齿槽效应对永磁直线伺服电机法向力波动的影响  

Influences of Cogging Effects on Normal Force Ripple in Permanent Magnet Linear Servo Motors

作　　者：夏加宽[1] 沈丽[1] 彭兵[1] 孙宜标[1] 

机构地区：[1]沈阳工业大学电气工程学院,辽宁省沈阳市110870

出　　处：《中国电机工程学报》2015年第11期2847-2853,共7页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51377108);辽宁省高等学校创新团队项目(LT2013006);国家科技重大专项子课题(2012ZX04001-011-003)~~

摘　　要：单边平板型永磁直线伺服电机在运行过程中动、定子之间存在较大的法向力,法向力的波动引起的摩擦力摄动和机床振动极大地影响了机床的加工精度。齿槽效应是引起永磁直线电机法向力波动的一个重要原因。为此,采用麦克斯韦张量法推导了动子边齿无限长永磁直线电机法向电磁力的解析表达式,揭示齿槽效应引起的法向力波动的规律。通过对傅里叶分解系数的分析,指出齿顶宽度和极弧系数是影响法向力波动的两个最为主要的电机参数。利用Ansoft有限元软件仿真分析了电机在不同极弧系数和齿顶宽度下的法向力波动规律。结果表明,优化极弧系数和齿顶宽度能较好地削弱齿槽效应带来的法向力波动幅值,仿真和实验结果与解析结果基本一致,验证了法向力波动解析分析方法的正确性。There is the large normal force ripple between the mover and the stator when the single-side flat-plate permanent magnet linear servo motor （PMLSM） is operating, and the friction force perturbation and the vibration of the machine tool caused by the normal force ripple will influence the accuracy of machine tools greatly. The cogging effect of PMLSM is one of the important factors that cause the normal force ripple. Therefore, the normal force analytic expression of the infinitely long side tooth PMLSM is derived using the Maxwell tensor method, which reveals the law of the normal force ripple caused by cogging effects. It can be known by analyzing the Fourier decomposition coefficients that the tooth tip width and the pole arc coefficient are the two main parameters impacting the normal force ripple. Using the Ansoft finite element software, the law of the normal force ripple is analyzed under different tooth tip widths and pole arc coefficients. The simulation results demonstrate that the normal force ripple amplitude caused by the cogging can be effectively weakened by optimizing the tooth tip width and the pole arc coefficient. Simulation and analytical results are basically consistent, which demonstrates the validity of the analytical method for the normal force ripple.

关 键 词：法向力波动 齿槽效应 永磁直线电机 麦克斯韦 张量法 解析法 

分 类 号：TM351[电气工程—电机]