WO2021043240A1 - Procédé de mesure de courant de phase de moteur faisant appel à la régulation de la mli et climatiseur - Google Patents

Procédé de mesure de courant de phase de moteur faisant appel à la régulation de la mli et climatiseur Download PDF

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Publication number
WO2021043240A1
WO2021043240A1 PCT/CN2020/113397 CN2020113397W WO2021043240A1 WO 2021043240 A1 WO2021043240 A1 WO 2021043240A1 CN 2020113397 W CN2020113397 W CN 2020113397W WO 2021043240 A1 WO2021043240 A1 WO 2021043240A1
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WO
WIPO (PCT)
Prior art keywords
motor
current
phase
carrier frequency
bus
Prior art date
Application number
PCT/CN2020/113397
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English (en)
Chinese (zh)
Inventor
冯正阳
邵海柱
耿焱
时斌
丛安平
张波
Original Assignee
青岛海尔空调电子有限公司
海尔智家股份有限公司
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Application filed by 青岛海尔空调电子有限公司, 海尔智家股份有限公司 filed Critical 青岛海尔空调电子有限公司
Publication of WO2021043240A1 publication Critical patent/WO2021043240A1/fr

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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
    • H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
    • H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
    • H02P1/42—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual single-phase induction motor
    • 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
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
    • 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
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
    • H02P27/085—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency

Definitions

  • the invention relates to the technical field of current detection, in particular to a method for detecting phase current of a motor based on PWM control and an air conditioner.
  • the art needs a new method for detecting the phase current of the motor based on PWM control and an air conditioner to solve the above-mentioned problems.
  • the present invention provides a phase current detection method of a motor based on PWM control.
  • Current detection methods include:
  • the phase current detection method further includes:
  • the step of "reducing the PWM carrier frequency of the motor” specifically includes:
  • the PWM carrier frequency of the motor is reduced, so that the effective current signal of the DC bus can be continuously detected.
  • the step of "reducing the PWM carrier frequency of the motor” specifically includes:
  • the PWM carrier frequency of the motor is reduced to at least half of the reference frequency.
  • the motor startup process includes a positioning phase, a forced start phase, and a closed-loop control phase.
  • the step of "reducing the PWM carrier frequency of the motor” specifically includes :
  • the motor is a motor of an air conditioner compressor.
  • the application also provides an air conditioner, including a compressor and a controller.
  • the compressor includes a motor based on PWM control.
  • a sampling resistor is provided on the DC bus of the motor, and the sampling resistor is used to detect the direct current. Bus current signal,
  • the controller is configured to calculate the phase current of the motor according to the current signal of the DC bus detected by the sampling resistor during the motor starting process,
  • the controller is further configured to reduce the PWM carrier frequency of the motor while detecting the current signal of the DC bus through the sampling resistor.
  • the controller reduces the PWM carrier frequency of the motor so that the effective current signal of the DC bus can be continuously detected.
  • the controller reduces the PWM carrier frequency of the motor to at least half of the reference frequency.
  • the motor starting process includes a positioning phase, a forced starting phase, and a closed-loop control phase, and the controller reduces the PWM carrier frequency of the motor during the forced starting phase.
  • the phase current detection method of the motor based on PWM control includes: detecting the current signal of the DC bus of the motor during the motor starting process; Calculate the phase current of the motor according to the current signal of the DC bus; while detecting the current signal of the DC bus, reduce the PWM carrier frequency of the motor.
  • the duration of the current waveform is increased, the current is easier to collect, and the collected current is more accurate.
  • this method does not require other hardware changes, it is simple and reliable to implement.
  • the duration of the current waveform is extended by at least 2 times, there is sufficient sampling time when collecting the current, and the sampling result is more accurate.
  • the method not only can effectively collect current, but also because the carrier frequency is modified only in the forced start phase, the operating performance of the system will not be affected.
  • Fig. 1 is a flowchart of a method for detecting phase current of a motor based on PWM control of the present invention
  • Fig. 2 is a schematic diagram of sampling of the DC bus current of the present invention.
  • FIG. 1 is a flowchart of the method for detecting phase current of a motor based on PWM control of the present invention.
  • the detection method of the present invention mainly includes the following steps:
  • FIG. 2 is a schematic diagram of sampling of the DC bus current of the present invention.
  • the step of "reducing the PWM carrier frequency of the motor” is further as follows: reducing the PWM carrier frequency of the motor to a level that enables continuous detection of the DC bus
  • the effective current signal preferably, reduces the PWM carrier frequency of the motor to half of the reference frequency.
  • the current waveform duration is prolonged by 2 times, there is sufficient sampling time when collecting current, and the sampling result is more accurate.
  • the detected effective current is very small, and the system cannot accurately collect the current; when the PWM carrier frequency is reduced to half of the reference frequency, The effective current can be collected in most cases when the motor is started, and the collected effective current has high accuracy.
  • the motor starting process includes a positioning phase, a forced start phase, and a closed-loop control phase, and the step of reducing the PWM carrier frequency of the motor is performed in the forced start phase.
  • the reference frequency of the motor is 6kHz.
  • the motor starts it starts and locates at the reference frequency of 6kHz; when it starts to the forced start phase, reduce the PWM carrier frequency to 3kHz and perform current sampling; when the motor continues to run to In the closed-loop control phase, the PWM carrier frequency is increased to the reference frequency of 6kHz to ensure the normal operation of the motor.
  • the method By reducing the PWM carrier frequency of the motor in the forced start phase, the method not only can effectively collect the current, but also because the carrier frequency is modified only in the forced start phase, the operating performance of the system will not be affected.
  • phase current detection method of the present application will be introduced below with reference to FIG. 2 in conjunction with the motor of the air-conditioning compressor.
  • the actual sampling time a and b are relatively long, so there is no problem with sampling.
  • the difference in duration between U out , V out and W out is generally not too large.
  • the waveform duration of W out is 200 us, V out is 300 us, and U out is 400us, at this time, because the time difference between the two phases is too small, the actual output current waveform duration is too short, and it is impossible to sample the current with such a small duration.
  • the DC bus current sampling can be performed either at the front end of the PWM carrier or at the back end of the PWM carrier.
  • the sampling of the DC bus current is performed at the front time of the PWM carrier, while the sampling of the DC bus current is performed at the rear time of the PWM carrier.
  • the principle is the same as that performed at the front time of the PWM carrier. This is no longer exhausted.
  • the application also provides an air conditioner, including a compressor and a controller.
  • the compressor includes a motor based on PWM control.
  • the DC bus of the motor is provided with a sampling resistor, and the sampling resistor is used to detect the current signal of the DC bus.
  • the controller is configured to reduce the PWM carrier frequency of the motor while detecting the current signal of the DC bus through the sampling resistor, and calculate the phase current of the motor based on the current signal of the DC bus detected through the sampling resistor during the motor starting process.
  • the controller reduces the PWM carrier frequency of the motor so that the effective current signal of the DC bus can be continuously detected. More preferably, the controller reduces the PWM carrier frequency of the motor to at least half of the reference frequency.
  • the motor startup process includes a positioning phase, a forced startup phase, and a closed-loop control phase, and the controller reduces the PWM carrier frequency of the motor during the forced startup phase.
  • the above-mentioned controller may be the controller of the air conditioner itself, may be a controller specifically used to execute the method of the present invention, or may be a function of a general-purpose controller.
  • the module or functional unit may also be a micro-control unit (MCU) configured by the motor itself, and this change does not constitute any limitation to the protection scope of the present invention.
  • MCU micro-control unit

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)
  • Motor And Converter Starters (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

L'invention concerne un procédé de mesure de courant de phase de moteur faisant appel à la régulation de la modulation de largeur d'impulsions (MLI) et un climatiseur ; ledit procédé de mesure de courant de phase consiste à : mesurer, pendant le processus de démarrage d'un moteur, un signal de courant d'un bus c.c. du moteur (S100) ; réduire, tout en mesurant le signal de courant du bus c.c., la fréquence porteuse de MLI du moteur (S200) ; calculer le courant de phase du moteur en fonction du signal de courant du bus c.c. (S300). Au moyen de la mesure du signal de courant du bus c.c. du moteur, la fréquence porteuse de MLI du moteur est réduite, augmentant la durée de la forme d'onde du courant, de sorte qu'il est plus facile de collecter le courant et que le courant collecté est plus précis.
PCT/CN2020/113397 2019-09-04 2020-09-04 Procédé de mesure de courant de phase de moteur faisant appel à la régulation de la mli et climatiseur WO2021043240A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201910833866.3 2019-09-04
CN201910833866.3A CN112448619A (zh) 2019-09-04 2019-09-04 基于pwm控制的电机的相电流检测方法及空调器

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Publication Number Publication Date
WO2021043240A1 true WO2021043240A1 (fr) 2021-03-11

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CN (1) CN112448619A (fr)
WO (1) WO2021043240A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1756070A (zh) * 2004-09-29 2006-04-05 丰田自动车株式会社 电动机系统的控制装置和控制方法
CN101378235A (zh) * 2007-08-27 2009-03-04 日立汽车技术有限公司 电力转换装置
CN101769953A (zh) * 2010-01-14 2010-07-07 东元总合科技（杭州）有限公司 基于直流母线电流的电动机相电流检测方法
US20160094177A1 (en) * 2013-04-12 2016-03-31 Mitsubishi Electric Corporation Power conversion device and motor drive device including power conversion device

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003348875A (ja) * 2002-05-27 2003-12-05 Matsushita Electric Ind Co Ltd 電動機駆動装置
JP3972124B2 (ja) * 2002-07-10 2007-09-05 株式会社日立製作所 同期電動機の速度制御装置
JP4847060B2 (ja) * 2005-07-15 2011-12-28 日立オートモティブシステムズ株式会社 交流モータ駆動装置及びその制御方法
CN103326629B (zh) * 2013-07-10 2015-08-12 江苏浩峰汽车附件有限公司 一种无刷直流电机的开环启动方法及系统
CN103701374B (zh) * 2013-12-17 2016-04-06 上海发电设备成套设计研究院 一种高压变频调速装置的软启动方法
KR101709475B1 (ko) * 2015-02-02 2017-03-08 엘지전자 주식회사 모터구동장치, 및 이를 구비하는 세탁물 처리기기
DE112015006879T5 (de) * 2015-09-04 2018-05-09 Mitsubishi Electric Corporation Leistungsumwandlungsvorrichtung und Wärmepumpenvorrichtung
JP6718356B2 (ja) * 2016-10-17 2020-07-08 東芝キヤリア株式会社 モータ制御装置及びヒートポンプ式冷凍サイクル装置
JP2018153027A (ja) * 2017-03-14 2018-09-27 株式会社東芝 同期電動機の回転位置推定装置，空調機及び洗濯機
JP6316481B1 (ja) * 2017-04-21 2018-04-25 三菱電機株式会社 電動機の制御装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1756070A (zh) * 2004-09-29 2006-04-05 丰田自动车株式会社 电动机系统的控制装置和控制方法
CN101378235A (zh) * 2007-08-27 2009-03-04 日立汽车技术有限公司 电力转换装置
CN101769953A (zh) * 2010-01-14 2010-07-07 东元总合科技（杭州）有限公司 基于直流母线电流的电动机相电流检测方法
US20160094177A1 (en) * 2013-04-12 2016-03-31 Mitsubishi Electric Corporation Power conversion device and motor drive device including power conversion device

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