磁极错位削弱永磁直线伺服电动机齿槽法向力波动方法  

The Magnet-Staggered Method to Weaken the Cogging Effect Normal Force Ripple of Permanent Magnet Linear Servo Motor

作　　者：夏加宽[1] 沈丽[1] 彭兵[1] 宋德贤[1] 

机构地区：[1]沈阳工业大学电气工程学院,沈阳110870

出　　处：《电工技术学报》2015年第24期11-16,37,共7页Transactions of China Electrotechnical Society

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

摘　　要：单边平板式永磁直线伺服电动机(PMLSM)在运行过程中动、定子之间存在较大的法向力波动,法向力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伺服电动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无端部效应的PMLSM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,得出齿槽效应产生的法向力波动的主要谐波次数,提出永磁磁极三段错位法以削弱其引起的主要谐波法向力波动,消除传统的斜极、移相优化方法产生的电动机横向俯仰运动。最后以齿槽法向力波动较为明显的12槽8极PMLSM为例,采用有限元仿真和实验验证,结果证明该方法不仅能够削弱齿槽效应产生的法向力波动,还能在推力基本保持不变的情况下,有效地削弱推力波动。There is the large normal force ripple between the mover and stator when the single-side flat-plate permanent magnet linear servo motor（PMLM） 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 tool greatly. The cogging effect of PMLM 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 which is derived with the Maxwell tensor method, which reveals the law of the normal force fluctuation caused by cogging effect. The primary harmonic of normal force caused by cogging effect is obtained by Fourier decomposition method, and the three sections of magnets staggered method to weaken the normal force ripple is presented to remove the lateral movement of the motor in traditional skewed pole and phase shift optimization methods. In the end, take 12 slots 8 poles PMLSM with obvious cogging normal force ripple for example, the finite element simulation and experiment methods are employed in this paper, and the results show that the method can reduce the cogging effect effectively without changing the thrust of PMLSM.

关 键 词：永磁直线伺服电动机 齿槽效应 法向力波动 磁极三段错位法 

分 类 号：TM351[电气工程—电机]