基于V型三段磁极错位削弱永磁直线电机推力波动的方法  

Method for Weakening Thrust Fluctuation of Permanent Magnet Linear Motor Based on V-Shaped Three-Stage Magnetic Pole Misalignment

作　　者：兰志勇[1] 谢斌 祝涤非 金维宇 Lan Zhiyong;Xie Bin;Zhu Difei;Jin Weiyu(College of Information Engineering Xiang Tan University Xiangtan,411105,China;Shanghai Ceyong Automation Technology Co.Ltd Shanghai,200120,China;Weisheng Electric Co.Ltd Xiangtan,411105,China)

机构地区：[1]湘潭大学信息工程学院,湘潭411105 [2]上海策永自动化科技有限公司,上海200120 [3]威胜电气有限公司,湘潭411105

出　　处：《电工技术学报》2021年第16期3474-3482,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51507148);风力发电机组及控制湖南省重点实验室开放研究基金(2016FLFDYB02)资助项目。

摘　　要：6槽7极单边平板型永磁同步直线电机(PMLSM)运行过程中会产生推力波动,导致机床加工精度变差。针对此问题,提出一种将磁极错位与V型磁极相结合的优化方法来改善其性能。首先采用许克变换法对端部磁场进行分析,得到由端部效应引起的总推力波动解析表达式,再对解析式中傅里叶系数进行分析,得出端部效应引起推力波动的主要谐波次数;然后通过对多种永磁体结构进行有限元仿真,由力特性得出采用V型三段错位磁极的方法,当两端磁极与中间磁极所产生的谐波相位互差90°时可有效削弱推力波动;最后根据此方法制作样机。有限元结果及样机实验验证了此方法的可行性,对单边平板型PMLSM优化设计有着重要的指导意义。The 6-slot,7-pole single-sided flat-plate permanent magnet synchronous linear motor(PMLSM)generates thrust fluctuations during operation,resulting in poor machining accuracy.This paper proposes an optimization method combining magnetic pole misalignment and V-shaped magnetic poles to improve its performance.Firstly,the end magnetic field is analyzed by the Huck transform method to obtain the analytical expression of the total thrust fluctuation caused by the end effect.Then the Fourier coefficients in the analytical formula are analyzed,and the main harmonic order of thrust fluctuation caused by the end effect is obtained.Through the finite element simulation of a variety of permanent magnet structures,the method of V-shaped three segment dislocation pole is obtained from the force characteristics.When the phase difference between the two poles and the middle pole is 90 degrees,the thrust fluctuation can be effectively reduced.Finally,a prototype was made based on this method.The finite element results and prototype experiments verify the feasibility of this method,which provides a guidance for the optimal design of single-sided flat PMLSM.

关 键 词：V型三段磁极错位 许克变换法 磁阻力 端部推力波动 永磁同步直线电机 有限元仿真 

分 类 号：TM351-359.4[电气工程—电机]