CN107024655A - A kind of permanent-magnetic synchronous motor stator winding failure diagnostic method - Google Patents
A kind of permanent-magnetic synchronous motor stator winding failure diagnostic method Download PDFInfo
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- CN107024655A CN107024655A CN201710220764.5A CN201710220764A CN107024655A CN 107024655 A CN107024655 A CN 107024655A CN 201710220764 A CN201710220764 A CN 201710220764A CN 107024655 A CN107024655 A CN 107024655A
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- G—PHYSICS
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- 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
- G01R31/346—Testing of armature or field windings
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Abstract
The invention discloses a kind of permanent-magnetic synchronous motor stator winding failure diagnostic method, first, the residual voltage and stator current of PMSM Drive System are gathered, and calculate the amplitude and starting phase angle of fundamental wave in residual voltage and stator current；Secondly, the amplitude and starting phase angle of fundamental wave in residual voltage and stator current are updated in the binary quadratic equation group on phase resistance deviation；Then, the binary quadratic equation group is solved, and using phase difference and the relation of phase resistance deviation, determines the suitable solution of the binary quadratic equation, is the resistance deviation per phase winding；Finally, realize that fault detect, faulty phase locating and fault degree are estimated using the resistance deviation of every phase winding of calculating.The present invention calculates simple, it is easy to accomplish, the degree of accuracy is high, can not only diagnose the unbalance failure of stator winding resistance, and can also position failure phase and fault degree.
Description
Technical field
The invention belongs to fault diagnosis technology field, especially a kind of side of permanent-magnetic synchronous motor stator winding failure diagnosis
Method.
Background technology
Permagnetic synchronous motor (Permanent magnet synchronous machine, PMSM) has power density
Height, efficiency high, torque ratio of inertias are big, speed-regulating range width the advantages of.In recent years, it is high-power in wind-power electricity generation, elevator drives etc.
And electric automobile and Digit Control Machine Tool etc. it is high-new can application scenario get the attention and use.
When permagnetic synchronous motor works, with complicated energy converting between mechanical process, in longtime running, by load behavior
With the influence of running environment, some parts gradually can fail or damage.Its typical fault part includes stator winding, conversion
38% failure is as caused by stator winding in key sensor of device, motor bearings and control system etc., wherein motor.
In stator winding faults, it is a kind of common failure that stator winding resistance is unbalance.When occurring the unbalance failure of early stage, electricity
Machine still can be continued to run with, if but can not in time detect and cause fault severity level to aggravate, motor speed etc. can be caused to produce
Concussion, if this failure is not detected in the early stage, failure will be aggravated, and be continuously increased the temperature of motor, finally led
Machine is sent a telegraph to damage completely.Accordingly, it would be desirable to diagnose the stator winding faults of permagnetic synchronous motor in time.At present, it has been proposed that
Certain methods are come the unbalance failure of stator winding resistance for diagnosing permagnetic synchronous motor, and most common of which method is based on stator electricity
Analysis method of stream and residual voltage signal etc..But this method for diagnosing faults has certain deficiency, event can not be such as judged
Hinder the fault degree of phase, especially failure to occur in the case of multiphase.
The content of the invention
The invention aims to overcome the deficiencies in the prior art, there is provided a kind of permanent-magnetic synchronous motor stator winding
Method for diagnosing faults, this method can not only diagnose the unbalance failure of stator winding resistance, and can also tracing trouble phase and estimation
Fault degree；This method calculates simple, it is easy to accomplish, the degree of accuracy is high.
The technical solution adopted by the present invention is：A kind of permanent-magnetic synchronous motor stator winding failure diagnostic method, including it is as follows
Step：
(1) residual voltage and stator current of PMSM Drive System are gathered, and calculates residual voltage and stator
The amplitude and starting phase angle of fundamental wave in electric current；
(2) amplitude and starting phase angle of fundamental wave in residual voltage and stator current are updated on phase resistance deviation
In binary quadratic equation group；
(3) the binary quadratic equation group is solved, and using phase difference and the relation of phase resistance deviation, determines the dihydric phenol
The suitable solution of equation, is the resistance deviation per phase winding；
(4) realize that fault detect, faulty phase locating and fault degree are estimated using the resistance deviation of every phase winding of calculating.
Preferably, the binary quadratic equation group in the step (2) on phase resistance deviation is：
In formula：V1It is the amplitude and starting phase angle of fundamental wave in residual voltage, I with αaAnd θaIt is stator current iaIn width
Value and starting phase angle, IbAnd θβIt is i in stator currentbIn amplitude and starting phase angle, Δ RaWith Δ RbIt is that a phases are fixed with b phases
The resistance deviation of sub- winding.Wherein, A and B are intermediate variables.
Beneficial effect：A kind of permanent-magnetic synchronous motor stator winding failure diagnostic method that the present invention is provided, can overcome existing
There is the deficiency of the diagnosis unbalance fault method of stator winding resistance.The present invention can not only diagnose the unbalance event of stator winding resistance
Barrier, and can also tracing trouble phase and estimation fault degree；The present invention calculates simple, it is easy to accomplish, the degree of accuracy is high.
Brief description of the drawings
Fig. 1 is the permagnetic synchronous motor control block diagram with three-phase equilibrium resistor network.
Fig. 2 is a kind of block diagram of permanent-magnetic synchronous motor stator winding failure diagnostic method.
Embodiment
The present invention is further described with reference to the accompanying drawings and detailed description.
As shown in Fig. 2 a kind of permanent-magnetic synchronous motor stator winding failure diagnostic method, comprises the following steps：
(1) residual voltage and stator current of PMSM Drive System are gathered, and calculates residual voltage and stator
The amplitude and starting phase angle of fundamental wave in electric current；
(2) amplitude and starting phase angle of fundamental wave in residual voltage and stator current are updated on phase resistance deviation
In binary quadratic equation group；
(3) the binary quadratic equation group is solved, and using phase difference and the relation of phase resistance deviation, determines the dihydric phenol
The suitable solution of equation, is the resistance deviation per phase winding；
(4) realize that fault detect, faulty phase locating and fault degree are estimated using the resistance deviation of every phase winding of calculating.
This case is illustrated below：
The voltage equation of permanent-magnetic synchronous motor stator winding is expressed as under abc coordinate systems
In formula：ua, ubAnd ucFor threephase stator voltage, u0It is residual voltage, ia, ibAnd icFor threephase stator electric current, L is fixed
Sub- winding self-induction, M is stator winding mutual inductance.Ra, RbAnd RcFor threephase stator resistance, when permagnetic synchronous motor is health, Ra, Rb
And RcIt is equal；When the unbalance failure of stator winding resistance occurs, Ra, RbAnd RcIt is no longer equal.λPM,a, λPM,bAnd λPM,cIt is
The permanent magnet flux linkage of threephase stator winding, it is expressed as
In formula：λPM,1It is the amplitude of fundamental wave magnetic linkage, v is overtone order, λPM,vIt is the amplitude of v subharmonic magnetic linkages, θ is rotor
Electrical angle, θvIt is the angle between v subharmonic magnetic linkage and fundamental wave magnetic linkage.
Residual voltage V in Fig. 10,mIt is expressed as
In formula：
Two parts composition will have been regarded as per phase stator resistance, be represented by
In formula：Rm=(Ra+Rb+Rc)/3, therefore following condition must is fulfilled for
ΔRa+ΔRb+ΔRc=0 (6)
In formula：ΔRa、ΔRbWith Δ RcIt is due to the unbalance failure of stator winding resistance in a phases, b phases and c phase stator winding
Caused resistance deviation.
And
ia+ib+ic=0 (7)
Therefore, residual voltage V0,mIt can be expressed as again
Ignore the harmonic wave in stator current, threephase stator winding current can be expressed as
In formula：IxAnd θx(x=a, b, c) is stator current i respectivelyxAmplitude and starting phase angle.
Formula (9) is substituted into formula (8) to obtain
V in formula1It is residual voltage V with α0,mThe amplitude and starting phase angle of middle fundamental wave, and be expressed as
In formula：V1It is the amplitude and starting phase angle of fundamental wave in residual voltage, I with αaAnd θaIt is stator current iaIn width
Value and starting phase angle, IbAnd θβIt is i in stator currentbIn amplitude and starting phase angle, Δ RaWith Δ RbIt is that a phases are fixed with b phases
The resistance deviation of sub- winding.Wherein, A and B are intermediate variables.
From formula (11) it can be seen that V1There is direct relation with α and stator current and resistance deviation.Due to residual voltage V0,m
It can directly calculate and obtain with the amplitude and starting phase angle of fundamental wave in stator current, therefore, substitute them in formula (11),
Just establish on resistance deviation Δ RaWith Δ RbBinary quadratic equation group, by solve equation group with regard to can obtain it is every around
The resistance deviation of group.In addition, it is necessary to which it is to be noted that binary quadratic equation group probably has multigroup real solution and multigroup complex roots.
In the present invention, real solution, and it needs to be determined that one group of suitable real solution are only considered.In order to solve this problem, phase is defined
Potential difference dx(x=a, b, c) is as follows：
Table 1 gives the relation between phase resistance deviation and phase difference.
Table 1
Therefore, the suitable real solution of binary quadratic equation group can be determined using table 1, is the resistance deviation per phase winding
ΔRa、ΔRbWith Δ Rc.Analyze for convenience, resistance deviation, which is for further processing, is
δRj=Δ Rj-min([ΔRa,ΔRb,ΔRc]) j=a, b, c (13)
Therefore, resistance deviation δ R are utilizeda、δRbWith δ RcWith regard to can complete stator winding resistance imbalance fault diagnosis, positioning and
Fault degree is estimated.Detailed process is as follows：As phase resistance deviation δ RaDuring more than 0, showing a phases of permagnetic synchronous motor has resistance
Property unbalance failure occur；As phase resistance deviation δ RbDuring more than 0, showing the b phases of permagnetic synchronous motor has the unbalance failure hair of resistive
It is raw；As phase resistance deviation δ RcDuring more than 0, the c phases that showing permagnetic synchronous motor has have the unbalance failure of resistive.In addition,
In the case of failure, resistance deviation δ R are utilizeda、δRbOr δ RcDetermine fault degree.When phase resistance deviation is not more than 0, show permanent magnetism
Synchronous motor is in normal operating condition.
Using method proposed by the present invention, the unbalance failure of permanent magnet synchronous electric loom winding resistance can not only be diagnosed, and
And can interpolate that failure phase and fault degree.Method amount of calculation proposed by the present invention is small, be easily achieved, the degree of accuracy is high, it is a kind of to be
The method for diagnosing faults of permagnetic synchronous motor security and reliability can be effectively improved.
It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention,
Some improvements and modifications can also be made, these improvements and modifications also should be regarded as protection scope of the present invention.In the present embodiment not
Clear and definite each part can use prior art to be realized.
Claims (2)
1. a kind of permanent-magnetic synchronous motor stator winding failure diagnostic method, it is characterised in that：Steps of the method are：
(1) residual voltage and stator current of PMSM Drive System are gathered, and calculates residual voltage and stator current
The amplitude and starting phase angle of middle fundamental wave；
(2) amplitude and starting phase angle of fundamental wave in residual voltage and stator current are updated to the binary on phase resistance deviation
In quadratic equation group；
(3) the binary quadratic equation group is solved, and using phase difference and the relation of phase resistance deviation, determines the binary quadratic equation
Suitable solution, be per phase winding resistance deviation；
(4) realize that fault detect, faulty phase locating and fault degree are estimated using the resistance deviation of every phase winding of calculating.
2. a kind of permanent-magnetic synchronous motor stator winding failure diagnostic method according to claim 1, it is characterised in that：It is described
Binary quadratic equation group in step (2) on phase resistance deviation is：
In formula：V1It is the amplitude and starting phase angle of fundamental wave in residual voltage, I with αaAnd θaIt is stator current iaIn amplitude and just
Beginning phase angle, IbAnd θβIt is i in stator currentbIn amplitude and starting phase angle, Δ RaWith Δ RbIt is a phases and b phase stator winding
Resistance deviation；Wherein, A and B are intermediate variables.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108490304A (en) * | 2018-03-22 | 2018-09-04 | 华能集团技术创新中心有限公司 | Generator stator winding single-phase earthing abort situation localization method |
| CN108872854A (en) * | 2018-06-26 | 2018-11-23 | 金龙联合汽车工业（苏州）有限公司 | A kind of method for diagnosing faults of new-energy automobile driving motor three-phase cable |
| CN112782578A (en) * | 2021-02-03 | 2021-05-11 | 安徽大学绿色产业创新研究院 | Asymmetric fault diagnosis method for stator winding of permanent magnet synchronous motor |
| 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 |
| CN113848477A (en) * | 2021-10-19 | 2021-12-28 | 南京理工大学 | Multi-phase permanent magnet synchronous motor turn-to-turn short circuit fault diagnosis method |
| CN114421824A (en) * | 2022-01-19 | 2022-04-29 | 安徽大学 | Brushless direct current motor position sensorless control method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108490304A (en) * | 2018-03-22 | 2018-09-04 | 华能集团技术创新中心有限公司 | Generator stator winding single-phase earthing abort situation localization method |
| CN108872854A (en) * | 2018-06-26 | 2018-11-23 | 金龙联合汽车工业（苏州）有限公司 | A kind of method for diagnosing faults of new-energy automobile driving motor three-phase cable |
| CN112782578A (en) * | 2021-02-03 | 2021-05-11 | 安徽大学绿色产业创新研究院 | Asymmetric fault diagnosis method for stator winding of permanent magnet synchronous motor |
| CN112782578B (en) * | 2021-02-03 | 2024-05-24 | 安徽大学绿色产业创新研究院 | Permanent magnet synchronous motor stator winding asymmetric fault diagnosis method |
| 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 |
| CN113848477A (en) * | 2021-10-19 | 2021-12-28 | 南京理工大学 | Multi-phase permanent magnet synchronous motor turn-to-turn short circuit fault diagnosis method |
| CN114421824A (en) * | 2022-01-19 | 2022-04-29 | 安徽大学 | Brushless direct current motor position sensorless control method |
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