永磁电机零阶径向力引起的齿槽频次振动.pdf

齿槽阶次振动


第 41 卷 中 国 电 机 工 程 学 报 Vol.41 2021
2021 年 Proceedings of the CSEE ©2021 Chin.Soc.for Elec.Eng. 1
DOI:10.13334/j.0258-8013.pcsee.201732 文章编号:0258-8013 (2021) 00-0000-00 中图分类号:TM 351 文献标志码:A
永磁电机零阶径向力引起的齿槽频次振动
吕长朋 1,李明勇 2,陈辉 1
(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)
Cogging Frequency Vibration of Permanent Magnet Motor Caused
By Zeroth-order Radial Magnetic Forces
LÜ Changpeng
1
, LI Mingyong
2
, CHEN Hui
1
(1. School of Energy and Power, Wuhan University of Technology, Wuhan 430063, Hubei Province, China; 2. Science and
Technology on Ship Integrated Power System Technology Laboratory, Wuhan 430064, Hubei Province, China)
ABSTRACT: 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), 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.
KEY WORDS: skewed slot; permanent magnet motor; zeroth-
order radial magnetic forces; 2D FFT; cogging frequency
基 金 项 目 : 船 舶 综 合 电 力 技 术 重 点 实 验 室 基 金 项 目
(614221720190201)。
Project Supported by Foundation of Science and Technology on Ship
Integrated Power System Technology Laboratory(614221720190201).
vibration
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。
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
0 引言
由于结构简单可靠、转矩密度高和效率高等优
势,低速高转矩永磁电机在船舶推

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