (step S848).
  • T3> Tc, the delay for load stop estimation is canceled by “Tu ⁇ 0” (step S849).
  • Step S850 a load stop is estimated using the “load stop estimation flag set” (step S851).
  • FIG. 48 is a graph showing characteristics of the load stop estimation unit (step S840) of the inverter device according to the fourteenth embodiment of the present invention.
  • the horizontal axis of (a) indicates the time Tmstop from the start of the short-circuit braking period until the motor 750 stops.
  • the vertical axis of (a) indicates the time Tlstop from the start of the short-circuit braking period until the load stop estimation unit sets the load stop estimation flag and outputs the load stop estimation signal (step S840).
  • (b) shows the value of the damage flag for the horizontal axis equivalent to (a), that is, the damage signal Sj.
  • the belt 746 in the power transmission path between the electric motor 750 and the load 748 is cut before the short circuit braking period, during the short circuit braking period, or when the belt 746 is detached from the pulley 747, the following occurs.
  • the braking action that is, the action of the motor 750 absorbing the kinetic energy of the load 748 is not performed. Even if the electric motor 750 is stopped, the load 748 may continue to rotate for a while due to inertia. In that case, the rotation of the electric motor 750 tends to stop in a short time after absorbing only the kinetic energy of only the electric motor 750 from the start of the short-circuit braking.
  • the transmission mechanism breakage detection unit detects abnormality of the transmission mechanism with a relatively simple configuration (step S845).
  • the delay time tex does not become a fixed time as a result.
  • the load stop estimation signal is output after at least the load 748 is stopped. Therefore, when there is a possibility that the person may touch the load 748, the safety problem can be prevented by setting the timing when the person is allowed to touch after the stop of the load 748.
  • the transmission mechanism breakage detection unit in the present embodiment outputs a breakage signal when the short-circuit braking period is shorter than the second predetermined time Tc (step S845).
  • the configuration is not limited to this.
  • the temporal change of the angular velocity ⁇ during the short-circuit braking period that is, the determination may be made when the angular acceleration is decelerated greater than a predetermined value. Conceivable.
  • the washing machine includes the transmission mechanism breakage detection unit that detects an abnormality in the power transmission path 746 between the electric motor 750 and the drum 748, and the drum stop estimation unit.
  • a breakage signal is received from the transmission mechanism breakage detection unit, a drum stop estimation signal delayed from the stop determination is output.
  • the transmission mechanism breakage detection unit outputs a breakage signal when the time from the start of the short-circuit braking period to the stop of the electric motor 750 is shorter than the second predetermined time. .
  • FIG. 49 is a diagram showing an internal configuration of the dehydrator according to the fifteenth embodiment of the present invention when viewed from the side.
  • a load 855 is a drum 857 having a large number of holes in which a material to be dehydrated 856 is accommodated, and a shaft 858 of the drum 857 is rotatably held by ball bearings 860 and 861.
  • the electric motor 863 has substantially the same configuration as the electric motor 750 of the twelfth embodiment.
  • the pulley 864 and the pulley 865 are each connected by a belt 866.
  • the drum 857 is driven to rotate, a centrifugal force is applied to the object to be dehydrated 856, dehydration is performed from the hole of the drum 857, water is received by the receiving cylinder 867 surrounding the periphery, and then guided to the drain hose 868 for dehydration operation. I do.
  • the inverter device 870 is provided with an inverter circuit 871 and a control circuit 872 having the same configurations as those described in Embodiments 12 to 14.
  • inverter device 870 includes solenoid drive circuit 875 that receives stop determination signal S ⁇ b> 1 from control circuit 872.
  • a door 877 that can be opened and closed, and the open state is indicated by a one-dot chain line.
  • a locking portion 880 for keeping the closed state is provided by a solenoid 881, an iron lock bar 882 that moves up and down by the solenoid 881, and a claw 883 that engages with the lock bar 882 in the closed state. It is configured. When the claw 883 and the lock bar 882 are engaged, the door 877 is not opened even if it is pulled. Therefore, the user is prevented from putting his hand into the drum 857.
  • the lock bar 882 When the current is supplied from the solenoid drive circuit 875 to the solenoid 881, the lock bar 882 is pulled up against the gravity by the magnetic field generated by the solenoid 881. For this reason, the lock is released.
  • the user can open the door 877 and touch a material to be dehydrated 856 with a hand or the like in the drum 857.
  • the door sensor 885 has a contact, detects the open / closed state of the door 877, and outputs it as an S2 signal. When the door 877 is closed, a High signal is transmitted to the control circuit 872.
  • FIG. 50 is an operation waveform diagram of the dehydrator according to the fifteenth embodiment of the present invention.
  • (a) shows the electric angular velocity ⁇
  • (b) shows the stop determination signal S1
  • (c) shows the waveform of the U-phase low-potential-side gate signal Sg of the inverter circuit 871.
  • (d) shows the current Ik supplied to the solenoid 881
  • (e) shows the waveform of the door opening / closing signal S2 until the user opens the door after stopping after entering the braking (brake) from dehydration. Show.
  • a gate signal with PWM applied for driving the electric motor 863 is supplied. Note that gate signals other than the low-potential side of the U phase are omitted. However, in the power running period, both are gate signals to which PWM is applied.
  • the gate signals on the low potential side all rise for the three phases U, V, and W, and are in a state called beta-on.
  • the input voltage of the electric motor 863 is in a short-circuit braking state that is substantially zero, and thereafter ⁇ gradually decreases.
  • the time measurement of 0.3 seconds that is the first predetermined time is started from the time when ⁇ reaches ⁇ th.
  • the drum 857 is stopped. S1 rises to high at t4, which is 0.3 seconds after the first predetermined time from t2, and the supply current Ik from the solenoid drive circuit 875 to the solenoid 881 rises.
  • Sg is in a low (off) state, and the short circuit braking is released.
  • Sg may continue to be high after t4, and the safety to the user against unexpected rotation of the drum 857 can be enhanced.
  • a configuration in which short-circuit braking is performed only during a period in which S2 is High is also possible.
  • the action of suppressing the movement of the drum 857 can also be obtained by passing a direct current of a predetermined magnitude through the electric motor 863. Therefore, a period for supplying a direct current from the inverter circuit 871 may be provided after t4.
  • the door 877 can be freely opened and closed, and since the user opened the door 877 at t5, S2 shown in (e) is Low.
  • the role of the S2 signal is used when driving the electric motor 863 with the door 877 closed from the viewpoint of preventing danger at the start of the dehydrating operation.
  • the logic prohibits activation. That is, the period from the start of the dehydration operation to t4 is a lock period for keeping the door 877 closed, and there is a lock period in the stop determination t4.
  • the first predetermined time from when ⁇ falls below ⁇ th until the stop determination is output is set to a short time of 0.3 seconds.
  • the delay time of the stop determination timing from the actual stop t3 of the drum 857 is limited to 0.17 seconds at the maximum. Therefore, the user does not waste time, can take out the dehydrated material 856 that has been dehydrated, and can use the time effectively.
  • a configuration like the transmission mechanism breakage detection unit described in the fourteenth embodiment may be used. That is, a configuration in which the door 877 is unlocked after the load stop estimation signal is also effective.
  • the belt 866 is cut, in the case of the dehydrator, there is a value of about 0.3 kg square meter even if the moment of inertia of the drum 857 is empty.
  • the reduction ratio (speed ratio) based on the diameter ratio of the pulleys 864 and 865 is 10: 1
  • the moment of inertia converted to the shaft of the electric motor 163 is 0.003 kg square meter.
  • a configuration is also conceivable in which the transmission mechanism breakage is detected from the magnitude of the angular acceleration with respect to the q-axis current while calculating the current vector in dq coordinates during braking.
  • the belt 866 is lost and there is a rapid deceleration as described above, the dq coordinate detection error tends to increase, and a complicated configuration is required.
  • the configuration of the present invention using the stationary coordinates in the short-circuit braking period is simple, and a highly reliable transmission mechanism breakage detection can be obtained, which is very effective.
  • the current is once supplied from the inverter circuit 871 to the electric motor 863, and it is detected from the relationship between the electric current and the voltage that the load torque connected to the electric motor 863 is not extremely small.
  • a transmission mechanism breakage detection period may be provided. As a result, it is possible to realize a safer dehydrator that takes into consideration.
  • the housework equipment is clothing that is to be dehydrated.
  • some commonly called washing machines, washing dryers, etc. have a function as a dehydrator. Such a thing may be used.
  • a fully automatic washing machine that automatically performs washing and rinsing in order
  • dehydration operations such as dehydration of water containing detergent and dewatering of rinsed water.
  • the process proceeds to the next step (sequence) after dehydration is completed.
  • the stop determination of the inverter device of the present invention Even in the case of an apparatus having such a sequence after dewatering, it is possible to make a stop determination with very little delay with respect to the actual stop of the drum by using the stop determination of the inverter device of the present invention. . For this reason, the dead time until moving to the next sequence is shortened as much as possible. As a result, the time required for a fully automatic washing course (washing-dehydration-rinsing-dehydration) can be shortened, and the effect of shortening the time can be obtained.
  • the rotation axis of the drum 857 is horizontal, it may be vertical or oblique.
  • the power transmission path for rotationally driving the drum 857 the one using the pulleys 864 and 865 and the belt 866 is shown.
  • a gear may be used, or a motor may be provided directly on the shaft 858 of the drum 857 and rotated at the same speed as called direct drive.
  • the washing machine according to the present invention can be applied to a washing machine capable of ensuring safety without providing a position detector such as a Hall IC.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Stopping Of Electric Motors (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

La présente invention se rapporte à un lave-linge qui comprend : un tambour (106) destiné à contenir des vêtements (105); et un moteur (109) comportant des aimants permanents (100, 101) et des enroulements triphasés (102, 103, 104) destinés à entraîner le tambour (106). Le lave-linge comprend en outre un couvercle destiné à recouvrir et à découvrir l'ouverture du tambour (106), ainsi qu'un verrou de couvercle destiné à verrouiller le couvercle. Le lave-linge comprend en outre un circuit onduleur (117) qui reçoit le courant d'une source de courant continu (144) et fournit le courant au moteur (109) à l'aide d'une pluralité d'éléments de commutation (111, 112, 113, 114, 115, 116). Le lave-linge comprend en outre une unité de commande (118) destinée à mettre sous tension et hors tension les éléments de commutation (111, 112, 113, 114, 115, 116).
PCT/JP2014/003764 2013-07-18 2014-07-16 Lave-linge WO2015008486A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE112014003296.4T DE112014003296T5 (de) 2013-07-18 2014-07-16 Waschmaschine
CN201480040857.4A CN105378174B (zh) 2013-07-18 2014-07-16 洗衣机

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP2013-149262 2013-07-18
JP2013149262A JP6295407B2 (ja) 2013-07-18 2013-07-18 インバータ装置およびこれを用いた脱水機
JP2014032679A JP6229160B2 (ja) 2014-02-24 2014-02-24 洗濯機
JP2014-032680 2014-02-24
JP2014032680A JP6361018B2 (ja) 2014-02-24 2014-02-24 インバータ装置およびこれを備えた洗濯機
JP2014-032684 2014-02-24
JP2014032684A JP6229162B2 (ja) 2014-02-24 2014-02-24 洗濯機
JP2014-032679 2014-02-24

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DE102015220910A1 (de) * 2015-10-27 2017-06-01 BSH Hausgeräte GmbH Spannungsüberwachung für eine Motoransteuerschaltung eines bürstenlosen Waschmaschinenmotors
JP2018068324A (ja) * 2016-10-24 2018-05-10 パナソニックＩｐマネジメント株式会社 洗濯機
CN109150031A (zh) * 2017-06-15 2019-01-04 株式会社牧田 电动作业机
WO2019163320A1 (fr) * 2018-02-22 2019-08-29 パナソニックＩｐマネジメント株式会社 Circuit de commande pour outil électrique
US11136705B2 (en) 2019-05-15 2021-10-05 Haier Us Appliance Solutions, Inc. Detecting mechanical decoupling in a laundry appliance
US20220068535A1 (en) * 2020-08-28 2022-03-03 Hubbell Incorported Magnet control units
TWI869746B (zh) * 2022-12-22 2025-01-11 偉詮電子股份有限公司 馬達控制裝置及其馬達的剎車方法

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DE102018200513A1 (de) * 2018-01-15 2019-07-18 Robert Bosch Gmbh Bremsvorrichtung
JP7028676B2 (ja) * 2018-02-28 2022-03-02 ミネベアミツミ株式会社 モータの駆動制御装置およびモータの駆動制御方法
CN111118822A (zh) * 2018-10-15 2020-05-08 无锡飞翎电子有限公司 控制装置和洗衣机
KR102636050B1 (ko) * 2019-01-03 2024-02-14 현대자동차주식회사 공기 압축기 모터의 홀 센서 신호지연의 보정 방법
CN109905068A (zh) 2019-03-13 2019-06-18 阳光电源股份有限公司 电机控制器及其主动短路电路和方法
JP7474917B2 (ja) * 2019-10-03 2024-04-26 パナソニックＩｐマネジメント株式会社 洗濯機
CN111049463B (zh) * 2019-12-26 2021-12-21 深圳市蓝海华腾技术股份有限公司 电机退出三相主动短路模式的方法及控制装置

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DE102015220910A1 (de) * 2015-10-27 2017-06-01 BSH Hausgeräte GmbH Spannungsüberwachung für eine Motoransteuerschaltung eines bürstenlosen Waschmaschinenmotors
JP2018068324A (ja) * 2016-10-24 2018-05-10 パナソニックＩｐマネジメント株式会社 洗濯機
CN109150031A (zh) * 2017-06-15 2019-01-04 株式会社牧田 电动作业机
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WO2019163320A1 (fr) * 2018-02-22 2019-08-29 パナソニックＩｐマネジメント株式会社 Circuit de commande pour outil électrique
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US20220068535A1 (en) * 2020-08-28 2022-03-03 Hubbell Incorported Magnet control units
US11521774B2 (en) * 2020-08-28 2022-12-06 Hubbell Incorporated Magnet control units
TWI869746B (zh) * 2022-12-22 2025-01-11 偉詮電子股份有限公司 馬達控制裝置及其馬達的剎車方法
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CN105378174B (zh) 2017-04-05
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