永磁电机零阶径向力引起的齿槽频次振动  

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

作　　者：吕长朋 李明勇 陈辉[1] LYU Changpeng;LI Mingyong;CHEN Hui(School of Energy and Power,Wuhan University of Technology,Wuhan 430063,Hubei Province,China;Science and Technology on Ship Integrated Power System Technology Laboratory,Wuhan 430064,Hubei Province,China)

机构地区：[1]武汉理工大学(能源与动力工程学院),湖北省武汉市430063 [2]船舶综合电力技术重点实验室,湖北省武汉市430064

出　　处：《中国电机工程学报》2021年第19期6778-6786,共9页Proceedings of the CSEE

基　　金：船舶综合电力技术重点实验室基金项目(614221720190201)。

摘　　要：理论上采用斜槽可将齿槽转矩幅值削弱为零,但斜槽不能有效削弱力波次数为零的齿槽频次径向力。该文针对一台40极240槽的斜槽永磁电机的研究结果表明,零阶径向力产生的齿槽频次振动大于力波次数为极数40的2倍频径向振动,为电机空载时幅值最大振源。文中首先用解析法阐述了零阶径向电磁力产生机理,然后利用电磁场软件计算样机的空载气隙磁密和径向电磁力密度,并对二者分别进行二维傅里叶分析(2D-FFT),求取出不同阶次下(空间)对应频率(时间)的磁密和径向电磁力密度结果,利用气隙磁密结果分析出引起齿槽振动的主要谐波磁场,利用径向电磁力密度结果计算出由径向电磁力引起的定子振动水平,结果表明,零阶径向电磁力引起的空载齿槽频次振动为电机的主振频率,远大于非零最小阶次引起的2倍频径向振动,最后,样机试验结果验证了理论分析的正确性。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.

关 键 词：斜槽 永磁电机 零阶径向力 二维傅里叶分析 齿槽频次振动 

分 类 号：TM351[电气工程—电机]