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
CN111965543BActive Publication Date: 2020-12-29HUNAN UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
HUNAN UNIV
Publication Date
2020-12-29

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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.
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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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