Rotor eddy current loss analysis of permanent magnet rotor based on double Fourier transforms
1.School of Electrical and Information Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Faculty of Electronic and Electrical Engineering, Huaiyin Institute of Technology, Huaian, Jiangsu 223003, China
Abstract：To optimize the permanent magnet rotor structure and reduce the rotor eddy current loss, the rotor eddy current loss generated by slot effect of
air-gap magnetic field in surface-mounted high-speed permanent magnet synchronous motor was analyzed. The magnetization models of permanent magnets were investigated to establish the eddy current loss mathematic models of permanent rotor. The air-gap magne-tic field data samples were extracted based on the air-gap magnetic field static analysis. For permanent magnets with parallel magnetization or Halbach magnetization, the air-gap magnetic field space, time harmonics and the corresponding eddy current loss caused by air-gap permeance variation were investigated by double Fourier transforms. The eddy current loss was calculated by transient finite element analysis at non-load state. The results show that the permanent magnet rotor with Halbach magnetization mode can effectively reduce the high order harmonics, and the rotor eddy-current loss is 34% of that with parallel magnetization.
2013, Vol. 34 
