CN114528870A - Method for improving reliability of early turn-to-turn short circuit fault diagnosis of permanent magnet synchronous motor - Google Patents

Method for improving reliability of early turn-to-turn short circuit fault diagnosis of permanent magnet synchronous motor Download PDF

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CN114528870A
CN114528870A CN202210028620.0A CN202210028620A CN114528870A CN 114528870 A CN114528870 A CN 114528870A CN 202210028620 A CN202210028620 A CN 202210028620A CN 114528870 A CN114528870 A CN 114528870A
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尹忠刚
张哲�
罗培恩
刘静
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Xian University of Technology
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Abstract

The invention discloses a method for improving the reliability of early turn-to-turn short circuit fault diagnosis of a permanent magnet synchronous motor, which is implemented according to the following steps: step 1: establishing a mathematical model of turn-to-turn short circuit faults of the permanent magnet synchronous motor; step 2: designing a voltage disturbance observer for compensating power supply unbalance caused by an inverter according to a mathematical model of turn-to-turn short circuit faults of the permanent magnet synchronous motor; and step 3: and after compensation, extracting high-frequency current response under the injection of the high-frequency signal of the permanent magnet synchronous motor through a band-pass filter, and then performing coordinate transformation and low-pass filter to extract fault characteristics. The method solves the problems that the fault characteristics are not obvious in the early stage of turn-to-turn short circuit fault and the fault cannot be accurately detected.

Description

Method for improving reliability of early turn-to-turn short circuit fault diagnosis of permanent magnet synchronous motor
Technical Field
The invention belongs to the technical field of fault diagnosis of permanent magnet synchronous motors, and particularly relates to a method for improving reliability of early turn-to-turn short circuit fault diagnosis of a permanent magnet synchronous motor.
Background
Permanent Magnet Synchronous Motors (PMSM) have many advantages such as high power density, high efficiency, high torque density, and have been widely used in industrial production, daily life, and other occasions. Because the permanent magnet synchronous motor is in the working process, various faults are easy to occur due to the influences of factors such as narrow working environment space, high temperature, high humidity, poor heat dissipation condition, machinery, electricity and the like. The turn-to-turn short circuit fault is the most frequently occurring fault, and is highly destructive and is easy to cause other faults. After the turn-to-turn short circuit fault occurs, if the fault cannot be found in time and corresponding measures are taken in the initial stage of the fault, a more serious result is finally caused. In order to improve the safety and reliability of the permanent magnet synchronous motor, the early turn-to-turn short circuit fault diagnosis of the permanent magnet synchronous motor is very important. When the turn-to-turn short circuit fault is in an early stage, the fault characteristics are not obvious, and the fault characteristics are easily submerged in other harmonic signals and noise and are not easy to extract, so that great challenges are brought to diagnosis.
High-frequency voltage signal injection can amplify fault characteristics, when turn-to-turn short circuit fault occurs, short-circuit current can occur in a short-circuit winding, and the short-circuit current can form pulse vibration magnetic potential in an air gap to influence the high-frequency current generated by the high-frequency voltage. The fault characteristics adopted by the method are high in sensitivity to turn-to-turn short circuit faults and low in sensitivity to magnetic flux levels and load levels, so that the reliability of early diagnosis of the turn-to-turn short circuit faults can be greatly improved by using the fault characteristics. Due to the fact that non-ideal behaviors such as power supply imbalance and the like caused by the dead zone of the inverter can affect high-frequency current response, the accuracy of diagnosis is reduced, and the reliability of diagnosis can be improved by compensating the dead zone. The current compensation method comprises methods such as disturbance observer compensation, current feedback compensation and voltage feedback compensation, wherein dead zone compensation calculation based on the disturbance observer is simple, direct current side voltage and dead zone time do not need to be accurately known, online compensation can be achieved through the observer, system stability is not affected, hardware does not need to be added, and the compensation can be achieved only through software.
Disclosure of Invention
The invention aims to provide a method for improving the reliability of diagnosis of an early turn-to-turn short circuit fault of a permanent magnet synchronous motor, and solves the problems that the fault characteristics are not obvious in the early stage of the turn-to-turn short circuit fault and the fault cannot be accurately detected.
The technical scheme adopted by the invention is that the reliability of the diagnosis of the early turn-to-turn short circuit fault of the permanent magnet synchronous motor is improved, and the method is implemented according to the following steps:
step 1: establishing a mathematical model of turn-to-turn short circuit faults of the permanent magnet synchronous motor;
and 2, step: designing a voltage disturbance observer for compensating power supply unbalance caused by an inverter according to a mathematical model of turn-to-turn short circuit faults of the permanent magnet synchronous motor;
and step 3: after compensation, a high-frequency current response under the injection of a high-frequency signal of the permanent magnet synchronous motor is extracted through a band-pass filter, and then coordinate transformation and a low-pass filter are carried out to extract fault characteristics.
The present invention is also characterized in that,
the step 1 specifically comprises the following steps:
when the A phase of the motor has turn-to-turn short circuit fault, it can be known from fig. 1 that the A phase winding of the motor is added with a short circuit loop, and at this time, the resistor rfPhase a is divided into a healthy part and a failed part, and a short circuit turn ratio μ is defined as:
Figure BDA0003465506600000021
wherein N isfThe number of short circuit turns of a certain phase of stator winding, and N is the total number of turns of the certain phase of stator winding;
establishing a motor mathematical model according to a voltage equation of a fault motor of the permanent magnet synchronous motor:
Figure BDA0003465506600000031
wherein Vabcf＝[Vah Vb Vc Vaf]TIs the phase voltage matrix of the stator winding, where Vah、Vb、Vc、VafRespectively an A-phase healthy part voltage, an B, C-phase voltage and an A-phase fault part voltage; i.e. iabcf＝[ia ib ic if]TIs a current matrix ia、ib、rc、ifThree-phase stator currents and short respectivelyA path current; e.g. of the typem＝[eah eb ec eaf]TIs a back electromotive force matrix of three-phase stator windings and short-circuited windings, where eah、eb、ec、eafRespectively, the A phase healthy part back electromotive force, B, C back electromotive force and A phase fault part back electromotive force;
obtaining a voltage equation under a d-q axis system through coordinate transformation in the formula (2):
Figure BDA0003465506600000032
wherein u isd、uqIs d, q axis voltage, id、iqIs d, q axis current, Ld、LqIs d, q axis inductance, omega is motor speed, thetarIs the rotor position angle and λ is the stator flux linkage amplitude.
In the step 1:
Figure BDA0003465506600000033
formula (3) is a resistor matrix, wherein RsIs stator resistance rfIs the fault winding AfThe resistance of (1);
Figure BDA0003465506600000041
formula (4) is an inductance matrix, where Lah、Lb、Lc、LafAre respectively stator windings Ah、B、C、AfSelf-induction of (M)j-kIs the mutual inductance between the stator windings j, k (j ∈ { A [)h,B,C,Af},k∈{Ah,B,C,Af})。
The step 2 specifically comprises the following steps:
considering the influence of disturbance voltage caused by the dead zone effect of the inverter, a model of the permanent magnet synchronous motor in a d-q shafting can be obtained by the formula (5):
Figure BDA0003465506600000042
wherein u isd-f、uq-fD-axis disturbance voltage and q-axis disturbance voltage respectively, and the formula (6) is converted to obtain:
Figure BDA0003465506600000043
because the disturbance voltage caused by the dead zone is influenced by various actual conditions and is difficult to obtain directly, the disturbance voltage can be used as a state variable of a system, a disturbance observer is designed to estimate the disturbance voltage, a basic block diagram of the disturbance observer is shown in fig. 2, and formula (7) can be obtained through discretization:
Figure BDA0003465506600000044
Figure BDA0003465506600000045
x1(k)＝[id(k) iq(k)]T、x2(k)＝[ud-f(k) uq-f(k)]T (10)
Figure BDA0003465506600000051
Figure BDA0003465506600000052
in the design, the sampling period is very short, and the disturbance voltage is considered to be unchanged in one sampling period, namely:
x2(k)＝x2(k+1) (13)
with x2For an observed object, designing a dimension reduction disturbance observer as follows:
Figure BDA0003465506600000053
f is the gain matrix of the observer, and F can be equal to kI for decoupling the dq axis components2×2
Then:
Figure BDA0003465506600000054
Figure BDA0003465506600000055
Tsfor the sampling period, to ensure the stability of the system
Figure BDA0003465506600000056
Should satisfy:
Figure BDA0003465506600000057
namely:
Figure BDA0003465506600000061
the step 3 specifically comprises the following steps:
injecting a voltage vector with high-frequency rotation constant amplitude, and superposing the voltage vector on the original voltage, wherein the high-frequency voltage is expressed as:
Figure BDA0003465506600000062
wherein ViIs the amplitude of the high-frequency voltage, omegaiA frequency that is a high frequency voltage;
the high frequency current response generated by the high frequency voltage under the healthy motor is as follows:
Figure BDA0003465506600000063
in the formula
Figure BDA0003465506600000064
In the event of a turn-to-turn short circuit fault, neglecting the stator resistance can be obtained from equation (2) because the voltage frequency is very high:
ua＝pλah＝p[Lahia+Mah-bib+Mah-cic+μLahif] (21)
the voltage equation in the short circuit loop is:
rafia+(raf+rf)if＝-pλaf＝-pμλah (22)
where p is a differential operator, λah、λafThe flux linkage amplitudes of the healthy part and the fault part of the phase A respectively are obtained by combining the formula (19):
Figure BDA0003465506600000065
when turn-to-turn short circuit fault is in initial stagef＞＞rafNeglecting rafAnd the phase of the short-circuit current is opposite to that of the phase voltage, the expression of the short-circuit current is as follows:
Figure BDA0003465506600000071
the high-frequency current response generated by the high-frequency voltage obtained by the current response through the band-pass filter under the static coordinate system is as follows:
Figure BDA0003465506600000072
the current is set to a rotation speed of omegaiIn a rotating coordinate system of (2), fault features can be characterizedConverting the voltage into a direct current and the other components are high-frequency alternating current, and filtering the high-frequency components by using a low-pass filter to obtain fault characteristics for diagnosis:
Figure BDA0003465506600000073
the invention has the beneficial effects that:
compared with other fault diagnosis methods, the method for improving the reliability of the early turn-to-turn short circuit fault diagnosis of the permanent magnet synchronous motor amplifies the fault characteristics through high-frequency signal injection, selects the current response with high fault sensitivity as the fault characteristics, and achieves the purpose of accurately diagnosing the early turn-to-turn short circuit fault. The unbalanced power supply of the inverter can generate negative sequence current to influence the accuracy of fault diagnosis, and the unbalanced power supply is eliminated through the voltage disturbance observer, so that the reliability of diagnosis is improved.
Drawings
FIG. 1 is a circuit diagram of an equivalent turn-to-turn short circuit fault circuit employed in the present invention;
FIG. 2 is a block diagram of a voltage disturbance observer employed in the present invention;
fig. 3 is a block diagram of high frequency signal injection based on a voltage disturbance observer in the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention discloses a method for improving the reliability of early turn-to-turn short circuit fault diagnosis of a permanent magnet synchronous motor, which is implemented according to the following steps:
step 1: establishing a motor mathematical model under the condition of PMSM turn-to-turn short circuit fault, specifically:
when the A phase of the motor has turn-to-turn short circuit fault, the equivalent circuit of turn-to-turn short circuit fault is used, as shown in fig. 1, it can be known from fig. 1 that the A phase winding of the motor is added with a short circuit loop, and at this time, the resistor rfPhase a is divided into a healthy part and a failed part, and a short circuit turn ratio μ is defined as:
Figure BDA0003465506600000081
wherein N isfThe number of short circuit turns of a certain phase of stator winding, and N is the total number of turns of the certain phase of stator winding;
establishing a motor mathematical model according to a fault motor voltage equation of the permanent magnet synchronous motor:
Figure BDA0003465506600000082
wherein Vabcf＝[Vah Vb Vc Vaf]TIs the phase voltage matrix of the stator winding, where Vah、Vb、Vc、VafRespectively an A-phase healthy part voltage, an B, C-phase voltage and an A-phase fault part voltage; i.e. iabcf＝[ia ib ic if]TIs a current matrix ia、ib、ic、ifThree-phase stator current and short-circuit current respectively; e.g. of the typem＝[eah eb ec eaf]TIs a back electromotive force matrix of three-phase stator windings and short-circuited windings, where eah、eb、ec、eafRespectively, the A phase healthy part back electromotive force, B, C back electromotive force and A phase fault part back electromotive force;
Figure BDA0003465506600000091
formula (3) is a resistor matrix, wherein RsIs stator resistance rfIs the fault winding AfThe resistance of (1);
Figure BDA0003465506600000092
formula (4) is an inductance matrix, where Lah、Lb、Lc、LafAre respectively stator windingsAh、B、C、AfSelf-induction of (M)j-kIs the mutual inductance between the stator windings j, k (j e { A)h,B,C,Af},k∈{Ah,B,C,Af})；
Obtaining a voltage equation under a d-q axis system through coordinate transformation in the formula (2):
Figure BDA0003465506600000093
wherein u isd、uqIs d, q-axis voltage, id、iqIs d, q axis current, Ld、LqIs d, q axis inductance, omega is motor speed, thetarIs the rotor position angle and λ is the stator flux linkage amplitude.
Step 2: designing a voltage disturbance observer for compensating power supply unbalance caused by an inverter according to a mathematical model of turn-to-turn short circuit faults of the permanent magnet synchronous motor;
the step 2 specifically comprises the following steps:
considering the influence of disturbance voltage caused by the dead zone effect of the inverter, a model of the permanent magnet synchronous motor in a d-q shafting can be obtained by the formula (5):
Figure BDA0003465506600000094
wherein u isd-f、uq-fD-axis disturbance voltage and q-axis disturbance voltage respectively, and the formula (6) is converted to obtain:
Figure BDA0003465506600000101
because the disturbance voltage caused by the dead zone is influenced by various actual conditions and is difficult to obtain directly, the disturbance voltage can be used as a state variable of a system, a disturbance observer is designed to estimate the disturbance voltage, a basic block diagram of the disturbance observer is shown in fig. 2, and formula (7) can be obtained through discretization:
Figure BDA0003465506600000102
Figure BDA0003465506600000103
x1(k)＝[id(k) iq(k)]T、x2(k)＝[ud-f(k) uq-f(k)]T (10)
Figure BDA0003465506600000104
Figure BDA0003465506600000105
in the design, the sampling period is very short, and the disturbance voltage is considered to be unchanged in one sampling period, namely:
x2(k)＝x2(k+1) (13)
with x2For an observed object, designing a dimension reduction disturbance observer as follows:
Figure BDA0003465506600000106
f is the gain matrix of the observer, and F can be equal to kI for decoupling the dq axis components2×2
Then:
Figure BDA0003465506600000111
Figure BDA0003465506600000112
Tsfor the sampling period, to ensure the stability of the system
Figure BDA0003465506600000113
Should satisfy:
Figure BDA0003465506600000114
namely:
Figure BDA0003465506600000115
and step 3: after compensation, a high-frequency current response under the injection of a high-frequency signal of the permanent magnet synchronous motor is extracted through a band-pass filter, and then coordinate transformation and a low-pass filter are carried out to extract fault characteristics.
The step 3 specifically comprises the following steps:
injecting a voltage vector with high-frequency rotation constant amplitude, and superposing the voltage vector on the original voltage, wherein the high-frequency voltage is expressed as:
Figure BDA0003465506600000116
wherein ViIs the amplitude of the high-frequency voltage, omegaiA frequency that is a high frequency voltage;
the high frequency current response generated by the high frequency voltage under the healthy motor is as follows:
Figure BDA0003465506600000121
in the formula
Figure BDA0003465506600000122
In the event of a turn-to-turn short circuit fault, neglecting the stator resistance can be obtained from equation (2) because the voltage frequency is very high:
ua＝pλah＝p[Lahia+Mah-bib+Mah-cic+μLahif] (21)
the voltage equation in the short circuit loop is:
rafia+(raf+rf)if＝-pλaf＝-pμλah (22)
where p is a differential operator, λah、λafThe flux linkage amplitudes of the healthy part and the fault part of the phase A respectively are obtained by combining the formula (19):
Figure BDA0003465506600000123
when turn-to-turn short circuit fault is in initial stagef＞＞rafNeglecting rafAnd the phase of the short-circuit current is opposite to that of the phase voltage, the expression of the short-circuit current is as follows:
Figure BDA0003465506600000124
the high-frequency current response generated by the high-frequency voltage obtained by the current response through the band-pass filter under the static coordinate system is as follows:
Figure BDA0003465506600000125
the current is set to a rotation speed of omegaiIn the rotating coordinate system, the fault characteristics can be converted into a direct current quantity, the other components are high-frequency alternating current quantities, and a low-pass filter is used for filtering the high-frequency components to obtain the fault characteristics for diagnosis:
Figure BDA0003465506600000131
a control block diagram of a system for improving the reliability of early turn-to-turn fault diagnosis of a permanent magnet synchronous motor is shown in FIG. 3, and the system is based on vector control and uses ud-f、uq-fObtaining a disturbance voltage estimated value for an observed object by a voltage disturbance observer (such as figure 2)
Figure BDA0003465506600000132
Feedback pair ud、uqThe compensation is carried out to avoid the unbalance of the power supply of the inverter. Injecting high-frequency signals with variable amplitude and frequency into an alpha beta coordinate system, detecting three-phase currents under a three-phase static coordinate system by using three Hall current sensors, wherein the three-phase currents comprise base frequency currents and high-frequency currents, and converting the static three-phase currents into currents i under a two-phase static coordinate system through Clarkα、iβA high-frequency response current i is obtained through the processing of a band-pass filterαh、iβhThe high-frequency current passing angle is taken as omegaiAnd (3) converting the similar Park coordinates of the t to obtain a current positive sequence component, a current negative sequence component and a fault component, wherein only the fault component is a direct current component at the moment, and filtering the alternating current component through a low-pass filter to obtain the direct current component for fault diagnosis. According to the method for improving the reliability of the early turn-to-turn fault diagnosis of the permanent magnet synchronous motor, the problem of unbalanced power supply of the inverter is compensated through the voltage disturbance observer, the influence of the nonlinearity of the inverter on the fault characteristics is avoided, and the reliability of the fault diagnosis is improved. High-frequency voltage signals are injected to amplify fault characteristics, and turn-to-turn short circuit fault early diagnosis is realized by extracting direct current fault characteristic current response with high fault sensitivity.

Claims (5)

1. The method for improving the reliability of the early turn-to-turn short circuit fault diagnosis of the permanent magnet synchronous motor is characterized by comprising the following steps:
step 1: establishing a mathematical model of turn-to-turn short circuit faults of the permanent magnet synchronous motor;
and 2, step: designing a voltage disturbance observer for compensating power supply unbalance caused by an inverter according to a mathematical model of turn-to-turn short circuit faults of the permanent magnet synchronous motor;
and step 3: after compensation, a high-frequency current response under the injection of a high-frequency signal of the permanent magnet synchronous motor is extracted through a band-pass filter, and then coordinate transformation and a low-pass filter are carried out to extract fault characteristics.
2. The method for improving reliability of the early turn-to-turn short circuit fault diagnosis of the permanent magnet synchronous motor according to claim 1, wherein the step 1 specifically comprises:
when the A phase of the motor has turn-to-turn short circuit fault, it can be known from fig. 1 that the A phase winding of the motor is added with a short circuit loop, and at this time, the resistor rfPhase a is divided into a healthy part and a failed part, and a short circuit turn ratio μ is defined as:
Figure FDA0003465506590000011
wherein N isfThe number of short circuit turns of a certain phase of stator winding, and N is the total number of turns of the certain phase of stator winding;
establishing a motor mathematical model according to a voltage equation of a fault motor of the permanent magnet synchronous motor:
Figure FDA0003465506590000012
wherein Vabcf＝[Vah Vb Vc Vaf]TIs the phase voltage matrix of the stator winding, where Vah、Vb、Vc、VafRespectively an A-phase healthy part voltage, an B, C-phase voltage and an A-phase fault part voltage; i.e. iabcf＝[ia ib ic if]TIs a current matrix ia、ib、ic、ifThree-phase stator current and short-circuit current respectively; e.g. of a cylinderm＝[eah eb ec eaf]TIs a back electromotive force matrix of three-phase stator windings and short-circuited windings, where eah、eb、ec、eafRespectively, the A phase healthy part back electromotive force, B, C back electromotive force and A phase fault part back electromotive force;
obtaining a voltage equation under a d-q axis system through coordinate transformation in the formula (2):
Figure FDA0003465506590000021
wherein u isd、uqIs d, q-axis voltage, id、iqIs d, q axis current, Ld、LqIs d, q axis inductance, omega is motor speed, thetarIs the rotor position angle and λ is the stator flux linkage amplitude.
3. The method for improving the reliability of the early turn-to-turn short circuit fault diagnosis of the permanent magnet synchronous motor according to claim 2, wherein in the step 1:
Figure FDA0003465506590000022
formula (3) is a resistor matrix, wherein RsIs stator resistance rfIs fault winding AfThe resistance of (1);
Figure FDA0003465506590000023
formula (4) is an inductance matrix, where Lah、Lb、Lc、LafRespectively a stator winding Ah、B、C、AfSelf-induction of (M)j-kIs the mutual inductance between the stator windings j, k (j e { A)h,B,C,Af},k∈{Ah,B,C,Af})。
4. The method for improving reliability of the early turn-to-turn short circuit fault diagnosis of the permanent magnet synchronous motor according to claim 3, wherein the step 2 specifically comprises:
the model of the permanent magnet synchronous motor under the d-q axis system can be obtained by the formula (5):
Figure FDA0003465506590000031
wherein u isd-f、uq-fAre d and q axes respectivelyThe disturbance voltage is obtained by converting equation (6):
Figure FDA0003465506590000032
designing a disturbance observer to estimate the disturbance voltage, wherein a basic block diagram is shown in fig. 2, and equation (7) is discretized to obtain:
Figure FDA0003465506590000033
Figure FDA0003465506590000034
x1(k)＝[id(k) iq(k)]T、x2(k)＝[ud-f(k) uq-f(k)]T (10)
Figure FDA0003465506590000035
Figure FDA0003465506590000036
in the design, the sampling period is very short, and the disturbance voltage is considered to be unchanged in one sampling period, namely:
x2(k)＝x2(k+1) (13)
with x2For an observed object, designing a dimension reduction disturbance observer as follows:
Figure FDA0003465506590000041
f is the gain matrix of the observer, and F can be equal to kI for decoupling the dq axis components2×2
Then:
Figure FDA0003465506590000042
Figure FDA0003465506590000043
Tsfor the sampling period, to ensure the stability of the system
Figure FDA0003465506590000044
Should satisfy:
Figure FDA0003465506590000045
namely:
Figure FDA0003465506590000046
5. the method for improving reliability of the early turn-to-turn short circuit fault diagnosis of the permanent magnet synchronous motor according to claim 4, wherein the step 3 specifically comprises:
injecting a voltage vector with high-frequency rotation constant amplitude, and superposing the voltage vector on the original voltage, wherein the high-frequency voltage is expressed as:
Figure FDA0003465506590000047
wherein ViIs the amplitude of the high-frequency voltage, omegaiA frequency that is a high frequency voltage;
the high frequency current response generated by the high frequency voltage under the healthy motor is as follows:
Figure FDA0003465506590000051
in the formula
Figure FDA0003465506590000052
In the event of a turn-to-turn short circuit fault, neglecting the stator resistance can be obtained from equation (2) because the voltage frequency is very high:
ua＝pλah＝p[Lahia+Mah-bib+Mah-cic+μLahif] (21)
the voltage equation in the short circuit loop is:
rafia+(raf+rf)if＝-pλaf＝-pμλah (22)
where p is a differential operator, λah、λafThe flux linkage amplitudes of the healthy part and the fault part of the phase A respectively are obtained by combining the formula (19):
Figure FDA0003465506590000053
when turn-to-turn short circuit fault is in initial stagef＞＞rafNeglecting rafAnd the phase of the short-circuit current is opposite to that of the phase voltage, the expression of the short-circuit current is as follows:
Figure FDA0003465506590000054
the high-frequency current response generated by the high-frequency voltage obtained by the current response through the band-pass filter under the static coordinate system is as follows:
Figure FDA0003465506590000055
the current is set to a rotation speed of omegaiScrew ofIn a coordinate transformation system, after low-pass filter processing is used:
Figure FDA0003465506590000061
and converting the fault characteristics into a direct current, wherein the other components are high-frequency alternating current, and filtering the high-frequency components by using a low-pass filter to obtain the fault characteristics for diagnosis.
CN202210028620.0A 2022-01-11 2022-01-11 Method for improving reliability of early turn-to-turn short circuit fault diagnosis of permanent magnet synchronous motor Pending CN114528870A (en)

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CN115951270A (en) * 2023-03-15 2023-04-11 东南大学 Method for diagnosing connection fault of external cable of permanent magnet synchronous motor
CN117054928A (en) * 2023-10-11 2023-11-14 安徽大学 Motor turn-to-turn short circuit fault diagnosis system and method and new energy automobile

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115951270A (en) * 2023-03-15 2023-04-11 东南大学 Method for diagnosing connection fault of external cable of permanent magnet synchronous motor
CN117054928A (en) * 2023-10-11 2023-11-14 安徽大学 Motor turn-to-turn short circuit fault diagnosis system and method and new energy automobile
CN117054928B (en) * 2023-10-11 2023-12-29 安徽大学 Motor turn-to-turn short circuit fault diagnosis system and method and new energy automobile

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