部分分段Halbach永磁同步电机优化设计

Optimization Design of Partially-Segmented Halbach Permanent Magnet Synchronous Motor

针对高功率密度的永磁同步电机齿槽转矩及永磁体涡流损耗大的问题,设计一种部分分段Halbach结构的表贴式永磁同步电机,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。采用精确子域模型法,将求解域划分为永磁体、气隙、槽身和槽口四个区域,在二维极坐标下计算电机空载气隙磁通密度及齿槽转矩。建立10极12槽三维电机模型进行电磁仿真分析。结果表明,部分分段Halbach结构降低了永磁体涡流损耗、齿槽转矩及永磁体体积。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,确保部分分段结构永磁体的机械强度维持在允许范围内。

In order to suppress the cogging torque and reduce the eddy current loss in high power-density permanent magnet synchronous motor,a surface-mounted partially-segmented Halbach structure is designed.The permanent magnets is magnetized with Halbach pattern and each pole is divided into three sections.The main magnetic pole is segmented on single side.The boundary magnetic pole and the main magnetic pole are not equal in thickness and width.A precise subdomain model method is used to divide the solution domain into four regions:permanent magnet,air gap,slot and slot-opening.The magnetic field density of no-load airgap and the cogging torque are calculated under two-dimensional polar coordinates.The 3-D electromagnetic field analysis is carried out with a 10-pole/12-slot permanent magnetic synchronous motor.The simulation results show that the eddy current loss,the cogging torque and the volume of permanent magnet are reduced by partially segmented Halbach structure.Moreover,the equivalent stress and total deformation are calculated based on a 3-D finite element stress model of permanent magnetic synchronous motor,which are also in the tolerant range of mechanical strength.