Demagnetization, winding open circuit and turn-to-turn short circuit fault classification method of permanent magnet synchronous motor

Abstract

The invention discloses a demagnetization, winding open circuit and turn-to-turn short circuit fault classification method of a permanent magnet synchronous motor in the field of motor fault diagnosis. The method comprises the following steps: collecting a position angle and a three-phase current during the actual operation of the permanent magnet synchronous motor, and calculating an included angle between a current synthesis vector and a straight axis during the actual operation of the permanent magnet synchronous motor under a dq coordinate system according to the position angle and the three-phase current; calculating the current unbalance degree of each phase according to the current maximum value and the current minimum value of each phase in an acquisition period, and judging motor normality, open circuit faults, turn-to-turn short circuit faults or demagnetization faults according to two experience boundary values of the current unbalance degree; and comparing the included angle between the current synthesis vector in actual operation and the straight axis with the included angle between the current synthesis vector in normal operation and the straight axis to judge a turn-to-turn short circuit fault and a demagnetization fault. The function of distinguishing multiple faults at the same time is realized.

Description

technical field [0001] The invention belongs to the field of motor fault diagnosis, in particular to the fault diagnosis of an embedded permanent magnet synchronous motor (IPMSM), aiming at different types of faults of the IPMSM, realizing three different faults of winding open circuit, permanent magnet demagnetization and winding turn-to-turn short circuit. Classification diagnosis. Background technique [0002] With the gradual improvement of the performance of permanent magnet materials, the cost is greatly reduced. Permanent magnet synchronous motors have entered a period of rapid development. Different from the traditional synchronous motor, the permanent magnet synchronous motor directly generates a magnetic field through the internal permanent magnet, which not only reduces the loss of the internal rotor of the motor, but also improves the energy conversion efficiency. Permanent magnet synchronous motors have a higher power-to-volume ratio, higher power density, and...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems existing in the existing permanent magnet synchronous motor fault diagnosis technology, and propose a permanent magnet synchronous motor demagnetization, winding open circuit and inter-turn short circuit fault classification method, using the current imbalance and the current in the dq coordinate system The angle between the synthetic vector and the direct axis is used as the fault characteristic value to identify demagnetization, winding open circuit and inter-turn short circuit faults in detail

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