Analytical Modeling and Analysis of Magnet Harmonic Loss in Fractional Slot Permanent-Magnet Machines
Chen Zhenfei1, Xing Ning1, Ma Hongzhong1, Li Zhixin2, Zhang Huangyong1
1. College of Energy and Electrical Engineering Hohai University Nanjing 211100 China; 2. Marketing Service Center State Grid Jiangsu Electric Power Co. Ltd Nanjing 210019 China
Abstract：The key to optimize winding layouts and reduce magnet eddy-current loss of fractional slot permanent-magnet machines is to calculate the loss under armature magnetic field and investigate the variation of harmonic loss with winding layouts. To solve this problem, this paper proposes a current density modeling method of four-layer winding to realize the modeling of three- phase/dual-three-phase, double-layer/four-layer windings. Based on the subdomain model, the slot area of four-layer winding is further divided into the top-layer winding part and the bottom-layer winding part, the boundary condition between the two winding parts is added, and the harmonic coefficients of each subdomain are determined. The analytical model of eddy-current loss is established by solving the transient armature magnetic field. Four 10-pole/12-slot machines with different windings are taken as examples to validate the proposed model by finite element simulation. Based on the proposed model, the variation of harmonic eddy-current loss with the number of winding phases and layers is summarized and analyzed by magnetomotive force, which provides some ideas for optimizing the winding configurations to reduce eddy-current loss.
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2022, Vol. 37 
