削弱永磁直线电机法向力波动优化设计

Optimization Design of Permanent Magnet Linear Motor to Weaken Normal Force Ripple

为了削弱永磁直线电机(PMLM)运动中存在于动子与定子之间的法向力波动,在推导分析法向力波动产生原理的基础上,采用最优极弧系数和磁极倒角法削弱齿槽法向力,采用优化铁心长度及端齿形状削弱端部法向力,以达到综合削弱PMLM法向力波动的目的。通过有限元仿真证明了所采用方法的有效性,可以在满足推力要求的的情况下,极大地削弱PMLM的法向力波动。所得结论可为永磁直线电机的设计提供一定的理论指导。

In order to weaken the normal force ripple existing between the mover and the stator in the movement of permanent magnet linear motor(PMLM), on the basis of deducing and analyzing the generation principle of normal force ripple, the optimal pole-arc coefficient and magnetic pole chamfer method are used to weaken the cogging normal force, and the optimization of core length and the end tooth shape are used to weaken the end normal force, so as to comprehensively weaken the normal force ripple of the PMLM. The effectiveness of the method is proved by finite element simulation, which can greatly weaken the normal force ripple of the motor when the thrust requirements are met. The obtained conclusions can provide some theoretical guidance for the design of permanent magnet linear motors.