表贴式永磁同步电机解析建模与极槽配合选取  

Analytical modeling and pole-slot combination of magnetic field in surface-mounted permanent-magnet synchronous motor

作　　者：杜刚[1] 邓兆祥[1] 张河山[2] 杨明磊 唐小丽 DU Gang;DENG Zhaoxiang;ZHANG Heshan;YANG Minglei;TANG Xiaoli(School of Automotive Engineering,Chongqing University,Chongqing 400044,P.R.China;College of Traffic&Transportation,Chongqing Jiaotong University,Chongqing 400074,P.R.China;School of Automotive Studies,Tongji University,Shanghai 201804,P.R.China;Dongfeng Xiaokang Automobile Co.,Ltd.,Chongqing 405321,P.R.China)

机构地区：[1]重庆大学汽车工程学院,重庆400044 [2]重庆交通大学交通运输学院,重庆400074 [3]同济大学汽车学院,上海201804 [4]东风小康汽车有限公司,重庆405321

出　　处：《重庆大学学报》2021年第7期1-13,共13页Journal of Chongqing University

基　　金：高性能一体化电驱动总成开发与产业化(cstc2018jszx-cyztzxX0004)。

摘　　要：合理选取极槽配合是电机设计的关键环节,为解决传统有限元技术重复建模带来的耗时和资源占用等问题,建立了永磁同步电机解析模型,来分析不同极槽配合对电机性能的影响。在二维极坐标系,将电机划分成永磁体、气隙、电枢槽和槽开口四类子域,并构建了各子域的拉普拉斯方程或泊松方程,利用分离变量法结合边界条件对各子域进行解析计算,完成电机解析模型的搭建。借助有限元结果验证了该解析模型的正确性,并采用该解析模型研究了不同极槽配合对电机性能的影响。通过对比发现,60槽8极电机的齿槽转矩远小于其他几种,转矩输出特性更好;分数槽配合的负载径向气隙磁密正弦性比整数槽更好,能有效地降低转矩脉动;在一定范围内,多槽结构有利于提升电机的转矩特性。Reasonable selection of pole-slot combination is a key part of electric machinery design.In order to solve the problems of time-consuming and resource-consuming caused by repeated modeling with traditional finite element technology,an analytical model of permanent magnet synchronous motor is established to analyze the influence of different pole-slot combinations on motor performance.In 2 D polar coordinate system,the motor is divided into four regions:armature slot,stator slot opening,air gap and permanent magnet.Then,the Laplace equation or Poisson equation of each sub-domain is constructed.The sub-domains are analytically calculated by combining the variable separation method with the boundary conditions,and the construction of the motor’s analytical model is completed accordingly.The correctness of the analytical model is verified by the finite element method.Using the analytical model,the effects of different pole-slot combinations on the performance of the motor are studied.The results show that the 60-slot-8-pole motor has better performance of output torque with much smaller cogging torque than the others.The load radial air gap flux density of fractional pole-slot combination is more sinusoidal than that of integer pole-slot combination,which can effectively reduce torque ripple.Within a certain range,multi-slot structure is beneficial to promoting the performance of motor’s output torque.

关 键 词：永磁同步电机 解析建模 极槽配合 电动汽车 电机设计 

分 类 号：TM341[电气工程—电机]