Method for improving early turn-to-turn short circuit fault diagnosis reliability of permanent magnet synchronous motor

Abstract

The invention discloses a permanent magnet synchronous motor early turn-to-turn short circuit fault diagnosis reliability improving method. The method is specifically implemented according to the following steps: step 1, establishing a mathematical model of a permanent magnet synchronous motor turn-to-turn short circuit fault; 2, designing a voltage disturbance observer for compensating power supply imbalance caused by an inverter according to the mathematical model of the turn-to-turn short circuit fault of the permanent magnet synchronous motor; and step 3, after compensation, extracting high-frequency current response under high-frequency signal injection of the permanent magnet synchronous motor through a band-pass filter, and then performing coordinate transformation and extracting fault features through a low-pass filter. The method solves the problem that the fault feature is not obvious in the early stage of the turn-to-turn short circuit fault and the fault cannot be accurately detected.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis of permanent magnet synchronous motors, and in particular relates to a method for improving the reliability of early inter-turn short-circuit fault diagnosis of permanent magnet synchronous motors. Background technique [0002] Permanent Magnet Synchronous Motor (PMSM) has many advantages such as high power density, high efficiency, high torque density, etc., and has been widely used in industrial production, daily life and other occasions. Due to the small working environment, high temperature, high humidity, poor heat dissipation conditions, as well as mechanical, electrical and other factors, various faults are prone to occur during the working process of the permanent magnet synchronous motor. Among them, the inter-turn short-circuit fault is the most common fault, which is destructive and easy to cause other faults. After the turn-to-turn short-circuit fault occurs, if the fault cann...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for improving the reliability of early-stage inter-turn short-circuit fault diagnosis of permanent magnet synchronous motors, which solves the problem that the early-stage inter-turn short-circuit fault has no obvious fault features and cannot accurately detect the fault

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