Characteristic Analysis and Comparison of 12/8 Flux Switching Motors with Different Segmental Rotor Structures

In this paper, an flux barrier is added in rotor to solve the positive and negative half cycle asymmetry of the phase winding back electromotive force(EMF) in flux switching motor with segmental rotor(SFSM). By analyzing the mathematical model, it is deduced that after the flux barrier is increased on the rotor, the change of permeability will lead to the change of the air gap magnetic density of the motor. Through the finite element (FEM) parametric simulation, the optimal size of the flux barrier is obtained. The FEM analysis shows that the motor has a high sinusoidal inductance waveform compared with the traditional motor, and the even harmonics in the back EMF of the phase winding are greatly weakened. Finally, an prototype is manufactured, and the experimental results verify the correctness of the proposed topology.