Cogging Frequency Vibration of Permanent Magnet Motor Caused by Zeroth-order Radial Magnetic Forces

被引：0
|
作者：
Lyu C. [1 ]
Li M. [2 ]
Chen H. [1 ]
机构：
[1] School of Energy and Power, Wuhan University of Technology, Wuhan
[2] Science and Technology on Ship Integrated Power System Technology Laboratory, Wuhan
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2021年 / 41卷 / 19期
关键词：
2D FFT; Cogging frequency vibration; Permanent magnet motor; Skewed slot; Zeroth- order radial magnetic forces;
D O I：
10.13334/j.0258-8013.pcsee.201732
中图分类号：
学科分类号：
摘要：
Theoretically, the cogging torque amplitude can be reduced to zero by using the skewed slot, but the slot frequency radial force with zero force wave number can not be weakened by the skewed slot. In this paper, a 40 pole 240 slots skewed slot permanent magnet motor was studied. The results show that the cogging frequency vibration caused by the zero order radial force is greater than the 2-fold frequency radial vibration when the force wave number is 40, which is the maximum amplitude vibration source when the motor is no load. In this paper, firstly, the generation mechanism of zero order radial electromagnetic force was explained by analytical method. Then, the electromagnetic field software was used to calculate the no-load air gap flux density and radial electromagnetic force density of the prototype. Then, the two-dimensional Fourier analysis was carried out to obtain the magnetic density and radial electromagnetic force density results of the corresponding frequency (time) under different orders (space). Also, the vibration of the cogging was analyzed by using the results of air gap flux density, and the stator vibration level was calculated by using the radial electromagnetic force density result. The results show that the no-load cogging frequency caused by zero order radial electromagnetic force is the main vibration frequency of the motor, which is far greater than the radial vibration caused by the lowest non-zero orders. Finally, the prototype test results verified the correctness of the theoretical analysis. © 2021 Chin. Soc. for Elec. Eng.
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页码：6778 / 6786
页数：8
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