CN112311294A - Permanent magnet synchronous motor controller for washing machine - Google Patents
Permanent magnet synchronous motor controller for washing machine Download PDFInfo
- Publication number
- CN112311294A CN112311294A CN202011285280.7A CN202011285280A CN112311294A CN 112311294 A CN112311294 A CN 112311294A CN 202011285280 A CN202011285280 A CN 202011285280A CN 112311294 A CN112311294 A CN 112311294A
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- unit
- resistor
- operational amplifier
- washing machine
- current
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- 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
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/022—Synchronous motors
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- 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
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- 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
- H02P6/28—Arrangements for controlling current
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- 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
- H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
- H02P2207/05—Synchronous machines, e.g. with permanent magnets or DC excitation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Washing Machine And Dryer (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention discloses a permanent magnet synchronous motor controller for a washing machine, belongs to the technical field of washing machines, and aims to overcome the defect that an inverter of the existing washing machine controller is easy to distort sampled current signals. The controller comprises a microcontroller digital operation unit, an inversion unit and a current sampling unit, wherein the current sampling unit comprises an anti-distortion processing circuit, the current sampling unit collects three-phase lower bridge arm current signals of the inversion unit and sends the current signals into the microcontroller digital operation unit after anti-distortion processing is carried out on the current signals through the anti-distortion processing circuit, and the microcontroller digital operation unit forms high-frequency carrier PWM signals for auxiliary driving of the inversion unit. The anti-distortion processing circuit is arranged on the current sampling unit, so that the distortion degree of a current signal received by the digital operation unit of the microcontroller from the inverter unit can be reduced, the accuracy of the current signal is improved, and the control accuracy of the controller is improved.
Description
Technical Field
The invention belongs to the technical field of washing machines, and relates to a permanent magnet synchronous motor controller for a washing machine.
Background
The existing washing machine generally adopts a controller to control the working modes of the washing machine, such as a dehydration mode and a washing mode, the controller comprises a microcontroller digital operation unit, an inversion unit and a current sampling unit connected between the microcontroller digital operation unit and the inversion unit, the current sampling unit samples the current of the inversion unit and transmits a current sampling signal to the microcontroller digital operation unit so as to assist the microcontroller digital operation unit to control the inversion unit. Because the transmission distance from the inverter unit to the digital operation unit of the microcontroller is long, the current sampling signal is easily interfered in the transmission process, and the control performance of the whole washing machine control system is easily reduced.
Disclosure of Invention
The invention provides a permanent magnet synchronous motor controller for a washing machine aiming at the problems in the prior art and aims to overcome the defect that the inverter sampling current signal of the conventional washing machine controller is easy to distort.
The invention is realized by the following steps:
a permanent magnet synchronous motor controller for a washing machine, comprising:
the microcontroller digital arithmetic unit is used for controlling the starting, stopping and running modes of the washing machine motor;
the inverter unit generates a high-frequency modulation carrier signal according to a driving signal of the digital arithmetic unit of the microcontroller to drive the motor to work;
the current sampling unit comprises an anti-distortion processing circuit, the current sampling unit collects three-phase lower bridge arm current signals of the inversion unit and sends the current signals into the micro-controller digital operation unit after anti-distortion processing is carried out on the current signals through the anti-distortion processing circuit, and the micro-controller digital operation unit forms high-frequency carrier PWM signals for auxiliary driving of the inversion unit.
The anti-distortion processing circuit comprises a non-inverting terminal input unit, an operational amplifier main body unit, an operational amplifier feedback unit and an output signal processing unit; the in-phase input unit is connected between the inversion unit and the in-phase input end of the operational amplifier main body unit, the operational amplifier feedback unit is connected between the inverting input end of the operational amplifier main body unit and the output end of the operational amplifier main body unit, and the output signal processing unit is connected between the output end of the operational amplifier main body unit and the microcontroller digital operation unit.
The in-phase terminal input unit comprises a resistor R1, a resistor R2 and a resistor R3 which are sequentially connected in series, the resistor R3 is connected with an electronic switch K1 in parallel, and the common point of the resistor R1 and the resistor R2 is connected with the in-phase input terminal of the operational amplifier main body unit; the operational amplifier feedback unit comprises a capacitor C2, a resistor R5 and a resistor R6 which are connected in series, the resistor R6 is connected with an electronic switch K2 in parallel, one end of the capacitor C2 is connected to the common point of the resistor R5 and the inverting input end of the operational amplifier feedback unit, the other end of the capacitor C2 is connected to the common point of the resistor R6 and the output end of the operational amplifier main body unit, the inverting input end of the operational amplifier main body unit is grounded through R4, and the electronic switch K1 and the electronic switch K2 are connected with the microcontroller digital operation unit in common.
The in-phase terminal input unit is powered by a 1.65V pull-up bias power supply, a positive side power supply pin of the operational amplifier main body unit is connected with a 3.3V power supply, and a negative side power supply pin of the operational amplifier main body unit is grounded.
The resistances R1-R6 are governed by the following relationship:
r1= R4, R3= R6= (k-1) × R2= (k-1) × R5, wherein k has a value of 1-7.
The non-inverting input cell includes a capacitor C1 connected to ground.
The output signal processing unit comprises a resistor R7 and a capacitor C3 connected to ground.
The controller further includes:
the power input unit is used for providing a single-phase mains supply interface for the controller;
the main loop unit is used for carrying out buffering processing, EMC processing, sorting processing and smoothing processing on an input power supply;
the bus sampling unit is used for collecting the bus voltage of the controller in the current state;
the LDO circuit unit is used for carrying out two-stage voltage reduction on the bus voltage subjected to the flat wave processing to obtain a 15V power supply signal and a 3.3V power supply signal and providing a non-isolated weak current power supply signal for the controller;
the communication control unit is used for the instruction interaction between the user upper computer and the microcontroller digital operation unit;
and the program programming unit is used for the instruction interaction between the manufacturer upper computer and the microcontroller digital operation unit.
The main circuit unit comprises a current-limiting resistor and a relay connected in parallel with the current-limiting resistor, and the relay is connected with the microcontroller digital operation unit.
The inversion unit comprises an intelligent power module IPM and a back-mounted radiator, and the intelligent power module IPM is fixed on the radiator and welded on the PCB together.
According to the permanent magnet synchronous motor controller for the washing machine, the anti-distortion processing circuit is arranged on the current sampling unit, so that the distortion degree of a current signal received by the digital operation unit of the microcontroller from the inverter unit can be reduced, the accuracy of the current signal is improved, and the control accuracy of the controller is improved.
Drawings
FIG. 1 is a schematic diagram of a topology of a controller;
fig. 2 is a schematic circuit diagram of the anti-aliasing processing circuit.
Reference is made to the accompanying drawings in which: u9-1, input interface unit; u9-2, a non-inverting terminal input unit; u9-3, operational amplifier main body unit; u9-4, an operational amplifier feedback unit; u9-5, an output signal processing unit; u9-6, output interface unit.
Detailed Description
The following detailed description of the embodiments of the present invention is provided in connection with the accompanying drawings for the purpose of facilitating understanding and understanding of the technical solutions of the present invention. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment provides a permanent magnet synchronous motor controller for a washing machine, which comprises a microcontroller digital operation unit, an inversion unit, a current sampling unit, a power input unit, a main loop unit, a bus sampling unit, an LDO circuit unit, a communication control unit and a program programming unit, as shown in fig. 1.
The power input unit is used for providing a single-phase commercial power interface for the controller, and comprises a safety circuit and a single-phase three-wire input circuit, and the power input unit is connected with the main loop unit.
The main loop unit comprises a power-on buffer circuit, an EMC circuit, a rectifying circuit and a smoothing circuit and is used for carrying out buffer processing, EMC processing, arrangement processing and smoothing processing on an input power supply. The power-on buffer circuit comprises a current-limiting resistor and a relay connected in parallel with the current-limiting resistor, and the relay is connected with the microcontroller digital operation unit. The bus sampling unit is used for collecting bus voltage processed by the smoothing circuit of the controller in the current state, the bus voltage is sent to the micro-controller digital operation unit after voltage division and filtering through the divider resistor, and when the micro-controller digital operation unit detects that the bus voltage reaches a threshold value for more than three seconds, a relay of the power-on buffer circuit is closed to short-circuit the current-limiting resistor.
The LDO circuit unit carries out two-stage voltage reduction on the bus voltage after the flat wave processing to obtain a 15V power signal and a 3.3V power signal, and provides a non-isolated weak current power signal for the controller, the 3.3V power signal is used for supplying power for the microcontroller digital operation unit, the communication control unit and the program programming unit, the 15V power signal is used for supplying power for the current sampling unit and the inversion unit, and the bus supplies power for the motor through the inversion unit.
The communication control unit is used for the instruction interaction of the user upper computer and the microcontroller digital operation unit, and the user can send an instruction to the microcontroller digital operation unit through the user upper computer, so that the microcontroller digital operation unit controls the starting, stopping and running modes of the washing machine motor. The operation mode comprises a washing mode and a dehydration mode, and the upper computer of the user can also display the operation state of the washing machine.
The inversion unit generates a high-frequency modulation carrier signal according to a driving signal of the digital operation unit of the microcontroller to drive the motor to work. The inversion unit comprises an intelligent power module IPM and a back-mounted radiator, the intelligent power module IPM is fixed on the radiator and is welded on the PCB together, the intelligent power module IPM is fixed on the radiator to form an assembly, and then the assembly is welded on the PCB, so that the stress of each pin of the intelligent power module IPM can be reduced, and the reliability of a product is improved.
The program programming unit is used for instruction interaction between a manufacturer upper computer and the microcontroller digital operation unit, for example, the manufacturer conducts program debugging and program injection on the washing machine through the manufacturer upper computer.
The current sampling unit comprises an anti-distortion processing circuit, the current sampling unit collects three-phase lower bridge arm current signals of the inversion unit, the current signals are subjected to anti-distortion processing through the anti-distortion processing circuit and then sent to the micro-controller digital operation unit, and the micro-controller digital operation unit forms high-frequency carrier PWM signals for auxiliary driving of the inversion unit.
The microcontroller digital operation unit is provided with an MCU, can store a speed estimation program and a weight estimation program, can estimate the running speed of the motor and the weight of clothes according to the current signal fed back by the current sampling unit, and estimates the weight of the clothes so as to provide a recommended washing scheme for a user.
As shown in FIG. 2, the anti-distortion processing circuit comprises an input interface unit U9-1, a non-inverting input unit U9-2, an operational amplifier main unit U9-3, an operational amplifier feedback unit U9-4, an output signal processing unit U9-5 and an output interface unit U9-6 Iout; the non-inverting input unit is connected between the inverting unit and a non-inverting input end of the operational amplifier main unit U9-3, the operational amplifier feedback unit U9-4 is connected between an inverting input end of the operational amplifier main unit U9-3 and an output end of the operational amplifier main unit U9-3, and the output signal processing unit U9-5 is connected between an output end of the operational amplifier main unit U9-3 and the microcontroller digital operation unit.
Specifically, the input interface unit U9-1 includes a sampling current input interface Iin and a control signal interface mUc, the sampling current input interface is connected to the inverter unit, and the control signal interface is connected to the microcontroller digital arithmetic unit.
The in-phase terminal input unit U9-2 comprises a resistor R1, a resistor R2 and a resistor R3 which are sequentially connected in series, a sampling current input interface is connected with the resistor R1, a common point of the sampling current input interface and the resistor R1 is grounded through a capacitor C1, and the capacitor C1 is used for filtering high-frequency carrier frequency signals. The resistor R3 is connected with an electronic switch K1 in parallel, the common point of the resistor R1 and the resistor R2 is connected with the non-inverting input end of the operational amplifier main body unit U9-3, and the non-inverting input unit U9-2 is powered by a 1.65V pull-up bias power supply.
The operational amplifier feedback unit U9-4 comprises a capacitor C2, a resistor R5 and a resistor R6 which are connected in series, the resistor R6 is connected with an electronic switch K2 in parallel, one end of the capacitor C2 is connected to a common point of the resistor R5 and an inverting input end of the operational amplifier feedback unit U9-4, the capacitor C2 is used for eliminating high-frequency self-excitation and expanding the bandwidth of a system, the other end of the capacitor C2 is connected to a common point of the resistor R6 and an output end of the operational amplifier main unit U9-3, the inverting input end of the operational amplifier main unit U9-3 is grounded through R4, and the electronic switch K1 and the electronic switch K2 are connected with the microcontroller digital operation unit in common. The electronic switches K1 and K2 are linked electronic switches and are controlled by the microcontroller digital arithmetic unit to be turned on or off simultaneously.
The output signal processing unit U9-5 comprises a resistor R7 and a grounded capacitor C3, the capacitor C3 is an output filter capacitor, one end of the resistor R7 is connected with the output end of the operational amplifier main body unit U9-3, the other end of the resistor R7 is grounded through the capacitor C3 and connected with an output interface unit U9-6Iin, and the connection output interface unit U9-6Iin is connected with the microcontroller digital operation unit.
The positive side power pin of the operational amplifier main unit U9-3 is connected to a 3.3V power supply, and the negative side power pin of the operational amplifier main unit U9-3 is grounded.
The resistors R1-R6 can adopt plug-in resistors and chip resistors, and can also be resistors with different resistance values to be properly connected in series, connected in parallel or connected in series and parallel in a split and combination mode.
The resistances R1-R6 are governed by the following relationship: r1= R4, R3= R6= (k-1) × R2= (k-1) × R5, wherein k has a value of 1.5 to 7. In the washing mode, the microcontroller digital arithmetic unit controls the electronic switches K1 and K2 to keep an open state, the resistor R3 and the resistor 6 participate in current amplification calculation, and the current amplification coefficient is determined by K R5/R4, wherein K is 1.5-7. In the dehydration mode, the microcontroller digital operation unit controls the electronic switches K1 and K2 to keep a closed state, the resistor R3 and the resistor R6 are short-circuited by the electronic switches K1 and K2 and do not participate in current amplification calculation, and the current amplification coefficient is determined by K R5/R4, wherein K is 1.
U, V, W, three-phase three-resistance lower bridge arms respectively correspond to an anti-distortion processing circuit, the three-phase anti-distortion processing circuits share a control signal interface mUc, the input interface units are three-phase independent, the output interface units Iout are three-phase independent, and the three-phase independent ADC sampling fractures are respectively sent to a microcontroller digital operation unit. The anti-distortion processing circuits of the three-phase current sampling units are the same in processing type and processing mechanism, and the circuit structures are mutually independent.
The current sampling signal of the dewatering mode is about 5-7 times of that of the washing mode, if the same proportional amplification factor is adopted, the current signals of the washing mode and the dewatering mode are very easy to be positioned at two ends of the same amplification interval, so that the current signal in a certain state is very easy to enter a nonlinear interval to generate a distortion phenomenon, and particularly the current signal of the washing mode is relatively weak and is more easy to be interfered in the transmission process, so that the control performance of the control system of the whole washing machine is reduced. And carrying out differentiation processing on the current signals of the washing mode and the dehydration mode, and adjusting and controlling U, V, W amplification factors of three-phase current sampling according to the working state of the washing machine. Particularly, in a washing mode, the current sampling signal is weak, and a high current amplification coefficient is adopted, so that the anti-interference capability is improved; in the dehydration mode, the current sampling signal is stronger, and the collected signal is prevented from topping distortion by adopting a lower current amplification coefficient.
Claims (10)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011285280.7A CN112311294B (en) | 2020-11-17 | 2020-11-17 | A permanent magnet synchronous motor controller for washing machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011285280.7A CN112311294B (en) | 2020-11-17 | 2020-11-17 | A permanent magnet synchronous motor controller for washing machine |
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| CN112311294A true CN112311294A (en) | 2021-02-02 |
| CN112311294B CN112311294B (en) | 2025-05-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114584010A (en) * | 2022-03-07 | 2022-06-03 | 珠海格力电器股份有限公司 | Permanent magnet synchronous motor driving circuit, method, electronic device, and medium |
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| CN213426045U (en) * | 2020-11-17 | 2021-06-11 | 卧龙电气驱动集团股份有限公司 | Permanent magnet synchronous motor controller for washing machine |
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2020
- 2020-11-17 CN CN202011285280.7A patent/CN112311294B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH10132861A (en) * | 1996-10-30 | 1998-05-22 | Yaskawa Electric Corp | Current detector of ac servo driver |
| JP2003188724A (en) * | 2001-12-14 | 2003-07-04 | Sankyo Seiki Mfg Co Ltd | Method for converting analog signal to digital signal and signal detector |
| US20070284248A1 (en) * | 2006-05-26 | 2007-12-13 | Denso Corporation | Gas concentration measuring apparatus designed to enhance measurement accuracy in desired range |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114584010A (en) * | 2022-03-07 | 2022-06-03 | 珠海格力电器股份有限公司 | Permanent magnet synchronous motor driving circuit, method, electronic device, and medium |
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| CN112311294B (en) | 2025-05-13 |
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