关键词: 电动汽车, 轮毂电机, 内嵌V型结构, 气隙磁密, 齿槽转矩

Abstract:

A permanent magnet hub motor with embedded V-shaped magnetic circuit structure was proposed, according to the higher requirements of the wheel rim drive system on the output torque and dynamic ride comfort of the hub-motor, the structure made full use of the inner space of the rotor core to improve the air-gap magnetic flux density and the overload resistance. The effective magnetic flux and leakage flux were calculated by the equivalent magnetic circuit method to verify the feasibility of the magnetic circuit structure. The relations of homopolar permanent magnet angle and the thickness of permanent magnet magnetizing direction to the thickness of the air-gap flux density and to the relationship between the cogging torque were analyzed to obtain the optimal combination scheme. Further simulation results of the prototype model show that the embedded V-shaped structure is suitable for the permanent magnet rotor used in the hub motor, which verifies the correctness of the analysis results.

Key words: electric vehicles, hub-motor, embedded V-shaped structure, air-gap flux density, cogging torque