一种新型混合励磁分段转子开关磁阻电机

分段转子开关磁阻电机磁路短、损耗小,但功率密度低。在该电机的定子槽口增设12块永磁体,构成一种新型12/8极混合励磁分段转子开关磁阻电机。介绍混合励磁分段转子开关磁阻电机的拓扑结构和工作原理,建立电机的数学模型,分析永磁体的工作模式,并用等效磁路法验证其增磁作用。使用有限元法仿真其静态和动态特性,分析永磁体厚度对电机的影响、在不同电流下永磁体转矩与总转矩的占比关系。与传统分段转子开关磁阻电机进行对比,混合励磁分段转子开关磁阻电机的平均转矩提高10.7%,转矩脉动减少11.1%。

A Novel Type of Hybrid Excitation Switched Reluctance Motorwith Segmental Rotors

Switched reluctance motor with segmental rotor (SSRM) has short magnetic paths and low losses, but it has low power density. This paper presents a novel 12/8 hybrid excitation switched reluctance motor with segmental rotors (HESSRM),which has 12 permanent magnets located at the stator slot opening. Firstly, the topology structure and working principle of HESSRM is introduced. The mathematical model of the motor is established, and the working mode of the permanent magnet is analyzed. The equivalent magnetic circuit method is established to validate magnetization effect of permanent magnets. Secondly, the finite element method (FEM) is used to obtain the static and dynamic characteristics of HESSRM. Then, it is analyzed of the influence of the thickness of the permanent magnet, and the proportion of the torque generated by the permanent magnet at different currents. Finally the HESSRM is compared with the SSRM at the same size. The simulation results show that the proposed HESSRM average torque is increased by 10.7% and the torque ripple is reduced by 11.1% than conventional SSRM.