分段式永磁直线同步电机磁阻力分析及优化设计

Detent Force Analysis and Optimization Design of Permanent Magnet Linear Synchronous Motor

磁阻力是引起永磁直线同步电机(PMLSM)推力波动的主要原因,降低了电机的推力特性。文章分析了12槽11极PMLSM磁阻力形成机理及周期性分布规律,并采用有限元法论证了一种能消除推力波动的分段式初级铁芯的方法。分析结果表明,具有三个铁芯模块组合初级的直线电机能有效减小磁阻力。最后对分段式PMLSM磁阻力进行综合分析,为PMLSM本体设计和伺服系统设计提供参考。

The detent force is composed of cogging force and end effect force in permanent magnet linear synchronous motor（ PMLSM） . The detent force is a major factor of thrust ripple of PMLSM,which deteri-orates the motion control characteristics. This paper analyzed the forming principle and periodic distribution of 12-slot 11-pole PMLSM ’ s cogging force and demonstrates a kind of segmented core primary method which can eliminate static thrust fluctuation with finite element method （ FEM ） . Analysis results show that linear motor with three core module combination primary can effectively reduce detent force. Comprehensive analysis of the segmented core primary method was adopted to provide references for design of PMLSM ser-vo system.