Analytical Calculation and Optimization Analysis of Electromagnetic Performance of Halbach Partially-Segmented Permanent Magnet Synchronous Motors with Unequal Width and Thickness
Gao Fengyang1, Qi Xiaodong1, Li Xiaofeng1, Tao Caixia1, Gao Peng2
1. College of Automation and Electrical Engineering Lanzhou Jiaotong University Lanzhou 730070 China; 2. College of Electrical Engineering and Information Tianjin University Tianjin 300072 China
Abstract 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 partially-segmented 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 two-dimensional 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.
Gao Fengyang,Qi Xiaodong,Li Xiaofeng等. Analytical Calculation and Optimization Analysis of Electromagnetic Performance of Halbach Partially-Segmented Permanent Magnet Synchronous Motors with Unequal Width and Thickness[J]. Transactions of China Electrotechnical Society, 2022, 37(6): 1398-1414.
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2022, Vol. 37 
