扁平型永磁直线电机定位力综合优化

Optimization Design of a Permanent Magnet Linear Motor Using Finite Element and Taguchi Method

通过单一变量削弱永磁直线电机定位力的方法往往会影响到永磁直线电机的其他性能,所以需要以多变量、多目标进行综合优化设计。以一台18槽21极扁平永磁直线电机为优化对象,分析了影响定位力的关键参数。以边齿宽度、斜极长度、磁钢宽度和磁钢厚度为优化变量,以定位力、反电势和单块磁钢用量为优化目标,基于田口法和有限元法进行优化设计,通过对仿真结果的分析确定最佳的变量组合。有限元仿真结果表明,优化后的电机的定位力减小、反电势幅值增加并且磁钢用量减少,实现了优化目标。最后,通过测试样机的定位力和反电势验证了方法的有效性。

The method of weakening the detent force of permanent magnet linear motor by a single variable will often affect the other performance of the permanent magnet linear motor,so it is necessary to carry out comprehensive optimization design with multiple variables and objectives.Taking an 18 slot 21 pole permanent magnet linear motor as an optimization object,the key parameters affecting the detent force were analyzed.Taking edge tooth width,Oblique pole length,magnetic steel width and magnetic steel thickness as optimization variables,detent force,EMF and single magnetic steel consumption as optimization objectives,taguchi method and finite element method were adopted to optimize the design,and the optimal combination of variables was determined through the analysis of simulation results.The results of finite element simulation show that the optimized motor’s positioning force decreases,the EMF amplitude increases and the magnetic steel consumption decreases.Finally,the effectiveness of the method was verified by testing the detent force and EMF of the prototype.