Permanent magnet synchronous motor field failure diagnosis method based on residual voltage after ac dump

A permanent magnet synchronous motor and fault diagnosis technology, which is applied in the direction of motor generator testing, etc., can solve the problems of decreased diagnostic sensitivity, diagnosis of demagnetization faults, and difficulty in intuitively seeing the frequency components without faults, etc., to achieve simple and convenient operation, Effect of High Reliability Loss of Excitation Fault

Inactive Publication Date: 2013-12-18
HOHAI UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, using the stator current to diagnose the motor rotor loss of excitation fault, whether it is a steady-state analysis or a transient analysis, still has certain limitations:
[0004] (1) Other types of faults of the rotor will also generate the same harmonics as above, such as dynamic eccentricity, which makes it difficult to distinguish loss of field faults from other types of faults
In addition, the output voltage of the inverter as a driving power supply is non-sinusoidal and contains a large number of time harmonics, resulting in a large number of harmonic components in the current, which brings difficulties to the use of current harmonics to diagnose demagnetization faults
[0005] (2) When the rotor has a slight demagnetization fault, the ratio of the fault frequency component to the fundamental frequency component in the stator current is very small, and the ratio is even smaller when the motor is running at light load, which brings difficulties to signal processing and makes Decreased diagnostic sensitivity
This makes it difficult to visually see whether there is a fault frequency component on the spectrogram

Method used

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  • Permanent magnet synchronous motor field failure diagnosis method based on residual voltage after ac dump
  • Permanent magnet synchronous motor field failure diagnosis method based on residual voltage after ac dump
  • Permanent magnet synchronous motor field failure diagnosis method based on residual voltage after ac dump

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Embodiment Construction

[0033] Embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0034] A method for diagnosing a permanent magnet synchronous motor loss of field fault based on a power loss residual voltage, comprising the following steps:

[0035] Step (1) Use the voltage sensor to collect the instantaneous voltage signal u of any phase at the stator end of the motor with a speed of n at the moment of de-energization s ;

[0036] Step (2) from the collected stator terminal voltage instantaneous signal u s Intercept the power-off residual voltage waveform from the power-off moment, observe whether the power-off residual voltage waveform is distorted, and perform spectrum analysis to compare whether the harmonic components change, that is, to preliminarily judge the level of the possibility of de-excitation failure;

[0037] Step (3) Perform spectrum transformation on the intercepted power-off residual voltage waveform to determine the amp...

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Abstract

The invention discloses a permanent magnet synchronous motor field failure diagnosis method based on residual voltage after ac dump and belongs to the field of electric automobile motor failure diagnosis. The method includes the steps of collecting a voltage momentary signal of any phase of a stator end at the alternating current dumping moment, capturing the waveform of the residual voltage after ac dump since the alternating current dumping moment from the voltage momentary signal, initially judging the probability of the field failure, conducting frequency spectrum conversion on the captured residual voltage after ac dump, determining a fundamental component amplitude, determining the ratio of the fundamental component amplitude to the motor speed as a failure feature, setting a failure pre-warning threshold value, determining the ratio of the failure feature to the failure pre-warning threshold value as a failure factor, and judging whether the field failure exists or not according to the failure factor. The method is not influenced by the converter supply, a permanent magnet synchronous motor is detected without being influenced by the load, the defect that the traditional diagnosis is conducted through the stator current is effectively overcome, and the field failure of the electric automobile permanent magnet synchronous motor can be quite flexibly and quite reliably diagnosed.

Description

technical field [0001] The invention relates to a method capable of diagnosing the demagnetization fault of a permanent magnet synchronous motor of an electric vehicle, and belongs to the field of fault diagnosis of a drive motor of an electric vehicle. Background technique [0002] Due to its compact structure, small size, light weight, high efficiency, high torque, high power density, reliable operation, low noise and other performance characteristics, the permanent magnet synchronous motor has the best comprehensive index for electric vehicle drive, and is very suitable for electric vehicles drive field. However, the operating environment of electric vehicle drive motors is harsh and the operating conditions are complex. The rotor permanent magnets will demagnetize under electrical, magnetic, thermal, mechanical and other stresses. Once the permanent magnets have irreversible demagnetization failures, it will lead to performance indicators of permanent magnet motors. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34
Inventor 马宏忠钟钦张志艳赵宏飞朱跃光徐刚陈涛涛
Owner HOHAI UNIV
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