Design and Analysis of an Integrated Magnetic-Geared Hybrid Excitation Machine for Electric Vehicles

This paper presents an integrated magnetic- geared hybrid excitation motor for electric vehicles (EVs). It can offer advantages of high torque density, low-speed high-torque operation and large speed adjusting range. The key is to integrate the flux- modulation poles which can effectively modulate high- speed rotating field of the armature and the low-speed rotating field of magnetic poles into hybrid excitation motor. For the proposed integrated motor, the pole arc coefficient, the thickness of permanent magnet and the relationship among the number of magnetic pieces and magnetic pole pairs are analyzed and discussed. The static and dynamic performances of the proposed motor are calculated using the 2-D and 3-D finite element method (FEM), which verifies the effectiveness of the theoretical analysis.