直线永磁磁通切换电机推力脉动抑制方法分析  

Thrust ripple suppression methods for the flux-switchingpermanent magnetic machine

作　　者：郝雯娟 王宇[2] HAO Wenjuan;WANG Yu(Department of Electrical Engineering and Automation,Jincheng College,Nanjing University of Aeronautics and Astronautics,Nanjing 211156,China;College of Automation Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China)

机构地区：[1]南京航空航天大学金城学院机电工程与自动化学院,江苏南京211156 [2]南京航空航天大学自动化学院,江苏南京211106

出　　处：《电力工程技术》2022年第2期186-192,共7页Electric Power Engineering Technology

基　　金：国家自然科学基金资助项目(51977107)。

摘　　要：直线永磁磁通切换(LFSPM)电机功率密度高,转子结构简单可靠,在长行程直线牵引场合具有很大的应用潜力。然而,很多应用场合要求直线电机在具有高推力密度的同时也要能够呈现较低的推力脉动,因此研究推力脉动的产生机理以及抑制方法是提升LFSPM电机应用潜力的重要手段。通过有限元分析(FEA),先利用不同结构的辅助齿对LFSPM电机的端部效应进行改善,减小端部力;在此基础上,对抑制不同成因推力脉动的方法以及这些方法的组合效果进行仿真比较;比较过程中,提出一种的步进(错齿)位移选择方法;基于该方法,各结构在减小推力脉动的同时可以有效兼顾电机的输出推力平均值。FEA验证了所提出方法的通用性,可使不同结构的LFSPM电机在减小推力脉动的同时兼顾输出推力平均值。Linear flux-switching permanent magnet(LFSPM)machines have high power density and simple robust stator structure,which shows significant potential in long stroke applications.However,linear motors are required to have high thrust density and low thrust ripple in many applications.Therefore,the research on the issues causing the thrust force ripple and corresponding suppression methods are important means to enhance the application potential of the LFSPM machines.Through the finite element analysis(FEA)method,the end effect of LFSPM machine is improved by using different structures of the additional teeth,and the end force is reduced.Based on this,different thrust ripple reduction methods are employed and compared to suppress different thrust ripple components of the LFSPM machine.In the process of comparison,a step(staggered tooth)displacement selection method is given.It shows that each structure can reduce the thrust force ripple while taking into account the average output thrust force.FEA verifies the universality of the proposed method,and it can be used in LFSPM machines with different structures to reduce the thrust force ripple while taking into account the average output thrust.

关 键 词：直线电机 永磁磁通切换电机 推力脉动 定位力 端部效应 推力密度 

分 类 号：TM352[电气工程—电机]