Parametric design optimization of axial field partitioned stator switched flux PM machine

An axial field switched flux permanent magnet (AFSFPM) machine possesses desirable advantageous performance since it combines the merits of both axial field permanent magnet (AFPM) and switched flux permanent magnet machines (SFPM). In this study, an axial field partitioned stator switched flux permanent magnet (AFPS-SFPM) machine has been individually optimized for maximum torque. Also, the influence of the slot shape on the machine performance has been investigated. It is found that higher torque can be obtained with parallel slot opening compared to radial slot opening. Furthermore, the effect of rotor iron piece shapes on the machine cogging torque is examined. It is shown that the machine torque ripple can be significantly reduced when the rotor iron piece edges are changed to be rounded border instead of flat shape. Moreover, a comparison between the initial and optimized machines has been carried out. It is concluded that the optimized machine has higher torque with less torque ripple compared to the initial machine.