无槽环形绕组轴向磁通永磁电机空载反电动势解析

Analysis of Open Circuit Back Electromotive Force in Slotless Toroidal Type Winding Axial Flux Permanent Magnet Machine

无槽环形绕组有两种类型,即扇形绕组和矩形绕组。针对这两种绕组空间分布对空载反电动势的影响,分别对两种绕组轴向磁通永磁电机的空载反电动势进行了解析推导。在气隙磁密解析计算时,提出通过建立虚拟等效直线电机模型用以计算气隙磁场端部效应函数。为了验证解析公式的正确性,以一台电机方案为例,利用推导的解析公式对空载反电动势进行了计算,与有限元计算结果进行了对比,结果表明解析计算结果和有限元计算结果相对误差小于2.1%,满足工程要求。因此,推导的空载反电动势解析公式可以作为电机设计人员参考使用。

There are two types of winding in slotless toroidal type winding axial flux permanent magnet machines,one is fan-shaped winding,another is rectangle winding. Considering the effect of winding spatial distribution on open circuit back EMF in slotless axial flux permanent magnet machine,the corresponding analytical formulas of back EMF were derived. In order to calculate the end effect function of air gap magnetic field during calculating air gap magnetic field by analytical method,a virtual equivalent linear machine model was built. For verifying the correctness of the analytical formulas,a comparison of back EMF by analytical and FE methods based on a motor design scheme was carried out,the computing results showed that relative error between them was less than 2. 1%,the result met the need of engineering. So,the analytical formulas of back EMF could be used as reference for the researchers who designed AFPM machine.