CN110994557A - Phase loss detection method and protection mechanism for PMSM motor - Google Patents

Phase loss detection method and protection mechanism for PMSM motor Download PDF

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Publication number
CN110994557A
CN110994557A CN201911081840.4A CN201911081840A CN110994557A CN 110994557 A CN110994557 A CN 110994557A CN 201911081840 A CN201911081840 A CN 201911081840A CN 110994557 A CN110994557 A CN 110994557A
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phase
pmsm
motor
current
value
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杨土权
郑魏
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Guangdong Song Research Electronic Technology Co ltd
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Guangdong Song Research Electronic Technology Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines
    • G01R31/343—Testing dynamo-electric machines in operation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means

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  • General Physics & Mathematics (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

The invention relates to a phase-loss detection method and a protection mechanism for a PMSM (permanent magnet synchronous motor), which are characterized in that: presetting a current threshold value for phase-loss comparison of a PMSM motor, and preparing a detection device with a processor chip MCU and a current sensor; starting a PMSM (permanent magnet synchronous motor) and enabling the PMSM to be in normal operation or low-speed operation, and sampling three-phase alternating current of the PMSM in real time; converting the negative value of the lower half part of the three-phase alternating current of the PMSM motor sampled in real time into a positive value, namely taking the absolute value of the three-phase alternating current, and then performing low-pass filtering processing in real time to convert the three-phase alternating current signal into a direct current signal; comparing the three-phase direct current signal obtained by conversion with the current threshold value, when the three-phase direct current value is larger than the current threshold value, determining that the phase is in a phase-lacking state, and otherwise, determining that the phase is in a normal state; and when the phase-lack state of the PMSM motor is detected and confirmed, setting a phase-lack flag bit and triggering a phase-lack timer to time the phase-lack state. The method has the characteristic of short response time of open-phase protection.

Description

Phase loss detection method and protection mechanism for PMSM motor
Technical Field
The invention relates to a phase-loss detection method and a protection mechanism for a PMSM (permanent magnet synchronous motor), which are suitable for detecting and controlling the PMSM. Belongs to the technical field of motor detection and control.
Background
Due to the inherent characteristics of high efficiency, silence, energy conservation and the like of the PMSM, the PMSM is widely applied to industries such as industry, automobiles, household appliances and the like, and higher requirements are put forward on the driving and safety of the PMSM. Various protection mechanisms are required to respond in real time and operate reliably. Judging whether the PMSM motor is in a phase failure is an important index of one protection mechanism.
In the prior art, phase loss detection of a PMSM motor is mostly detected in the motor running process, and in the method 1, current of one phase is sampled for integration in a period of time, and whether the phase loss exists is determined by judging whether an integrated value is 0 or not. The method 2 is that the maximum current value in a period of time is respectively calculated by respectively sampling the values of three-phase current, then the maximum current values are compared, and the phase failure is judged as long as the difference value exceeds a set threshold value. The two open-phase detection methods of the method 1 and the method 2 need to be processed after sampling for a certain time, the time is related to the rotating speed of the motor and is difficult to accurately grasp, and the sampling time period is easy to be shortened or enlarged. The method 1 is a single-phase current integration method, the sampling time period is required to be just equal to the running period of the motor at the time, the sampling time period has strict requirements, and the problems that the integral value cannot meet the detection and judgment requirements easily, the detection and judgment accuracy is low, the effect is poor and the like exist. The method 2 is a three-phase current comparison method, and because the period when the minimum running speed of the motor needs to be obtained is a sampling time period, the whole running period of the motor needs to be covered; the sampling time is long, the response time of open-phase protection is influenced, the open-phase protection is easy to lose effectiveness, and the safety coefficient is low.
Disclosure of Invention
One of the purposes of the invention is to solve the problems of low detection and judgment accuracy and poor effect of a single-phase current integration method and long sampling time, easy phase loss protection failure and low safety coefficient of a three-phase current comparison method in the prior art, and the invention provides a PMSM motor phase loss detection method which has the outstanding substantive characteristics and remarkable progress of short phase loss protection response time, high detection and judgment accuracy, high safety coefficient and the like.
The second objective of the present invention is to provide a phase-loss protection mechanism for PMSM motor to enhance the reliability of the protection mechanism.
One of the purposes of the invention can be achieved by adopting the following technical scheme:
a PMSM motor phase loss detection method is characterized in that:
1) presetting a current threshold value for phase-loss comparison of a PMSM motor, and preparing a detection device with a processor chip MCU and a current sensor; starting a PMSM (permanent magnet synchronous motor) and enabling the PMSM to be in normal operation or low-speed operation, and sampling three-phase alternating current of the PMSM in real time;
2) converting the negative value of the lower half part of the three-phase alternating current of the PMSM motor sampled in real time into a positive value, namely taking the absolute value of the three-phase alternating current, and then performing low-pass filtering processing in real time to convert the three-phase alternating current signal into a direct current signal;
3) and comparing the three-phase direct current signal obtained by conversion with the current threshold value, determining that the phase is in a phase-lacking state when the three-phase direct current value is greater than the current threshold value, and otherwise determining that the phase is in a normal state when the three-phase direct current value is smaller than the current threshold value.
One of the purposes of the invention can be achieved by adopting the following technical scheme:
further, in the point 1), during the whole running process of the motor, the three-phase current I of the PMSM motor is sampled in real time by using the MCU of the processor chipu、Iv、IwThe AD sampling module connected to the MCU signal input end of the processor chip samples the real-time current output by the current sensor to obtain a three-phase alternating current Iu、Iv、IwConverting the signal into a direct current signal and inputting the direct current signal into a processor chip MCU; the three-phase currents differ in phase by 120 electrical degrees, i.e.
Iu＝I*sin(θ)
Iv＝I*sin(θ-120)
Iw＝I*sin(θ-240)；
In the formula, I is a three-phase current rated value of the PMSM motor.
Further, in the point 2), after the negative value of the lower half part of the three-phase alternating current of the PMSM motor is converted into a positive value, the absolute value of the three-phase current value is taken, the negative value of the lower half part is converted into a positive value, and the positive value is stored in the Iu_abs,Iv_abs,Iw_absAmong the three variables; then to Iu_abs,Iv_abs,Iw_absLow-pass filtering to convert the signal into DC signal and storing it in Iu_flt,Iv_flt,Iw_fltOf the three variables.
Further, when a current threshold value for phase loss comparison of the PMSM motor is set, the average value of three-phase current values after low-pass filtering is calculated and stored in IavgIn (I)avgIs expressed as Iavg＝(Iu_flt+Iv_flt+Iw_flt) A/3; setting the current threshold value of phase-loss comparison of the PMSM motor as Iavg/2 preservation to IthIn (1).
Further, the current threshold value for the phase loss comparison of the PMSM motor can be set according to the load of the motor.
The second purpose of the invention can be achieved by adopting the following technical scheme:
a PMSM motor open-phase protection mechanism which is characterized in that: judging whether the motor is in a default phase state or not by adopting a PMSM motor default phase detection method, setting a default phase flag bit and triggering a default phase timer when the PMSM motor is detected and determined to be in the default phase state, timing the default phase state, and triggering to protect the action of the PMSM motor and turning off the motor to run when the timing time reaches a preset time; if the phase-lack state of the PMSM motor is recovered within the timing time, the phase-lack timer needs to be reset; to start the next phase loss detection.
The second purpose of the invention can be achieved by adopting the following technical scheme:
further, the PMSM motor phase loss detection method includes:
1) presetting a current threshold value for phase-loss comparison of a PMSM motor, and preparing a detection device with a processor chip MCU and a current sensor; starting a PMSM (permanent magnet synchronous motor) and enabling the PMSM to be in normal operation or low-speed operation, and sampling three-phase alternating current of the PMSM in real time;
2) converting the negative value of the lower half part of the three-phase alternating current of the PMSM motor sampled in real time into a positive value, namely taking the absolute value of the three-phase alternating current, and then performing low-pass filtering processing in real time to convert the three-phase alternating current signal into a direct current signal;
3) comparing the three-phase direct current signal obtained by conversion with the current threshold value, determining that the phase is in a phase-lacking state when the three-phase direct current value is larger than the current threshold value, and otherwise determining that the phase is in a normal state when the three-phase direct current value is smaller than the current threshold value;
4) the filtered three-phase current value Iu_flt、Iv_flt、Iw_fltAnd a threshold value IthComparing, and explaining a protection mechanism of the phase-lack detection by taking a U phase as an example; if Iu_flt<IthSetting a phase-lack flag and timing, if the timing time exceeds 50ms, triggering phase-lack protection, turning off the motor, and resetting the phase-lack flag and the phase-lack timer. If within 50ms, Iu_flt>＝IthIf the phase-lack fault does not exist, resetting the phase-lack mark and the phase-lack timer; the other two phases operate on the same principle as the U phase.
The invention has the following prominent substantive characteristics and remarkable technical progress:
1. the invention relates to a phase-loss detection method of a PMSM (permanent magnet synchronous motor), which is characterized in that three-phase alternating current of the PMSM is sampled in real time by presetting a current threshold value for phase-loss comparison of the PMSM; converting the negative value of the lower half part of the three-phase alternating current of the PMSM motor sampled in real time into a positive value, namely taking the absolute value of the three-phase alternating current, and then performing low-pass filtering processing in real time to convert the three-phase alternating current signal into a direct current signal; comparing the three-phase direct current signal obtained by conversion with the current threshold value, determining that the phase is in a phase-lacking state when the three-phase direct current value is larger than the current threshold value, and otherwise determining that the phase is in a normal state when the three-phase direct current value is smaller than the current threshold value; therefore, the method can solve the problems of low detection and judgment accuracy and poor effect of a single-phase current integration method and long sampling time, easy phase-loss protection failure, low safety coefficient and the like of a three-phase current comparison method in the prior art, and has the outstanding substantial characteristics of short phase-loss protection response time, high detection and judgment accuracy, high safety coefficient and the like and remarkable progress
2. The invention relates to a phase-lack protection mechanism of a PMSM (permanent magnet synchronous motor), which judges whether a motor is in phase-lack state or not by adopting a PMSM phase-lack detection method, sets a phase-lack flag bit and triggers a phase-lack timer after the phase-lack state of the PMSM is detected and confirmed, times the phase-lack state, and triggers the action of protecting the PMSM motor and turns off the motor to run when the timed time reaches the preset time; if the phase-lack state of the PMSM motor is recovered within the timing time, the phase-lack timer needs to be reset; starting the next phase loss detection; therefore, the real-time performance and the accuracy of open-phase protection can be obviously improved, the running reliability of the PMSM motor is improved, and potential safety hazards caused by failure of open-phase detection are reduced.
3. The invention has the prominent substantive characteristics and remarkable progress of low cost, high reliability and the like.
Drawings
FIG. 1 is a functional block diagram of the phase loss detection method of the present invention.
Fig. 2 is a functional block diagram of the open-phase protection mechanism of the present invention.
Fig. 3 is a flow chart of a method for implementing an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
Detailed description of the preferred embodiment 1
Referring to fig. 1 and 3, the method for detecting a phase loss of a PMSM motor according to the present embodiment is characterized in that:
1) presetting a current threshold value for phase-loss comparison of a PMSM motor, and preparing a detection device with a processor chip MCU and a current sensor; starting a PMSM (permanent magnet synchronous motor) and enabling the PMSM to be in normal operation or low-speed operation, and sampling three-phase alternating current of the PMSM in real time;
2) converting the negative value of the lower half part of the three-phase alternating current of the PMSM motor sampled in real time into a positive value, namely taking the absolute value of the three-phase alternating current, and then performing low-pass filtering processing in real time to convert the three-phase alternating current signal into a direct current signal;
3) and comparing the three-phase direct current signal obtained by conversion with the current threshold value, determining that the phase is in a phase-lacking state when the three-phase direct current value is greater than the current threshold value, and otherwise determining that the phase is in a normal state when the three-phase direct current value is smaller than the current threshold value.
In this embodiment:
in the whole process of motor operation, a processor chip MCU is utilized to sample the three-phase current I of the PMSM motor in real timeu、Iv、IwThe AD sampling module connected to the MCU signal input end of the processor chip samples the real-time current output by the current sensor to obtain a three-phase alternating current Iu、Iv、IwConverting the signal into a direct current signal and inputting the direct current signal into a processor chip MCU; the three-phase currents differ in phase by 120 electrical degrees, i.e.
Iu＝I*sin(θ)
Iv＝I*sin(θ-120)
Iw＝I*sin(θ-240)；
In the formula, I is a three-phase current rated value of the PMSM motor.
After the negative value of the lower half part of the three-phase alternating current of the PMSM motor is converted into a positive value, the absolute value of the three-phase current value is taken, the negative value of the lower half part is converted into a positive value, and the positive value is stored in Iu_abs,Iv_abs,Iw_absAmong the three variables; then to Iu_abs,Iv_abs,Iw_absLow-pass filtering to convert the signal into DC signal and storing it in Iu_flt,Iv_flt,Iw_fltOf the three variables.
Referring to fig. 2-3, the phase-loss protection mechanism of the PMSM motor according to the present invention determines whether the motor is phase-loss by using a PMSM motor phase-loss detection method, sets a phase-loss flag bit and triggers a phase-loss timer when the PMSM motor is detected to be in a phase-loss state, times the phase-loss state, and triggers a PMSM motor protection action to stop the motor from running when the timed time reaches a preset time; if the phase-lack state of the PMSM motor is recovered within the timing time, the phase-lack timer needs to be reset; to start the next phase loss detection.
The PMSM motor phase loss detection method comprises the following steps:
1) presetting a current threshold value for phase-loss comparison of a PMSM motor, and preparing a detection device with a processor chip MCU and a current sensor; starting a PMSM (permanent magnet synchronous motor) and enabling the PMSM to be in normal operation or low-speed operation, and sampling three-phase alternating current of the PMSM in real time;
2) converting the negative value of the lower half part of the three-phase alternating current of the PMSM motor sampled in real time into a positive value, namely taking the absolute value of the three-phase alternating current, and then performing low-pass filtering processing in real time to convert the three-phase alternating current signal into a direct current signal;
3) comparing the three-phase direct current signal obtained by conversion with the current threshold value, determining that the phase is in a phase-lacking state when the three-phase direct current value is larger than the current threshold value, and otherwise determining that the phase is in a normal state when the three-phase direct current value is smaller than the current threshold value;
4) the filtered three-phase current value Iu_flt、Iv_flt、Iw_fltAnd a threshold value IthComparing, and explaining a protection mechanism of the phase-lack detection by taking a U phase as an example; if Iu_flt<IthSetting a phase-lack flag and timing, if the timing time exceeds 50ms, triggering phase-lack protection, turning off the motor, and resetting the phase-lack flag and the phase-lack timer. If within 50ms, Iu_flt>＝IthIf the phase-lack fault does not exist, resetting the phase-lack mark and the phase-lack timer; the other two phases operate on the same principle as the U phase.
In this embodiment:
the current threshold can be set to 10ma and stored in IthIn the middle, the three-phase current rated value I of the PMSM motor is 10ma whenThree-phase current I of PMSM motor is sampled in real timeu、Iv、IwWhen the current values are 8ma respectively, the absolute values of the three-phase current values are 16ma respectively and are stored in Iu_abs,Iv_abs,Iw_absAmong the three variables; then to Iu_abs,Iv_abs,Iw_absLow-pass filtering to convert the signal into DC signal (i.e. DC 16ma current signal), and storing in Iu_flt,Iv_flt,Iw_fltThe average value of the three-phase current values after low-pass filtering is calculated to be direct current 16ma in the three variables and is stored in IavgIn (1). Three-phase direct current signal I obtained by conversionu_flt,Iv_flt,Iw_fltAnd the current threshold value IthBy comparison, it is apparent that three-phase DC signal Iu_flt,Iv_flt,Iw_fltGreater than current threshold IthTherefore, the PMSM motor does not lack a phase. And when the three-phase current I of the PMSM motor is sampled in real timeu、Iv、IwWhen the current of any phase is less than 5ma, the average value of the current values of the phase current after low-pass filtering is that the direct current is less than 10ma, namely less than the current threshold value IthWhen the phase is in a default phase state, the phase is explained, namely, the phase is set, a phase-missing flag bit is set, a phase-missing timer is triggered, the phase-missing state is timed, and when the timed time reaches the preset time, the action of protecting the PMSM motor is triggered, and the motor is turned off; if the phase-lack state of the PMSM motor is recovered within the timing time, the phase-lack timer needs to be reset; to start the next phase loss detection.
Specific example 2:
the specific embodiment 2 of the present invention is characterized in that: when a current threshold value for phase loss comparison of the PMSM motor is set, the average value of three-phase current values after low-pass filtering is calculated and stored to IavgIn (I)avgIs expressed as Iavg＝(Iu_flt+Iv_flt+Iw_flt) A/3; setting the current threshold value of phase-loss comparison of the PMSM motor as Iavg/2 preservation to IthIn (1). Namely, the current threshold value of the phase-loss comparison of the PMSM motor is determined by the average value of three-phase current detected in real time after the three-phase current is converted into direct current through low-pass filtering,and then comparing the real-time detection current of each phase with the current threshold value, thereby detecting the phase loss and carrying out phase loss protection on the motor. The rest is the same as in embodiment 1.
Specific example 3:
the specific embodiment 3 of the present invention is characterized in that: the current threshold value for the phase-loss comparison of the PMSM motor can also be set according to the load of the motor. The rest is the same as in embodiment 1.
In addition, in other embodiments of the invention, when the phase loss detection of the motor is performed, the control chip MCU can sample the three-phase current I of the PMSM motor in real time in the whole process of the motor operationu，Iv，IwIs shown byu，Iv，IwThe three-phase current is subjected to direct current bias, the bias voltage is 1/2 (VCC/2) of the supply voltage of the MCU, and the three-phase current is different in phase by 120 electrical angles (VCC/2)
Iu＝VCC/2+I*sin(θ)
Iv＝VCC/2+I*sin(θ-120)
Iw＝VCC/2+I*sin(θ-240)；
In the formula, I is a three-phase current rated value of the PMSM motor.
The sampled current value Iu，Iv，IwReduction is carried out, namely three-phase current is reduced into original current signal value
Iu＝I*sin(θ)
Iv＝I*sin(θ-120)
Iw＝I*sin(θ-240)；
In the formula, I is a three-phase current rated value of the PMSM motor.
Taking the absolute value of the three-phase current value, converting the negative value of the lower half part into a positive value, and storing the positive value in Iu_abs,Iv_abs,Iw_absAmong the three variables; to Iu_abs,Iv_abs,Iw_absLow-pass filtering to convert the signal into DC signal and storing it in Iu_flt,Iv_flt,Iw_fltAmong the three variables;
calculating the average value of the filtered three-phase current values, storing the average value into Iavg,
Iavg＝(Iu_flt+Iv_flt+Iw_flt)/3
setting the phase failure threshold value according to the load of the motor and storing the threshold value to IthIn the implementation process of the invention, take Ith＝Iavg/2。

Claims (7)

1. A PMSM motor phase loss detection method is characterized in that:
1) presetting a current threshold value for phase-loss comparison of a PMSM motor, and preparing a detection device with a processor chip MCU and a current sensor; starting a PMSM (permanent magnet synchronous motor) and enabling the PMSM to be in normal operation or low-speed operation, and sampling three-phase alternating current of the PMSM in real time;
2) converting the negative value of the lower half part of the three-phase alternating current of the PMSM motor sampled in real time into a positive value, namely taking the absolute value of the three-phase alternating current, and then performing low-pass filtering processing in real time to convert the three-phase alternating current signal into a direct current signal;
3) and comparing the three-phase direct current signal obtained by conversion with the current threshold value, determining that the phase is in a phase-lacking state when the three-phase direct current value is greater than the current threshold value, and otherwise determining that the phase is in a normal state when the three-phase direct current value is smaller than the current threshold value.
2. The PMSM motor phase loss detection method of claim 1, characterized in that: in the 1) point, the three-phase current I of the PMSM motor is sampled in real time by using a processor chip MCU in the whole running process of the motoru、Iv、IwThe AD sampling module connected to the MCU signal input end of the processor chip samples the real-time current output by the current sensor to obtain a three-phase alternating current Iu、Iv、IwConverting the signal into a direct current signal and inputting the direct current signal into a processor chip MCU; the three-phase currents differ in phase by 120 electrical degrees, i.e.
Iu＝I*sin(θ)
Iv＝I*sin(θ-120)
Iw＝I*sin(θ-240)；
In the formula, I is a three-phase current rated value of the PMSM motor.
3. The PMSM motor phase loss detection method of claim 1, characterized in that: in the point 2), after the negative value of the lower half part of the three-phase alternating current of the PMSM motor is converted into a positive value, the absolute value of the three-phase current value is taken, the negative value of the lower half part is converted into the positive value, and the positive value is stored in the point Iu_abs,Iv_abs,Iw_absAmong the three variables; then to Iu_abs,Iv_abs,Iw_absLow-pass filtering to convert the signal into DC signal and storing it in Iu_flt,Iv_flt,Iw_fltOf the three variables.
4. The PMSM motor phase loss detection method of claim 1, characterized in that: when a current threshold value for phase loss comparison of the PMSM motor is set, the average value of three-phase current values after low-pass filtering is calculated and stored to IavgIn (I)avgIs expressed as Iavg＝(Iu_flt+Iv_flt+Iw_flt) A/3; setting the current threshold value of phase-loss comparison of the PMSM motor as Iavg/2 preservation to IthIn (1).
5. A PMSM motor phase loss detection method according to any of claims 1-4, characterised in that: the current threshold value for the phase-loss comparison of the PMSM motor can be set according to the load of the motor.
6. A PMSM motor open-phase protection mechanism which is characterized in that: judging whether the motor is in a default phase state or not by adopting a PMSM motor default phase detection method, setting a default phase flag bit and triggering a default phase timer when the PMSM motor is detected and determined to be in the default phase state, timing the default phase state, and triggering to protect the action of the PMSM motor and turning off the motor to run when the timing time reaches a preset time; if the phase-lack state of the PMSM motor is recovered within the timing time, the phase-lack timer needs to be reset; to start the next phase loss detection.
7. The lack-phase protection mechanism of PMSM motor according to claim 6, characterized in that: the PMSM motor phase loss detection method comprises the following steps:
1) presetting a current threshold value for phase-loss comparison of a PMSM motor, and preparing a detection device with a processor chip MCU and a current sensor; starting a PMSM (permanent magnet synchronous motor) and enabling the PMSM to be in normal operation or low-speed operation, and sampling three-phase alternating current of the PMSM in real time;
2) converting the negative value of the lower half part of the three-phase alternating current of the PMSM motor sampled in real time into a positive value, namely taking the absolute value of the three-phase alternating current, and then performing low-pass filtering processing in real time to convert the three-phase alternating current signal into a direct current signal;
3) comparing the three-phase direct current signal obtained by conversion with the current threshold value, determining that the phase is in a phase-lacking state when the three-phase direct current value is larger than the current threshold value, and otherwise determining that the phase is in a normal state when the three-phase direct current value is smaller than the current threshold value;
4) the filtered three-phase current value Iu_flt、Iv_flt、Iw_fltAnd a threshold value IthComparing, and explaining a protection mechanism of the phase-lack detection by taking a U phase as an example; if Iu_flt<IthSetting a phase-lack flag and timing, if the timing time exceeds 50ms, triggering phase-lack protection, turning off the motor, and resetting the phase-lack flag and the phase-lack timer. If within 50ms, Iu_flt>＝IthIf the phase-lack fault does not exist, resetting the phase-lack mark and the phase-lack timer; the other two phases operate on the same principle as the U phase.
CN201911081840.4A 2019-11-07 2019-11-07 Phase loss detection method and protection mechanism for PMSM motor Pending CN110994557A (en)

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Publication number Priority date Publication date Assignee Title
CN111404122A (en) * 2020-05-18 2020-07-10 哈尔滨科学技术职业学院 Output open-phase detection and protection method for three-phase inverter
CN113567768A (en) * 2021-09-09 2021-10-29 深圳市诺科科技有限公司 Phase-loss detection circuit and method for stepping motor
CN114200220A (en) * 2021-12-06 2022-03-18 广州天加环境控制设备有限公司 Permanent magnet synchronous motor phase loss detection method based on two-stage positioning
CN114720785A (en) * 2022-06-13 2022-07-08 中山大洋电机股份有限公司 Motor with three-phase power supply open-phase detection function and power supply open-phase detection method
WO2022193556A1 (en) * 2021-03-15 2022-09-22 广东拓斯达科技股份有限公司 Motor phase loss detection method and device, and storage medium

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106814262A (en) * 2017-01-04 2017-06-09 广东美的制冷设备有限公司 Three phase alternating current motor and its method for detecting open phase and device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106814262A (en) * 2017-01-04 2017-06-09 广东美的制冷设备有限公司 Three phase alternating current motor and its method for detecting open phase and device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111404122A (en) * 2020-05-18 2020-07-10 哈尔滨科学技术职业学院 Output open-phase detection and protection method for three-phase inverter
WO2022193556A1 (en) * 2021-03-15 2022-09-22 广东拓斯达科技股份有限公司 Motor phase loss detection method and device, and storage medium
CN113567768A (en) * 2021-09-09 2021-10-29 深圳市诺科科技有限公司 Phase-loss detection circuit and method for stepping motor
CN114200220A (en) * 2021-12-06 2022-03-18 广州天加环境控制设备有限公司 Permanent magnet synchronous motor phase loss detection method based on two-stage positioning
CN114200220B (en) * 2021-12-06 2023-09-08 广州天加环境控制设备有限公司 Permanent magnet synchronous motor open-phase detection method based on two-section positioning
CN114720785A (en) * 2022-06-13 2022-07-08 中山大洋电机股份有限公司 Motor with three-phase power supply open-phase detection function and power supply open-phase detection method

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Application publication date: 20200410