CN114690036A - Method for positioning local demagnetization fault of permanent magnet synchronous motor - Google Patents
Method for positioning local demagnetization fault of permanent magnet synchronous motor Download PDFInfo
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 110
- 230000005347 demagnetization Effects 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000010183 spectrum analysis Methods 0.000 claims abstract description 5
- 238000004804 winding Methods 0.000 claims description 27
- 230000002776 aggregation Effects 0.000 claims description 6
- 238000004220 aggregation Methods 0.000 claims description 6
- 239000010410 layer Substances 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 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
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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
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
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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
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
- H02P6/18—Circuit arrangements for detecting position without separate position detecting elements
- H02P6/182—Circuit arrangements for detecting position without separate position detecting elements using back-emf in windings
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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
- H02P2203/00—Indexing scheme relating to controlling arrangements characterised by the means for detecting the position of the rotor
- H02P2203/03—Determination of the rotor position, e.g. initial rotor position, during standstill or low speed operation
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- General Physics & Mathematics (AREA)
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- Control Of Ac Motors In General (AREA)
Abstract
The invention discloses a method for positioning a local demagnetization fault of a permanent magnet synchronous motor. The method comprises the following steps: measuring the back electromotive force of the permanent magnet synchronous motor when the permanent magnet synchronous motor operates at a rated rotating speed, and performing frequency spectrum analysis to obtain a fractional fault harmonic wave and a corresponding phase when the permanent magnet synchronous motor operates; selecting a plurality of fractional fault harmonics with amplitudes larger than a preset amplitude threshold value as positioning harmonics of local demagnetization faults of the permanent magnet synchronous motor, and extracting phases corresponding to the positioning harmonics as positioning phases; drawing a phase relation result graph through the positioning phase, wherein the phase relation result graph is the fault positioning phase of the same demagnetization position; and carrying out joint analysis on the phase relation result graph to position the demagnetization position of the permanent magnet synchronous motor. The invention realizes the quick positioning of the local demagnetization fault position without dismantling the rotor, thereby helping maintenance and repair personnel to remove the demagnetization fault as soon as possible.
Description
Technical Field
The invention relates to a local demagnetization fault positioning method for a permanent magnet synchronous motor in the field of fault diagnosis of the permanent magnet synchronous motor, and particularly provides a local demagnetization fault positioning method for the permanent magnet synchronous motor based on motor back electromotive force fractional fault harmonic phase analysis.
Background
Local demagnetization is one of common faults of the permanent magnet synchronous motor, and the service life and aging of a rotor permanent magnet can cause the local demagnetization fault when the permanent magnet synchronous motor runs under severe working conditions such as high temperature and large current for a long time. When the motor has a local demagnetization fault, the health state of the motor can be known by timely diagnosing the fault and determining the fault position, and maintenance and repair personnel can be helped to remove the fault as soon as possible. The existing literature indicates that when a local demagnetization fault occurs in a permanent magnet synchronous motor, the fault location can be diagnosed by means of direct magnetic field measurement and the like. However, the magnetic field measurement for the local demagnetization fault of the permanent magnet synchronous motor needs to perform three-dimensional magnetic field measurement on the detached rotor, and is easily subjected to electromagnetic interference between the measurement distance and the environment, which is very inconvenient. At present, a method capable of carrying out local demagnetization fault location on the whole permanent magnet synchronous motor is available.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a permanent magnet synchronous motor local demagnetization fault positioning method based on motor back electromotive force fractional fault harmonic phase analysis.
The technical scheme adopted by the invention is as follows:
the local demagnetization fault positioning method comprises the following steps:
1) and driving a permanent magnet synchronous motor with local demagnetization, and measuring the back electromotive force of the permanent magnet synchronous motor when the permanent magnet synchronous motor operates at a rated rotating speed.
2) And carrying out spectrum analysis on the measured back electromotive force to obtain the fractional fault harmonic and the corresponding phase when the permanent magnet synchronous motor operates at a plurality of moments.
3) Selecting a plurality of fractional fault harmonics with amplitudes larger than a preset amplitude threshold value from the fractional fault harmonics at all moments as positioning harmonics of the local demagnetization fault of the permanent magnet synchronous motor to obtain a better detection result, and extracting phases corresponding to the positioning harmonics from all the phases in the step 2) as positioning phases.
4) And drawing a phase relation result graph of every two fractional fault harmonics in the positioning harmonics through the positioning phase, wherein each phase relation result graph is the fault positioning phase of the permanent magnet synchronous motor at the same demagnetization position.
5) And (4) performing joint analysis on all the phase relation result graphs obtained in the step 4), generating different phases when permanent magnets at different positions of the permanent magnet synchronous motor generate local demagnetization, determining the numerical range of the fault positioning phase through the joint analysis of all the phase relation result graphs, and positioning the demagnetization position of the permanent magnet synchronous motor.
In the step 1), the fourier series form of the reverse a potential of the permanent magnet synchronous motor when local demagnetization occurs is as follows:
where n is the order of the Fourier series, j is the complex unit, θmIs the mechanical rotor position angle, αnIs the phase angle, kwnIs the winding correlation coefficient, kmnIs the permanent magnet correlation coefficient, w is the English initial of winding, m is the English initial of permanent magnet, EnIs the opposite potential magnitude of order n.
Correlation coefficient k of windingwnAs shown in the following formula:
where Ncoil is the number of A-phase winding coils, q is the winding coil number, and θqIs the A-phase winding coil mounting position angle, DqIs the phase a winding coil direction.
Permanent magnet correlation coefficient kmnAs shown in the following formula:
where i is the permanent magnet number, p is the motor pole pair number, δiIs the compensation angle m of the asymmetrical magnetic field distribution in the space of the permanent magnet synchronous motor caused by local demagnetizationiRepresenting the demagnetization coefficient;
n-order phase of opposite potential of A
As shown in the following formula:
where Angle is the argument of the complex number.
In the step 1), when the permanent magnet synchronous motor is a single-layer winding, the number ratio of the slot poles of the permanent magnet synchronous motor is not a multiple of 3; when the permanent magnet synchronous motor is a double-layer winding, the slot pole ratio of the permanent magnet synchronous motor is not a multiple of 3/2, and the condition that fractional fault harmonics can occur in the back electromotive force of the permanent magnet synchronous motor after a local demagnetization fault occurs is met.
In the step 1), only one permanent magnet of the permanent magnet synchronous motor generates a demagnetization phenomenon.
And in the step 5), when the numbers of the slot poles of the permanent magnet synchronous motor are relatively prime, all fault positioning phases in all phase relation result graphs in the step 4) correspond to the fault positioning phases of fractional fault harmonics of a locally demagnetized permanent magnet in the permanent magnet synchronous motor, and the positions of the locally demagnetized permanent magnet in the permanent magnet synchronous motor are positioned according to the numerical range of the fault positioning phases.
When the greatest common divisor gcd (s, p) of the slot pole number of the permanent magnet synchronous motor is greater than 1, s is the slot number, and p is the pole number, dividing each unit motor of the permanent magnet synchronous motor into a plurality of symmetrical units, wherein the symmetrical units are gcd (s, p) in total, and combining permanent magnets at corresponding positions of each symmetrical unit to form a set unit, and the set unit is gcd (s, p) in total; and 4) all fault positioning phases in all phase relation result graphs in the step 4) correspond to the fault positioning phases of the fractional fault harmonic of one aggregation unit of local demagnetization in the permanent magnet synchronous motor, and the positions of the aggregation units of the local demagnetization permanent magnets in the permanent magnet synchronous motor are positioned according to the numerical range of the fault positioning phases.
The numerical range of the fault positioning phase is that when the number of the slot poles of the permanent magnet synchronous motor is relatively prime, the fault positioning phase can be accurately positioned to the position of a local demagnetization permanent magnet in the permanent magnet synchronous motor; when the maximum common divisor of the number of the slot poles of the permanent magnet synchronous motor is greater than 1, the numerical range of the fault positioning phase can be accurately positioned to the position of the corresponding collection unit of the local demagnetization permanent magnet in the permanent magnet synchronous motor, and cannot be positioned to the position of the corresponding symmetric unit of the local demagnetization permanent magnet in the permanent magnet synchronous motor.
In the step 5), the number of the permanent magnets in one set unit is equal to the greatest common divisor gcd (s, p) of the number of the slot poles of the permanent magnet synchronous motor.
The invention has the beneficial effects that:
the invention discloses a method for positioning a local demagnetization fault by combining fractional fault harmonic phase analysis of counter electromotive force of a permanent magnet synchronous motor. The difficulty of positioning local demagnetization faults through direct magnetic field measurement can be avoided, and the fault positioning of local demagnetization can be realized without dismantling the rotor. The method can quickly determine the position of the local demagnetization fault, thereby helping maintenance and repair personnel to remove the fault as soon as possible.
Drawings
FIG. 1 is a structural view of motor No. 1 according to an embodiment of the present invention;
FIG. 2 is a structural diagram of motor No. 2 according to an embodiment of the present invention;
FIG. 3 is a graph of the phase analysis results of fractional harmonic faults for motor # 1 in accordance with an embodiment of the present invention;
fig. 4 is a phase analysis result graph of fractional fault harmonics of motor No. 2 in accordance with an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
The method comprises the following steps:
1) driving a permanent magnet synchronous motor with local demagnetization, wherein the permanent magnet synchronous motor only has a demagnetization phenomenon of one permanent magnet, and measuring the back electromotive force of the permanent magnet synchronous motor when the permanent magnet synchronous motor runs at a rated rotating speed; when the permanent magnet synchronous motor is a single-layer winding, the number ratio of the slot poles of the permanent magnet synchronous motor is not a multiple of 3; when the permanent magnet synchronous motor is a double-layer winding, the slot pole ratio of the permanent magnet synchronous motor is not a multiple of 3/2, and the condition that fractional fault harmonics can occur in the back electromotive force of the permanent magnet synchronous motor after a local demagnetization fault occurs is met.
The Fourier series form of the A reverse potential of the permanent magnet synchronous motor when local demagnetization occurs is as follows:
where n is the order of the Fourier series, j is the complex unit, θmIs the mechanical rotor position angle, αnIs the phase angle, kwnIs the winding correlation coefficient, kmnIs the permanent magnet correlation coefficient, w is the English initial of winding, m is the English initial of permanent magnet, EnIs the opposite potential magnitude of order n.
Correlation coefficient k of windingwnAs shown in the following formula:
where Ncoil is the number of A-phase winding coils, q is the winding coil number, and θqIs the A-phase winding coil mounting position angle, DqIs the phase a winding coil direction.
Permanent magnet correlation coefficient kmnAs shown in the following formula:
where i is the permanent magnet number, p is the motor pole pair number, δiIs the compensation angle m of the asymmetrical magnetic field distribution in the space of the permanent magnet synchronous motor caused by local demagnetizationiRepresenting the demagnetization factor.
N-order phase of opposite potential of A
As shown in the following formula:
where Angle is the argument of the complex number.
2) And carrying out spectrum analysis on the measured back electromotive force to obtain the fractional fault harmonic and the corresponding phase when the permanent magnet synchronous motor operates at a plurality of moments.
3) Selecting a plurality of fractional fault harmonics with amplitudes larger than a preset amplitude threshold value from the fractional fault harmonics at all moments as positioning harmonics of the local demagnetization fault of the permanent magnet synchronous motor to obtain a better detection result, and extracting phases corresponding to the positioning harmonics from all the phases in the step 2) as positioning phases.
4) And drawing a phase relation result graph of every two fractional fault harmonics in the positioning harmonics through the positioning phase, wherein each phase relation result graph is the fault positioning phase of the permanent magnet synchronous motor at the same demagnetization position.
5) And 4) performing joint analysis on all the phase relation result graphs obtained in the step 4), determining the numerical range of the fault positioning phase through the joint analysis of all the phase relation result graphs, and positioning the demagnetization position of the permanent magnet synchronous motor.
When the slot poles of the permanent magnet synchronous motor are relatively prime, all fault locating phases in all phase relation result graphs in the step 4) correspond to the fault locating phase of the fractional fault harmonic of one locally demagnetized permanent magnet in the permanent magnet synchronous motor, and the position of the locally demagnetized permanent magnet in the permanent magnet synchronous motor is located according to the numerical range of the fault locating phase.
When the greatest common divisor gcd (s, p) of the slot pole number of the permanent magnet synchronous motor is more than 1, s is the slot number, and p is the pole number, dividing each unit motor of the permanent magnet synchronous motor into a plurality of symmetrical units, wherein the symmetrical units are gcd (s, p) in total, combining permanent magnets at corresponding positions of each symmetrical unit to form a set unit, the set unit is gcd (s, p) in total, and the number of the permanent magnets in the set unit is equal to the greatest common divisor gcd (s, p) of the slot pole number of the permanent magnet synchronous motor; and 4) all fault positioning phases in all phase relation result graphs in the step 4) correspond to the fault positioning phases of the fractional fault harmonic of one aggregation unit of local demagnetization in the permanent magnet synchronous motor, and the positions of the aggregation units of the local demagnetization permanent magnets in the permanent magnet synchronous motor are positioned according to the numerical range of the fault positioning phases.
The specific embodiment of the invention is as follows:
in order to verify the reliability of the method, the invention carries out relevant experiments. The parameters of two permanent magnet synchronous motors used as examples in the experiment are shown in table 1 below, and the winding and permanent magnet distribution structures of the two permanent magnet synchronous motors are respectively shown in fig. 1 and fig. 2. The biggest difference between the No. 1 motor and the No. 2 motor is that the number of poles of the No. 1 motor slot is relatively prime, the number of poles of the No. 2 motor slot is not relatively prime, and the greatest common divisor is 6.
TABLE 1 Motor parameters
| Electric machine | No. 1 motor | No. 2 motor |
| Number of |
8 | 42 |
| Number of grooves | 9 | 36 |
| Rated speed of rotation | 1000rpm | 1000rpm |
The positioning processing process of the local demagnetization fault comprises the following steps:
1) driving a permanent magnet synchronous motor with local demagnetization, and measuring the back electromotive force of the permanent magnet synchronous motor when the permanent magnet synchronous motor operates at a rated rotating speed;
2) carrying out spectrum analysis on the measured back electromotive force to obtain a fractional fault harmonic and a corresponding phase when the permanent magnet synchronous motor operates at a plurality of moments;
3) in order to obtain a better detection effect, a plurality of fractional fault harmonics with amplitude values larger than a preset amplitude threshold value in the fractional fault harmonics at all times are selected as positioning harmonics of the local demagnetization faults of the permanent magnet synchronous motor. For motor number 1, 2/4 fault harmonics and 5/4 fault harmonics are selected as positioning harmonics; for the No. 2 motor, 15/21 fault harmonics and 3/21 fault harmonics are selected as positioning harmonics, and phases corresponding to the positioning harmonics are extracted as positioning phases.
As shown in fig. 3 and 4, the phase relationship result graphs of the fractional fault harmonics of all the permanent magnets of motor No. 1 and the phase relationship result graphs of the fractional fault harmonics of all the collective units of motor No. 2 are shown, respectively. It can be found that the slot pole numbers of the No. 1 motor are relatively prime, and the local demagnetization fault can be accurately positioned to one permanent magnet from PM1 to PM8 through the phases of 2/4 and 5/4 fault harmonics; the number of slot poles of motor No. 2 is not prime, the maximum common divisor of the number of slot poles of motor No. 2 is gcd (36, 42) ═ 6, motor No. 2 has 6 symmetrical units, as shown in fig. 2, 3 space completely symmetrical unit motors in motor No. 2, each unit motor contains 2 symmetrical units, it cannot be judged in which symmetrical unit the local demagnetization fault is located through the phase of 15/21 times and 3/21 times fault harmonics, but the local demagnetization fault can be positioned in one of the set units (for example, a set unit consisting of PM1, PM8, PM15, PM22, PM29 and PM 36).
Claims (7)
1. A permanent magnet synchronous motor local demagnetization fault location method is characterized in that:
the method comprises the following steps:
1) driving a permanent magnet synchronous motor with local demagnetization, and measuring the back electromotive force of the permanent magnet synchronous motor when the permanent magnet synchronous motor operates at a rated rotating speed;
2) carrying out spectrum analysis on the measured back electromotive force to obtain a fractional fault harmonic and a corresponding phase when the permanent magnet synchronous motor operates at a plurality of moments;
3) selecting a plurality of fractional fault harmonics with amplitudes larger than a preset amplitude threshold value from the fractional fault harmonics at all moments as positioning harmonics of the local demagnetization fault of the permanent magnet synchronous motor, and extracting phases corresponding to the positioning harmonics from all the phases in the step 2) as positioning phases;
4) drawing a phase relation result graph of every two fractional fault harmonics in the positioning harmonics through the positioning phases, wherein each phase relation result graph is a fault positioning phase of the permanent magnet synchronous motor at the same demagnetization position;
5) and 4) performing joint analysis on all the phase relation result graphs obtained in the step 4), determining the numerical range of the fault positioning phase through the joint analysis of all the phase relation result graphs, and positioning the demagnetization position of the permanent magnet synchronous motor.
2. The method for positioning the local demagnetization fault of the permanent magnet synchronous motor according to claim 1, is characterized in that:
in the step 1), the fourier series form of the reverse a potential of the permanent magnet synchronous motor when local demagnetization occurs is as follows:
where n is the order of the Fourier series, j is the complex unit, θmIs the mechanical rotor position angle, αnIs the phase angle, kwnIs the winding correlation coefficient, kmnIs the permanent magnet correlation coefficient, EnIs an n-order opposite potential magnitude;
correlation coefficient k of windingwnAs shown in the following formula:
where Ncoil is the number of A-phase winding coils, q is the winding coil number, and θqIs the A-phase winding coil mounting position angle, DqIs the phase a winding coil direction;
permanent magnet correlation coefficient kmnAs shown in the following formula:
where i is the permanent magnet number, p is the motor pole pair number, δiIs the compensation angle m of the asymmetrical magnetic field distribution in the space of the permanent magnet synchronous motor caused by local demagnetizationiRepresenting the demagnetization coefficient;
n-order phase of opposite potential of A
As shown in the following formula:
where Angle is the argument of the complex number.
3. The method for positioning the local demagnetization fault of the permanent magnet synchronous motor according to claim 1, is characterized in that:
in the step 1), when the permanent magnet synchronous motor is a single-layer winding, the number ratio of the slot poles of the permanent magnet synchronous motor is not a multiple of 3; when the permanent magnet synchronous motor is a double-layer winding, the slot pole ratio of the permanent magnet synchronous motor is not a multiple of 3/2.
4. The method for positioning the local demagnetization fault of the permanent magnet synchronous motor according to claim 1, is characterized in that:
in the step 1), only one permanent magnet of the permanent magnet synchronous motor generates a demagnetization phenomenon.
5. The method for positioning the local demagnetization fault of the permanent magnet synchronous motor according to claim 1, is characterized in that:
in the step 5), when the numbers of the slot poles of the permanent magnet synchronous motor are relatively prime, all fault locating phases in the result graph of all phase relations in the step 4) correspond to the fault locating phases of fractional fault harmonics of a locally demagnetized permanent magnet in the permanent magnet synchronous motor, and the positions of the locally demagnetized permanent magnet in the permanent magnet synchronous motor are located according to the numerical range of the fault locating phases;
when the greatest common divisor gcd (s, p) of the slot pole number of the permanent magnet synchronous motor is greater than 1, s is the slot number, and p is the pole number, dividing each unit motor of the permanent magnet synchronous motor into a plurality of symmetrical units, wherein the symmetrical units are gcd (s, p) in total, and combining permanent magnets at corresponding positions of each symmetrical unit to form a set unit, and the set unit is gcd (s, p) in total; and 4) all fault positioning phases in all phase relation result graphs in the step 4) correspond to the fault positioning phases of the fractional fault harmonic of one aggregation unit of local demagnetization in the permanent magnet synchronous motor, and the positions of the aggregation units of the local demagnetization permanent magnets in the permanent magnet synchronous motor are positioned according to the numerical range of the fault positioning phases.
6. The method for positioning the local demagnetization fault of the permanent magnet synchronous motor according to claim 5, is characterized in that:
the numerical range of the fault positioning phase is positioned to the position of a local demagnetization permanent magnet in the permanent magnet synchronous motor when the number of the slot poles of the permanent magnet synchronous motor is relatively prime; and when the maximum common divisor of the number of the slot poles of the permanent magnet synchronous motor is more than 1, the numerical range of the fault positioning phase is positioned to the position of the corresponding collection unit of the local demagnetization permanent magnet in the permanent magnet synchronous motor.
7. The method for positioning the local demagnetization fault of the permanent magnet synchronous motor according to claim 1, is characterized in that:
in the step 5), the number of the permanent magnets in one set unit is equal to the greatest common divisor gcd (s, p) of the number of the slot poles of the permanent magnet synchronous motor.
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|---|---|---|---|---|
| CN105974312A (en) * | 2016-06-06 | 2016-09-28 | 安徽大学 | Demagnetization fault diagnosis method for permanent magnet synchronous motor |
| CN107192947A (en) * | 2017-06-08 | 2017-09-22 | 重庆大学 | The permagnetic synchronous motor event diagnostic method monitored based on magnetic field |
| CN109239599A (en) * | 2018-10-07 | 2019-01-18 | 河南理工大学 | A kind of permanent magnet synchronous motor demagnetization method for diagnosing faults |
| CN109541461A (en) * | 2018-10-31 | 2019-03-29 | 重庆大学 | A kind of permanent magnet synchronous motor fault of eccentricity diagnostic method based on Distribution of Magnetic Field monitoring |
| CN110309535A (en) * | 2019-05-23 | 2019-10-08 | 中南大学 | A kind of permanent magnet part loss of excitation failure simulation method and fault injector |
| CN113295999A (en) * | 2021-06-24 | 2021-08-24 | 江苏大学 | Demagnetization, winding open circuit and turn-to-turn short circuit fault classification method for permanent magnet synchronous motor |
-
2022
- 2022-03-30 CN CN202210331599.1A patent/CN114690036B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105974312A (en) * | 2016-06-06 | 2016-09-28 | 安徽大学 | Demagnetization fault diagnosis method for permanent magnet synchronous motor |
| CN107192947A (en) * | 2017-06-08 | 2017-09-22 | 重庆大学 | The permagnetic synchronous motor event diagnostic method monitored based on magnetic field |
| CN109239599A (en) * | 2018-10-07 | 2019-01-18 | 河南理工大学 | A kind of permanent magnet synchronous motor demagnetization method for diagnosing faults |
| CN109541461A (en) * | 2018-10-31 | 2019-03-29 | 重庆大学 | A kind of permanent magnet synchronous motor fault of eccentricity diagnostic method based on Distribution of Magnetic Field monitoring |
| CN110309535A (en) * | 2019-05-23 | 2019-10-08 | 中南大学 | A kind of permanent magnet part loss of excitation failure simulation method and fault injector |
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