永磁同步电机失磁故障电磁仿真分析

doi:10.16180/j.cnki.issn1007-7820.2021.10.005

Abstract

Abstract:

In view of the problem of permanent magnet loss of permanent magnet synchronous motor, the method of finite element analysis is used in the proposed study to establish Ansoft Maxwell finite element analysis model of 3 kW small permanent magnet synchronous motor. The method of reducing the coercive force and residual magnetic induction of permanent magnet materials is adopted to simulate the permanent magnet demagnetization failure, and the finite element models of the motor under different degrees of loss of magnetism are established. The results show that when the permanent magnet synchronous motor has a 50% loss of field fault, the air gap magnetic density decreases in varying degrees at no-load and load, the no-load air gap magnetic field attenuates by 53.0% and the load decays by 19.8%. Additionally, the induced potential decreases linearly, the current nonlinearity increases, and the fundamental and harmonic components of the induced potential decrease in varying degrees. The motor output torque decreases with the increase of the loss of field, and when the degree of loss of excitation reaches 50%, the permanent magnet motor cannot reach the rated torque output state. This result can be used as an important basis for the diagnosis of loss of excitation fault.

Key words: permanent magnet synchronous motor, Ansoft Maxwell, demagnetization, output torque, air gap magnetic density, fault diagnosis, finite element, coercive force

CLC Number:

TP391.9

CHEN Shengli,WANG Xinzhang,XU Xiaozhuo. Electromagnetic Simulation Analysis of Permanent Magnet Synchronous Motor Demagnetization Fault[J].Electronic Science and Technology, 2021, 34(10): 32-37.

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主要参数	参考值
额定功率	3 kW
极对数	3
定子外径	210 mm
定、转子铁心	DW315_50
轴向长度	65 mm
气隙厚度	1 mm
轴向长度	65 mm

失磁比	基波/V	3次谐波/V	5次谐波/V	7次谐波/V
0%	277.2	17.2	6.8	7.6
10%	258.4	17.1	6.3	6.9
20%	236.1	16.4	5.5	6.0
30%	209.6	15.3	4.7	5.2
40%	180.5	13.5	3.9	4.4
50%	150.5	11.3	3.3	3.7
60%	120.4	9.0	2.6	2.9
70%	90.3	6.8	1.9	2.2

失磁比例	平均铜耗	铁耗	总损耗
0%	257 W	26.4 W	283.4 W
80%	410 W	24.2 W	434.2 W
60%	870 W	22.4 W	892.4 W
40%	4 202 W	20.7 W	4 222.7 W

Electromagnetic Simulation Analysis of Permanent Magnet Synchronous Motor Demagnetization Fault

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