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Initial detection method, system and medium for inter-turn short-circuit fault of permanent magnet synchronous motor

A permanent magnet synchronous motor, inter-turn short-circuit fault technology, applied in short-circuit testing, motor-generator testing, electrical winding testing, etc., can solve the problem that the time domain and frequency domain resolution cannot be optimal at the same time, limited and so on

Active Publication Date: 2020-12-29
HUNAN UNIV
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Problems solved by technology

The linear time-frequency representation based on wavelet transform fundamentally avoids cross-term interference, but limited by the Heisenberg uncertainty principle, the time domain and frequency domain resolution cannot be optimal at the same time

Method used

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  • Initial detection method, system and medium for inter-turn short-circuit fault of permanent magnet synchronous motor
  • Initial detection method, system and medium for inter-turn short-circuit fault of permanent magnet synchronous motor
  • Initial detection method, system and medium for inter-turn short-circuit fault of permanent magnet synchronous motor

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Embodiment Construction

[0064] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0065] Since the turn-to-turn short circuit fault is caused by insulation damage between adjacent coils, the initial stage of the fault is the continuous deterioration of the insulation between the two turns of the coil. Therefore, different from the traditional diagnosis method for different short-circuit turns, the present invention proposes an initial fault detection method based on residual insulation capacity.

[0066] Among them, the inter-turn short circuit fault of permanent magnet synchronous motor will cause three-phase unbalance, resulting in zero-sequence component in the stator winding. The zero-sequence component is composed of harmonic components with the same phase, that is, the third harmonic of the phase voltage and its odd multiple harmonic components. The present invention uses this as a fault indication, and obtains fault ...

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Abstract

The invention discloses an initial detection method and system for a turn-to-turn short circuit fault of a permanent magnet synchronous motor, a medium and equipment, and belongs to the technical field of motor fault detection. The method comprises the steps: 1), obtaining a three-phase stator current signal and a rotor rotating speed signal of a permanent magnet synchronous motor; 2), calculatinga frequency band range where a fault characteristic harmonic component is located according to the permanent magnet synchronous motor rotor speed signal in the diagnosis period; 3), carrying out continuous wavelet transform processing on a stator winding three-phase current signal of the permanent magnet synchronous motor, setting a wavelet coefficient outside a frequency band range where the fault characteristic harmonic component is located in a transform result to be zero, and carrying out reconstruction to obtain a reconstruction result; 4), performing synchronous compression wavelet transform on a reconstruction result, reconstructing time-frequency distribution, and obtaining a time-frequency structure, and 5), performing fault detection based on the time-frequency structure. The method has the advantages of small calculation amount, high detection precision, wide application range and the like.

Description

technical field [0001] The present invention mainly relates to the technical field of motor control, in particular to an initial detection method, system, medium and equipment for an inter-turn short circuit fault of a permanent magnet synchronous motor. Background technique [0002] With the development of rail transit, new energy vehicles, wind power and other industries, permanent magnet synchronous motors have been used more and more widely due to their advantages of high efficiency, high power density and high torque density. It is of great significance to carry out research on fault detection methods of permanent magnet synchronous motors to improve the reliability of the drive system and reduce maintenance costs. Common electrical faults in permanent magnet synchronous motors include stator winding turn-to-turn short circuit, permanent magnet permanent demagnetization, winding open circuit, ground short circuit, etc. Among them, inter-turn short circuit fault accounts...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/34G01R31/52G01R31/72G01R23/16
CPCG01R23/16G01R31/34G01R31/52G01R31/72
Inventor 刘侃魏东丁荣军余康倪大成黄庆李云陈建明陈致初刘鹏飞
Owner HUNAN UNIV
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