Optimization Design of Partially-Segmented Halbach Permanent Magnet Synchronous Motor
Gao Fengyang1, Qi Xiaodong1, Li Xiaofeng1, Yuan Cheng1, Zhuang Shengxian2
1. School of Automation and Electrical Engineering Lanzhou Jiaotong University Lanzhou 730070 China; 2. School of Electrical Engineering Southwest Jiaotong University Chengdu 610031 China
Abstract：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.
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2021, Vol. 36 
