双V型结构削弱永磁直线电机磁阻力波动方法

A Method for Reducing Detent Force Fluctuation by Double-V-Shaped Structure in Permanent Magnet Linear Motor

磁阻力是单边平板型永磁直线电机(PMLM)推力波动的主要组成部分,影响了其在精密驱动领域的应用,为此,提出双V型结构削弱端部效应和齿槽效应产生的推力波动的方法。首先分析齿槽磁阻力和端部磁阻力的波动规律;然后基于积分法推导齿槽效应磁阻力与磁极的V型深度之间关系。接着针对特定深度的V型磁极,推导端部效应磁阻力与V型端部电枢铁心V型深度的关系。最后,以12槽10极PMLM为例,采用有限元仿真和实验验证,结果证明该方法能够有效削弱端部效应和齿槽效应产生的磁阻推力波动。

The detent force is a major component of the thrust fluctuation in unilateral plate type permanent magnet linear motor （PMLM）, affecting the application of PMLM in the field of precision driving. A double-V-shaped structure is put forward to weaken the thrust fluctuation caused by the end effect and the slot effect. First, this paper analyzes the fluctuation rules of the slot detent force and the end detent force. Next, the relationship between the slot detent force and the V-shape depth of the magnetic pole is derived based on the integral method. The relationship between the end detent force and V-shape depth is derived based on a special V-shape depth. Finally, taken a 12-slot 10-pole PMLM as an example, the finite element simulation and experimental results show that the method can effectively weaken the detent force fluctuation caused by the end and the slot effects.