CN105471358A - Motor control device - Google Patents
Motor control device Download PDFInfo
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- CN105471358A CN105471358A CN201510572450.2A CN201510572450A CN105471358A CN 105471358 A CN105471358 A CN 105471358A CN 201510572450 A CN201510572450 A CN 201510572450A CN 105471358 A CN105471358 A CN 105471358A
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Abstract
The invention provides a motor control device comprising the following structures: a converter electrically connected with a three-phase AC power source; an inverter electrically connected with the converter and the motor; a control portion used for detecting the current flowing between the three-phase AC power source and the converter, and controlling the inverter. The control portion can control according to the current value flowing the three-phase, so the maximum current flowing the three-phase has the absolute value bigger than 0 and smaller than a preset value.
Description
The cross reference of related application
No. 2014-199020, the Japanese patent application that the application submitted to the Japanese Patent Room based on 09 29th, 2014, is therefore incorporated to the full content of described Japanese patent application herein by reference.
Technical field
Invention relates to a kind of control device of electric motor.
Background technology
In control device of electric motor, transducer carries out rectification to the three-phase alternating current of three-phase alternating-current supply and is converted into direct current.Above-mentioned direct current is converted to alternating current by inverter again.Above-mentioned alternating current is utilized to carry out drive motor.
In this control device of electric motor, such as, because high pressure is connected with the device of single phase poaer supply by the imbalance of the impedance of controller switching equipment or identical three-phase power line, the imbalance of load is sometimes produced.Thus, sometimes in the alternating voltage of input control device of electric motor, imbalance is produced.
Transducer comprises the semiconductors such as rectifier diode.Therefore, if produce uneven in alternating voltage, then the electric current of the phase determined likely exceedes the maximum current (allowable current) of allowing of rectifier diode.Thus, if the electric current of the phase determined exceedes the allowable current of rectifier diode, then rectifier diode is likely damaged.In addition, even if when the electric current of the phase determined does not exceed the allowable current of rectifier diode, the electric current sometimes more than rated current also flows continuously through at certain hour.In this case, the temperature of rectifier diode rises.Further, if the temperature of rectifier diode exceedes setting, then rectifier diode is likely damaged.
In order to prevent or suppress above-mentioned phenomenon, in flat No. 5-30644 of Japanese Laid-Open Patent Publication, propose the imbalance of detection three-phase alternating-current supply to protect the method for rectifier diode.The rectifier protection circuit protection recorded in flat No. 5-30644 of Japanese Laid-Open Patent Publication has the rectifier of smmothing capacitor; the three-phase alternating voltage that the input of this smmothing capacitor is provided by derailing switches such as block devices, and make the smoothing of output commutating voltage.Above-mentioned protective circuit comprises current detector and relay circuit.Current detector is connected respectively and is inserted and be connected on the input electrical path of each phase between derailing switch and rectifier.Current detector detects the peak value of input current, sends output signal when this peak value is more than the overcurrent set point becoming regulation.When any one of the current detector of each phase sends output signal, relay circuit makes derailing switch open.
In flat No. 5-30644 technology recorded of Japanese Laid-Open Patent Publication, due to each mutually in the peak value of input current of any phase become more than overcurrent set point time derailing switch open, so the inverter being connected to transducer rear stops.When being made device action by Driven by inverter motor, because equipment stops, so lose middle generations such as production lines.That is, in the flat 5-30644 method of Japanese Laid-Open Patent Publication, be difficult to not make equipment stop and protecting rectifier diode when unbalanced power supply.In addition, in the method for flat No. 5-30644 of Japanese Laid-Open Patent Publication, if the electric current of the phase determined continues at certain hour the state becoming more than rated current, then the temperature of rectifier diode raises, and junction temperature exceedes setting, rectifier diode is likely damaged.
Summary of the invention
The object of the present invention is to provide and a kind ofly can protect the control device of electric motor of transducer without arrestment as far as possible when unbalanced power supply.
The invention provides a kind of control device of electric motor, it has: transducer, is electrically connected with three-phase alternating-current supply; Inverter, is connected with described transducer and electric electromechanics; And control part, detect the electric current flow through between described three-phase alternating-current supply and described transducer, and described inverter is controlled, described control part controls, based on the value of electric current flowing through three-phase, the absolute value making to flow through the electric current of the phase that maximum current flows through in the electric current of three-phase is in larger than zero and below setting scope.
The described electric current flowing through three-phase can be flow through the electric current between three-phase alternating-current supply and described transducer.Described control part can control based on the value of the electric current flow through between described three-phase alternating-current supply and described transducer, by restriction for controlling the rate of change of speed command of the described motor of described inverter, make to flow through in the electric current of described three-phase, the absolute value of the electric current of phase that maximum current flows through than zero greatly and than little when not carrying out described restriction.
Described control part can control, and by limiting the rate of change of the speed command of described motor, makes to flow through the absolute value of the current value of the phase that maximum current flows through in the electric current of three-phase below setting.
This control device of electric motor can also have regeneration resistance section, described regeneration resistance section is configured in the circuit connecting described transducer and described inverter, during regeneration, when the absolute value of the current value of the phase that maximum current in the electric current flowing through three-phase flows through becomes more than setting, described control part cuts off the electric current regenerated to described three-phase alternating-current supply from described transducer, and makes electric current flow through described regeneration resistance section.
Described control part can calculate the amount of unbalance between the mean value of the absolute value of the current value of the phase that maximum current flows through in the electric current flowing through three-phase and the electric current of whole three-phase, and based on described amount of unbalance, limits the running of described inverter.
According to control device of electric motor of the present invention, can provide and equipment can need not be made when unbalanced power supply as far as possible to stop and the control device of electric motor of transducer can be protected.
Accompanying drawing explanation
Fig. 1 is the key diagram of the control device of electric motor of the first execution mode.
Fig. 2 is the key diagram of the effect of the first execution mode.
Fig. 3 is the key diagram of the control device of electric motor of the second execution mode.
Fig. 4 is the key diagram of the effect of the second execution mode.
Description of reference numerals
1 control device of electric motor
3 motor
5 encoders
7 controllers
93 cross streams power supplys
11 control parts
13 transducers
15 inverters
17 electrolytic capacitors
19 regeneration resistance section
19a regenerative semiconductor
19b regenerates resistance
110 test sections
111 maximum current calculating parts
112 first comparing sections
113 speed command rate of change limit portions
114 speed controlling portions
115 torque control divisions
116 grid control parts
117 first storage parts
118 acceleration detecting section
119 speed detecting portion
120 power run/regenerate changing unit
121 regenerative switches
122 power run switchs
123 transducer grid control parts
124 reproduction control unit
131 selector portions
132 equalization part
133aR active power value calculating part
133bS active power value calculating part
133cT active power value calculating part
134 imbalance compensation amount calculating parts
135 multiplication calculating parts
136 cumulative unit
137 second comparing sections
138 second storage parts
139 the 3rd comparing sections
140 the 3rd storage parts
150 phase-detection portions.
In the following detailed description, for purposes of illustration, in order to provide the understanding thoroughly to disclosed execution mode, many concrete details are proposed.But, obviously can implement one or more execution modes under the prerequisite not having these details.In other cases, in order to simplify drawing, schematically show known construction and device.
Embodiment
< first execution mode >
Below, the first execution mode is described.Fig. 1 is the key diagram of the control device of electric motor 1 of the first execution mode.Fig. 2 is the key diagram of the effect of the first execution mode.
As shown in Figure 1, control device of electric motor 1 accepts the supply of alternating electromotive force from the three-phase alternating-current supply 9 of outside.Three-phase alternating-current supply 9 provides the three-phase ac power of R phase, S-phase and T-phase to control device of electric motor 1.In addition, control device of electric motor 1 drive motor 3.More particularly, motor 3 is the three-phase alternating-current motors utilizing the three-phase ac power inputted from control device of electric motor 1 to drive.Motor 3 is such as various equipment (not shown).Encoder 5 is utilized to detect the rotation of motor 3.The rotation (speed) of the motor 3 detected inputs control device of electric motor 1.Control device of electric motor 1 such as utilizes method described later to implement feedback.In addition, control device of electric motor 1 inputs various information described later (alarm signal, abnormal signal) to controller 7.Controller 7 exports various command signal (speed command signal) to control device of electric motor 1.
Control device of electric motor 1 has: control part 11, transducer 13, inverter 15 and electrolytic capacitor 17.
Transducer 13 accepts the alternating current of three-phase from three-phase alternating-current supply 9.Transducer 13 utilizes multiple semiconductor element that three-phase alternating current is converted to direct current.In addition, in the first embodiment, as multiple semiconductor element, transducer 13 has six diodes.But the kind of the semiconductor element of transducer 13 and quantity are not limited to illustrational kind and quantity.
Utilize a circuit to connect transducer 13 and inverter 15.Further, foregoing circuit is connected with the electrolytic capacitor 17 of the equalization for realizing direct voltage.
The direct current provided by transducer 13 is converted to the alternating current for drive motor 3 by inverter 15.Above-mentioned inverter 15 controls the velocity of rotation etc. of motor 3.In addition, in the present embodiment, three-phase alternating-current motor is used as motor 3.Be not limited to three-phase alternating-current motor as motor 3, also can use other various motor (such as DC motor).
The control utilizing control part 11 to carry out below is described.Control part 11 has test section 110.Test section 110 detects the current value flowing through the electric current of R phase, S-phase and T-phase.At this, the current value of the R phase detected by test section 110 is called R value, the current value of S-phase is called S value, the current value of T-phase is called T value.The R value detected, S value and T value three value input maximum current calculating parts 111 and selector portion 131.In addition, R value input R active power value calculating part 133a.S value input S active power value calculating part 133b.T value input T active power value calculating part 133c.
The value (hereinafter referred to as " maximum ") in the R value of input, S value and T value three values with maximum value exports to the first comparing section 112 by maximum current calculating part 111.The maximum of input and the setting 1 be stored in the first storage part 117 compare by the first comparing section 112.Further, when maximum is larger than setting 1, the first comparing section 112 will represent that the signal (hereinafter referred to as " restricting signal ") of above-mentioned information exports to speed command rate of change limit portion 113.In addition, if maximum is setting less than 1, then the first comparing section 112 makes the output of restricting signal stop.
When not inputting the restricting signal from the first comparing section 112, the command value (hereinafter referred to as " speed value ") of the speed inputted from controller 7 exports directly to speed controlling portion 114 by speed command rate of change limit portion 113.On the other hand, when have input the restricting signal from the first comparing section 112, speed command rate of change limit portion 113 becomes the mode of part (such as 1/4 or 1/5) with the accekeration of the motor 3 inputted from acceleration detecting section 118, the rate of change of restriction (correction) speed value, and above-mentioned speed value is exported to speed controlling portion 114.In addition, speed value (speed command) also can as the signal for control inverter 15.
At this, the part of the control carrying out motor 3 is described.The rotation of motor 3 utilizes encoder 5 be converted to the signal of telecommunication (hereinafter referred to as " motor turn signal ") and export to speed detecting portion 119.Speed detecting portion 119 is by carrying out to the pulse signal (such as motor turn signal) from motor 3 speed that differential etc. carrys out calculating motor 3.The value calculated (hereinafter referred to as " velocity amplitude ") exports to speed controlling portion 114 and acceleration detecting section 118 by speed detecting portion 119.Acceleration detecting section 118 calculates acceleration by carrying out differential etc. to the velocity amplitude of input.The value calculated (hereinafter referred to as " accekeration ") exports to speed command rate of change limit portion 113 by acceleration detecting section 118.
Speed controlling portion 114 by the calculating torque instruction (hereinafter referred to as " motor torque command value ") that the difference of velocity amplitude and speed value and compensating gain is multiplied, and exports to torque control division 115.Torque control division 115 by calculate for realize motor torque command value, the voltage instruction value that flows through motor 3, carry out Current Control.Torque control division 115 (current control division), by carrying out pulse-width modulation (PWM) to above-mentioned voltage instruction value (hereinafter referred to as " motor voltage command value "), generates signal.Above-mentioned signal exports to grid control part 116 by torque control division 115.Grid control part 116, based on above-mentioned signal, controls the semiconductor forming inverter 15.By utilizing above-mentioned grid control part 116 suitably control inverter 15, the rotation of motor 3 is controlled.In addition, if input grid stop signal from the 3rd comparing section 139 described later, then grid control part 116 makes to stop from inverter 15 to the supply of the electric power of motor 3.
Selector portion 131 selects the current value of R phase, S-phase and T-phase and exports to equalization part 132.Equalization part 132 calculates the mean value (hereinafter referred to as " mean value ") of the current value of three-phase current and exports to multiplication calculating part 135.
R active power value calculating part 133a calculates the active power value (hereinafter referred to as " R phase active power value ") of the current value of R phase and exports to imbalance compensation amount calculating part 134.S active power value calculating part 133b calculates the active power value (hereinafter referred to as " S-phase active power value ") of the current value of S-phase and exports to imbalance compensation amount calculating part 134.T active power value calculating part 133c calculates the active power value (hereinafter referred to as " T-phase active power value ") of the current value of T-phase and exports to imbalance compensation amount calculating part 134.
Further, imbalance compensation amount calculating part 134 calculates mean value (first mean value of three-phase current according to R phase active power value, S-phase active power value and T-phase active power value.The such as mean value of active power value).In addition, imbalance compensation amount calculating part 134 calculates (selection) maximum active power value according to R phase active power value, S-phase active power value and T-phase active power value.On this basis, imbalance compensation amount calculating part 134 can utilize the mean value of maximum active power value (or flowing through the absolute value (maximum value) of electric current of the phase that maximum current flows through) and three-phase current, calculating current imbalance compensation amount.Imbalance compensation amount calculating part 134 such as utilizes following formula, calculating current imbalance compensation amount.
Current imbalance compensation rate=| maximum active power value |/| the mean value of three-phase current |
The current imbalance compensation rate calculated exports to multiplication calculating part 135.In addition, not only can utilize active power value but also mean value can be utilized to carry out calculating current imbalance compensation amount.
The value (multiplication calculated value) obtained by carrying out multiplication calculating to above-mentioned current imbalance compensation rate and the mean value (the second mean value) that exports from equalization part 132 exports to cumulative unit 136 by multiplication calculating part 135.The value (hereinafter referred to as " aggregate-value ") that multiplication calculated value by accumulative input obtains by cumulative unit 136 exports to the second comparing section 137 and the 3rd comparing section 139.
The aggregate-value of input and the setting 2 be stored in the second storage part 138 compare by the second comparing section 137.When aggregate-value is higher than setting 2, the second comparing section 137 will represent that the signal (hereinafter referred to as " alarm signal ") of above-mentioned information exports to controller 7.
The aggregate-value of input and the setting 3 be stored in the 3rd storage part 140 compare by the 3rd comparing section 139.Further, when aggregate-value is higher than setting 3, will represent that the signal (hereinafter referred to as " grid stop signal ") of above-mentioned information exports to grid control part 116.When aggregate-value is higher than setting 3, the 3rd comparing section 139 exports grid stop signal, and will represent that the signal (hereinafter referred to as " abnormal signal ") that have issued grid stop signal exports to controller 7.
At this, be set as that the value of setting 2 is following values: when aggregate-value is less than afore mentioned rules value 2, the imbalance of the electric current flowing through three-phase be considered as to produce dysgenic state (running can be considered as steady running) to the running of motor 3.In other words, if aggregate-value becomes the value of setting more than 2, then utilize controller 7 to carry out correspondence (hereinafter referred to as " uneven corresponding ").In addition, be set as that the value of setting 3 is following values: when aggregate-value is in afore mentioned rules value more than 3, the imbalance of the electric current flowing through three-phase is considered as the abnormality preferably making motor 3 stop.Therefore, setting 2 < setting 3.
Then, the action of controller 7 is described.Controller 7 is components of input etc. (operation input) the Comprehensive Control motor 3 accepted from user.Above-mentioned controller 7 exports inputting corresponding speed value with operation to speed command rate of change limit portion 113 usually.But when have input alarm signal, it is corresponding that controller 7 carries out warning.Specifically, in this case, controller 7 such as makes the dwell time of the drive manner of motor elongated.In addition, such as, when inputting abnormal signal, controller 7 is by above-mentioned message notice user.
In the control device of electric motor 1 with structure described above, can prevent or suppress overcurrent to flow through transducer 13 and make the semiconductor in transducer 13 damaged.In addition, can not only prevent or suppress the bad phenomenon because overcurrent produces, can also prevent or suppress the breakage because the overload in transducer 13 causes.Below, be more specifically described.
The restricting signal that speed command rate of change limit portion 113 utilizes the detected value based on maximum current calculating part 111 to produce, the rate of change of the speed value of restrictions motor 3.Thus, as shown in Figure 2, exceed a time point of setting (such as setting 1) at the electric current flowing through transducer 13, the output from speed command rate of change limit portion 113 becomes the part B value of above-mentioned A value from A value so far.Thus, the climbing of motor 3 speed declines.In addition, the electric current flowing through transducer 13 also declines gradually.Thus, the maximum flowing through the electric current of transducer 13 does not exceed setting.Therefore, the semiconductor in transducer 13 can be suppressed damaged.Thereby, it is possible to the running of motor 3 need not be made to stop and continuing to operate.Further, the Nonstop running of motor 3 only only refers to the Nonstop running of the various equipment using motor 3.In addition, the electric current of maximum current calculating part 111 phase of selecting maximum current to flow through.Therefore, even if when flowing through the current-unbalance of three-phase, the electric current flowing through transducer 13 can also be limited.Thus, even if when flowing through the current-unbalance of three-phase, motor 3 and equipment also can be made to stop, and transducer 13 can be protected.
In addition, R active power value calculating part 133a, S active power value calculating part 133b and T active power value calculating part 133c calculates active power value (electric current), the imbalance compensation amount of imbalance compensation amount calculating part 134 calculating current.Thereby, it is possible to compensate the imbalance of the electric current flowing through R phase, S-phase and T-phase three-phase.Thus, even if when flowing through the current-unbalance of three-phase, motor 3 and equipment also can be made to stop, and transducer 13 can be protected.
In addition, current value when afore mentioned rules value (such as setting 1) can be the restriction of the rate of change not carrying out the speed command implemented by control part 11.
In the present embodiment, control part 11 carries out current absolute value control and unbalance control.That is, control part 11 carries out current absolute value control, and based on the value of electric current flowing through three-phase, the absolute value making to flow through the electric current of the phase that maximum current flows through in the electric current of three-phase is in larger than zero and below setting scope.In addition, control part 11 carries out unbalance control, calculate the amount of unbalance of the mean value of the absolute value of the value of the electric current of the phase that maximum current flows through in the electric current flowing through three-phase and the electric current of whole three-phase, and based on described amount of unbalance, limit the running of described inverter.But be not limited to this, control part 11 also can carry out any one in current absolute value control and unbalance control.
Control part 11 based on the current imbalance compensation rate calculated by imbalance compensation amount calculating part 134, can detect the overload of transducer 13.Control part 11 is compared with setting 2 by the value (multiplication calculated value) obtained carrying out multiplication calculating to current imbalance compensation rate and the mean value (the second mean value) that exports from equalization part 132, detect the overload of transducer 13, when detecting the overload of transducer 13, carry out alarm correspondence.
Control part 11 by the value (multiplication calculated value) of current imbalance compensation rate and the second mean value being carried out to multiplication calculating being compared with setting 3, can detect abnormality, when detecting abnormality, and the running of restriction inverter 15.
< second execution mode >
Fig. 3 is the key diagram of the control device of electric motor 1 of the second execution mode.Fig. 4 is the key diagram of the effect of the second execution mode.In addition, explanation is eliminated to the point identical with the first execution mode.
The difference of the second execution mode and the first execution mode is as described below.In this second embodiment, same with the first execution mode, provide the electric current from three-phase alternating-current supply 9 to motor 3.In addition, in this second embodiment, the electric current from motor 3 regenerates to three-phase alternating-current supply 9.Therefore, the transducer 13 of the second execution mode not only comprises diode, also comprises the semiconductor (power transistor) utilizing the voltage input to grid to control.Power MOSFET (mos field effect transistor) or insulated gate bipolar transistor (IGBT) is such as used as semiconductor (power transistor).Thereby, it is possible in the circuit comprising transducer 13 and inverter 15, the rotatory force of motor 3 is regenerated as electric power.In addition, grid control part 116 is corresponding with the rotation of motor 3, suitably the semiconductor (power transistor) of control inverter 15.In addition, in R phase, S-phase and T-phase, ACL10 is provided with.
In addition, equally, the direct current that the circuit that transducer grid control part 123 subtend comprises transducer 13 and inverter 15 provides controls, and regenerates in R phase, S-phase and T-phase to make above-mentioned electric current with suitable phase place.In addition, in order to the electric current making transducer grid control part 123 regenerate suitable phase place, the phase place of R phase, S-phase and T-phase is detected in phase-detection portion 150.Further, transducer grid control part 123, based on the phase place of each phase exported from phase-detection portion 150, controls the semiconductor (power transistor) of transducer 13.
In addition, in the circuit comprising transducer 13 and inverter 15, be provided with regeneration resistance section 19.Above-mentioned regeneration resistance section 19 has regeneration resistance 19b and regenerative semiconductor 19a (power transistor).Regeneration resistance 19b has the ability that can be heat by the electrical sink utilizing motor 3 to regenerate.If provide voltage to above-mentioned grid, then regenerative semiconductor 19a (power transistor) can make electric current flow through regeneration resistance section 19.Reproduction control unit 124 is utilized to control to supply to the voltage of above-mentioned regenerative semiconductor 19a (power transistor) grid.
In addition, control part 11 has power and runs/regenerate changing unit 120.Above-mentioned power runs/regenerates the ON/OFF that changing unit 120 switches regenerative switch 121 and power run switch 122.More particularly, power runs/regenerates changing unit 120 and makes regenerative switch 121 conducting when regenerating and power run switch 122 is disconnected.In addition, power runs/regenerates changing unit 120 and makes when power runs regenerative switch 121 disconnect and make power run switch 122 conducting.
Thus, when power runs and when regenerating, different control is carried out.At this, when power runs, carry out the control identical with the first execution mode.On the other hand, during regeneration, controlled by transducer grid control part 123 and reproduction control unit 124.
More particularly, during regeneration, when the electric current of the phase that maximum current flows through is less than setting (being stored in the setting 1 in the first storage part 117), the electric current regenerated from motor 3 regenerates to three-phase alternating-current supply 9.On the other hand, when the electric current of the phase that maximum current flows through is more than setting (being stored in the setting 1 in the first storage part 117), transducer grid control part 123 such as controls transducer 13, does not regenerate.In addition, in this case, reproduction control unit 124 such as controls regenerative semiconductor 19a, flows through regeneration resistance section 19 (regeneration resistance 19b) to make the electric current regenerated from motor 3.Thus, the electric current regenerated from motor 3 is reproduced resistance 19b and consumes as heat.Thereby, it is possible to the electric current controlling the phase that maximum current flows through is no more than setting.
Then, utilize Fig. 4, the effect of the second execution mode is described.In addition, below, what suppose that maximum current flows through is R phase mutually.As shown in Figure 4, until c time point, the electric current flowing through R phase does not arrive setting (such as setting 1).Therefore, the electric current flow through in transducer 13 is not limited in.But at c time point, the electric current flowing through R phase arrives setting.Therefore, transducer grid control part 123 makes the regeneration to three-phase alternating-current supply 9 undertaken by transducer 13 stop.Meanwhile, reproduction control unit 124 such as controls regenerative semiconductor 19a, flows through in regeneration resistance section 19 (regeneration resistance 19b) to make electric current.Thus, the electric current flowing through R phase declines.
Reproduction control unit 124 continues to make the electric current of regeneration to flow through in regeneration resistance section 19 within the stipulated time (regenerating 1 impulse duration of resistance IGBT control signal in Fig. 4).Further, the d time point after have passed through the stipulated time, removes the restriction of regeneration.Thus, the electric current of R phase rises again.Further, repeatedly above-mentioned action is carried out.Correspondingly with the value of electric current can carry out above-mentioned process.
Owing to carrying out above-mentioned control, so not only when power runs, even if during regeneration, the running of motor 3 also can be made to stop and making it continue.Further, the Nonstop running of motor 3 only only refers to the Nonstop running of the various equipment using motor 3.In addition, maximum current calculating part 111 selects the electric current flowing through the phase of maximum current.Therefore, even if when flowing through the current-unbalance of three-phase, the electric current flowing through transducer 13 can also be limited.Thus, even if when flowing through the current-unbalance of three-phase, motor 3 and equipment also can be made to stop, and transducer 13 can be protected.
The structure of < execution mode and effect >
The control device of electric motor 1 of present embodiment has: transducer 13, is electrically connected with three-phase alternating-current supply 9; Inverter 15, is electrically connected with transducer 13 and motor 3; And control part 11, detect the electric current flow through between three-phase alternating-current supply 9 and transducer 13, and control inverter 15.Control part 11 controls based on the value of the electric current flowing through three-phase, and the current value (such as absolute value) making to flow through the phase that maximum current flows through in three-phase becomes larger than zero and below setting scope.In the control device of electric motor 1 with said structure, when unbalanced power supply, motor 3 and equipment can need not be made as far as possible to stop, and can transducer be protected.In addition, the semiconductor (power transistor) of the transducer 13 be connected with three-phase alternating-current supply 9 can be protected.
In addition, control part 11 controls, and by the rate of change of the speed command of restrictions motor 3, the current value (such as absolute value) making to flow through the phase that maximum current flows through in three-phase becomes below setting.In the control device of electric motor 1 with this structure, while maintenance motor 3 rotates, can protect the semiconductor (power transistor) of transducer 13.
In addition, the circuit connecting transducer 13 and inverter 15 has regeneration resistance section 19.During regeneration, when the current value (such as absolute value) flowing through the phase that maximum current in three-phase flows through becomes more than setting, control part 11 cuts off the electric current of the regeneration from transducer 13 to three-phase alternating-current supply, and makes electric current flow through regeneration resistance section 19.In the control device of electric motor 1 with this structure, even if during regeneration, also can while maintenance motor 3 rotate, the semiconductor (power transistor) of protection transducer 13.
In addition, control part 11 calculates the amount of unbalance flowing through the mean value of the current value (such as absolute value) of the phase that maximum current in three-phase flows through and the electric current of whole three-phase.In addition, control part 11 limits the running of inverter 15 based on amount of unbalance.In the control device of electric motor 1 with this structure, produce imbalance even if flow through in the electric current of three-phase, also can suppress above-mentioned imbalance, and running can be made to continue.
In addition, the present invention is not limited to above-mentioned execution mode.Other execution modes of the present invention can have structure and/or the formation of various change, also can carry out the various control changed.Program such as can be utilized to carry out the control of control part 11.In addition, test section 110 can detect the whole current values flowing through three-phase.In addition, test section 110 can detect the current value flowing through two-phase, and by calculating the current value calculating other phases.As long as interchange can be converted to direct current, transducer of the present invention can have arbitrary structures.As long as direct current can be converted to interchange, and can utilize the final drive motor of above-mentioned alternating current (alternating electromotive force), inverter of the present invention can have arbitrary structures.
Torque control division 115 calculate voltage instruction value that the motor 3 in order to realize required for motor torque command value should export and carry out Current Control, the voltage instruction (motor voltage command value) from current control division can be exported to grid control part 116.Or, torque control division 115 calculate the current instruction value that should flow in the voltage instruction value that should export at the motor 3 in order to realize required for motor torque command value and carry out Current Control, pulse-width modulation (PWM) can be carried out to the voltage instruction (motor voltage command value) from current control division, and export to grid control part 116 as signal.
Imbalance compensation amount calculating part 134 can calculate the current value (active power value) of maximum current in three-phase according to R phase active power value, S-phase active power value and T-phase active power value.
Motor 3 can be from control device of electric motor 1 accept three-phase interchange input and drive three-phase alternating-current motor.On this basis, following formula can be utilized, calculating current imbalance compensation amount.Current imbalance compensation rate=| electric current is the current value of maximum phase |/| the mean value of three-phase current |
Setting 2 can be set as following value: the imbalance flowing through the electric current of three-phase when aggregate-value is less than afore mentioned rules value 2 is considered as producing any problem and can steady running.Setting 3 can be set as following value: aggregate-value flows through the electric current of three-phase imbalance when afore mentioned rules value more than 3 is considered as making motor 3 stop the abnormality of degree.
Control part 11 can control based on the current value flowing through three-phase, makes to flow through the current value of the phase of lowest high-current value in the electric current of three-phase, in non-vanishing scope below setting.
Control part 11 can control, and by the rate of change of the speed command of restrictions motor 3, the current value making to flow through the phase of lowest high-current value in the electric current of three-phase becomes below setting.
During regeneration, when the current value of the phase of lowest high-current value in the electric current flowing through three-phase becomes more than setting, control part 11 cuts off the connection from transducer 13 to three-phase alternating-current supply, and makes electric current flow through regeneration resistance section 19.
Control part 11 can calculate the amount of unbalance between the mean value of the current value of the phase of lowest high-current value in the electric current flowing through three-phase and the electric current of whole three-phase, and based on amount of unbalance, the running of restriction inverter 15.Program can be utilized to carry out the control of control part 11.
The present invention alternatively relates to a kind of protection of transducer of control device of electric motor.
Present embodiment can be the following control device of electric motor of the first ~ four.The control device of electric motor of first has: transducer, is electrically connected with three-phase alternating-current supply; Inverter, is connected with described transducer and electric electromechanics; And control part, detect the electric current flow through between described three-phase alternating-current supply and described transducer, and described inverter is controlled, described control part controls based on the value of the electric current flowing through three-phase, make to flow through the absolute value of the current value of the phase of lowest high-current value in the electric current of three-phase, in non-vanishing scope, be in below setting.The control device of electric motor of second is on the basis of the first control device of electric motor, described control part controls, by limiting the rate of change of the speed command of described motor, make to flow through the absolute value of the current value of the phase of lowest high-current value in the electric current of three-phase below setting.The control device of electric motor of the 3rd is on the basis of the first or second control device of electric motor, in the circuit connecting described transducer and described inverter, there is regeneration resistance section, during regeneration, when the absolute value of the current value of the phase of lowest high-current value in the electric current flowing through three-phase is more than setting, described control part cuts off from described transducer to the connection of described three-phase alternating-current supply, and makes electric current flow through described regeneration resistance section.On the basis of control device of electric motor any one control device of electric motor in the first ~ three of the 4th, described control part calculates the amount of unbalance between the mean value of the electric current of absolute value and the whole three-phase flowing through the current value of the phase of lowest high-current value in the electric current of three-phase, and based on described amount of unbalance, limit the running of described inverter.According to the control device of electric motor of the first ~ four, equipment need not be made when can be provided in unbalanced power supply as far as possible to stop and the control device of electric motor of transducer can be protected.
Present embodiment can be the following control device of electric motor of the five ~ nine.The control device of electric motor of the 5th has: transducer, is electrically connected with three-phase alternating-current supply; Inverter, is connected with described transducer and electric electromechanics; And control part, detect the electric current flow through between described three-phase alternating-current supply and described transducer, and described inverter is controlled, described control part utilizes in the electric current of the three-phase flow through between described three-phase alternating-current supply and described transducer, flows through the first mean value of the absolute value of the current value of the phase of lowest high-current value and the electric current of described three-phase, calculate current imbalance compensation rate, and utilize described current imbalance compensation rate, detect the overload of described transducer.
The control device of electric motor of the 6th is on the basis of the first control device of electric motor, described control part is compared by the value and the first setting of the second mean value of the electric current to described current imbalance compensation rate and described three-phase being carried out multiplication calculating, detect the overload of described transducer, when detecting the overload of described transducer, carry out alarm correspondence.
The control device of electric motor of the 7th is on the basis of the second control device of electric motor, described control part is compared by the value and the second setting of described second mean value of the electric current to described current imbalance compensation rate and described three-phase being carried out multiplication calculating, detect abnormality, when detecting described abnormality, limit the running of described inverter.
The control device of electric motor of the 8th is on the basis of three-motor control device, and described second setting is larger than described first setting.
The control device of electric motor of the 9th has: transducer, is electrically connected with three-phase alternating-current supply; Inverter, is connected with described transducer and electric electromechanics; And control part, detect the electric current flow through between described three-phase alternating-current supply and described transducer, and described inverter is controlled, described control part controls based on the current value flow through between described three-phase alternating-current supply and described transducer, by restriction for controlling the rate of change of speed command of the described motor of described inverter, making to flow through in the electric current between described three-phase alternating-current supply and described transducer, to flow through the absolute value of the current value of the phase of lowest high-current value little when non-vanishing scope internal ratio does not carry out described restriction.
In the control device of electric motor of the 9th, carrying out Current Control and under control situation is carried out to the torque of motor, can equipment need not made when unbalanced power supply as far as possible to stop, and can transducer be protected.
Object for example and explanation has given described detailed description.According to instruction above, many distortion and change are all possible.Described detailed description is not omitted or is intended to limit the theme illustrated here.Although be illustrated described theme with distinctive architectural feature and/or procedure by word, should be understood that, the theme defined in claims is not to be limited to described specific features or detailed process.Or rather, described specific features and detailed process are illustrated as the example implementing the claims book.
Claims (5)
1. a control device of electric motor, is characterized in that comprising:
Transducer, is electrically connected with three-phase alternating-current supply;
Inverter, is connected with described transducer and electric electromechanics; And
Control part, detects the electric current flow through between described three-phase alternating-current supply and described transducer, and controls described inverter,
Described control part controls, and based on the value of electric current flowing through three-phase, the absolute value making to flow through the electric current of the phase that maximum current flows through in the electric current of three-phase is in larger than zero and below setting scope.
2. control device of electric motor according to claim 1, it is characterized in that, described control part controls, and by limiting the rate of change of the speed command of described motor, makes to flow through the absolute value of the current value of the phase that maximum current flows through in the electric current of three-phase below setting.
3. control device of electric motor according to claim 1, is characterized in that,
Described control device of electric motor also has regeneration resistance section, and described regeneration resistance section is configured in the circuit connecting described transducer and described inverter,
During regeneration, when the absolute value of the current value of the phase that maximum current in the electric current flowing through three-phase flows through becomes more than setting, described control part cuts off the electric current regenerated to described three-phase alternating-current supply from described transducer, and makes electric current flow through described regeneration resistance section.
4. control device of electric motor according to claim 2, is characterized in that,
Described control device of electric motor also has regeneration resistance section, and described regeneration resistance section is configured in the circuit connecting described transducer and described inverter,
During regeneration, when the absolute value of the current value of the phase that maximum current in the electric current flowing through three-phase flows through becomes more than setting, described control part cuts off the electric current regenerated to described three-phase alternating-current supply from described transducer, and makes electric current flow through described regeneration resistance section.
5. according to the control device of electric motor in Claims 1 to 4 described in any one, it is characterized in that, described control part calculates the amount of unbalance between the mean value of the electric current of absolute value and the whole three-phase flowing through the current value of the phase that maximum current flows through in the electric current of three-phase, and based on described amount of unbalance, limit the running of described inverter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014199020A JP5839374B1 (en) | 2014-09-29 | 2014-09-29 | Motor control device |
| JP2014-199020 | 2014-09-29 |
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| Publication Number | Publication Date |
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| CN105471358A true CN105471358A (en) | 2016-04-06 |
| CN105471358B CN105471358B (en) | 2019-05-03 |
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| CN201510572450.2A Active CN105471358B (en) | 2014-09-29 | 2015-09-10 | Control device of electric motor |
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| Country | Link |
|---|---|
| JP (1) | JP5839374B1 (en) |
| CN (1) | CN105471358B (en) |
| PH (1) | PH12015000334A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109983650A (en) * | 2016-11-08 | 2019-07-05 | 松下知识产权经营株式会社 | Electrical power transmission system |
| CN112636650A (en) * | 2020-11-27 | 2021-04-09 | 上海汽车集团股份有限公司 | New forms of energy electric truck motor controller speed governing system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101040428A (en) * | 2004-10-04 | 2007-09-19 | 大金工业株式会社 | Power supply circuit protecting method and apparatus for the same |
| CN101884164A (en) * | 2007-12-04 | 2010-11-10 | 三菱电机株式会社 | Ac motor controller |
| CN102055369A (en) * | 2009-11-04 | 2011-05-11 | 山洋电气株式会社 | Power supply device for driving electric motor |
| JP2014064447A (en) * | 2012-08-30 | 2014-04-10 | Mitsubishi Heavy Ind Ltd | Converter control device, method and program, and air conditioner |
-
2014
- 2014-09-29 JP JP2014199020A patent/JP5839374B1/en active Active
-
2015
- 2015-09-10 CN CN201510572450.2A patent/CN105471358B/en active Active
- 2015-09-29 PH PH12015000334A patent/PH12015000334A1/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101040428A (en) * | 2004-10-04 | 2007-09-19 | 大金工业株式会社 | Power supply circuit protecting method and apparatus for the same |
| CN101884164A (en) * | 2007-12-04 | 2010-11-10 | 三菱电机株式会社 | Ac motor controller |
| CN102055369A (en) * | 2009-11-04 | 2011-05-11 | 山洋电气株式会社 | Power supply device for driving electric motor |
| JP2014064447A (en) * | 2012-08-30 | 2014-04-10 | Mitsubishi Heavy Ind Ltd | Converter control device, method and program, and air conditioner |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109983650A (en) * | 2016-11-08 | 2019-07-05 | 松下知识产权经营株式会社 | Electrical power transmission system |
| CN112636650A (en) * | 2020-11-27 | 2021-04-09 | 上海汽车集团股份有限公司 | New forms of energy electric truck motor controller speed governing system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105471358B (en) | 2019-05-03 |
| JP5839374B1 (en) | 2016-01-06 |
| PH12015000334A1 (en) | 2017-10-02 |
| JP2016073065A (en) | 2016-05-09 |
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