不等宽不等厚Halbach部分分段永磁同步电机电磁性能解析计算与优化分析  

Analytical Calculation and Optimization Analysis of Electromagnetic Performance of Halbach Partially-Segmented Permanent Magnet Synchronous Motors with Unequal Width and Thickness

作　　者：高锋阳[1] 齐晓东 李晓峰 陶彩霞[1] 高鹏 Gao Fengyang;Qi Xiaodong;Li Xiaofeng;Tao Caixia;Gao Peng(College of Automation and Electrical Engineering Lanzhou Jiaotong University,Lanzhou 730070 China;College of Electrical Engineering and Information Tianjin University,Tianjin 300072 China)

机构地区：[1]兰州交通大学自动化与电气工程学院,兰州730070 [2]天津大学电气自动化与信息工程学院,天津300072

出　　处：《电工技术学报》2022年第6期1398-1414,共17页Transactions of China Electrotechnical Society

基　　金：国家重点研发计划(2018YFB1201602-06);天津大学和兰州交通大学联合基金(2020056)资助项目。

摘　　要：针对高功率密度的永磁同步电机电磁转矩波动和永磁体涡流损耗大的问题,提出一种Halbach部分分段结构,永磁体采用Halbach充磁方式,每极分为三段,主磁极采用单侧部分分段,边界磁极与主磁极不等厚且不等宽,并将其永磁体扩展为两种型式,即Hat型和T型。采用精确子域模型法,将求解域划分为槽身、槽口、气隙以及永磁体四个区域,在二维极坐标下计算电机负载气隙磁通密度分布和电磁转矩。建立10极12槽三维电机模型对Hat型、T型以及其他相关五种电机结构进行电磁仿真、分级优化以及对比分析,求出最优Hat型和T型结构。结果表明,Halbach部分分段结构可以降低永磁体涡流损耗、电磁转矩波动以及负载气隙磁通密度总谐波畸变率(THD),T型Halbach部分分段结构的电磁性能高于Hat型,而Hat型Halbach部分分段结构可以进一步减小永磁体体积,节约生产成本。同时,在有限元应力场中建立三维永磁同步电机求解模型,求得等效应力和总变形,确保Hat型和T型Halbach部分分段结构永磁体的机械强度都维持在允许范围内。In order to suppress the electromagnetic torque ripple and reduce the permanent magnet eddy current loss in high power-density permanent magnet synchronous motor,a partiallysegmented structure of Halbach is proposed.The permanent magnets is magnetized with Halbach pattern and each pole consists of three sections.The main magnetic pole is segmented on single side.The border magnetic pole and the main magnetic pole are not equal in thickness and width,and the permanent magnet is expanded to Hat type and T type.Using a precise subdomain model method,the solution domain is divided into four regions:slot,slot-opening,air gap and permanent magnet.The magnetic field density of airgap with load and electromagnetic torque is calculated under twodimensional polar coordinates.A 10-pole/12-slot three-dimensional motor model is established to perform electromagnetic simulation,hierarchical optimization and comparative analysis on Hat-type,T-type and other related five motor structures for finding the optimal Hat-type and T-type structures.The results show that partially-segmented structure of Halbach can reduce the permanent magnet eddy current loss,electromagnetic torque ripple and magnetic field density of airgap with loading.The electromagnetic performance of the partially-segmented structure of the T-type Halbach is higher than that of the Hat type,while the partially-segmented structure of the Hat type Halbach can further reduce the volume of the permanent magnet and save the production cost.Moreover,the equivalent stress and total deformations are calculated based on the three-dimensional finite element stress model of permanent magnetic synchronous motor,which are also in the tolerant range of mechanical strength.

关 键 词：永磁同步电机 精确子域模型法 Halbach部分分段结构 电磁转矩波动 永磁体 涡流损耗 

分 类 号：TM351[电气工程—电机]