Analysis of Two Novel Five-Phase Hybrid-Excitation Flux-Switching Machines for Electric Vehicles

In this paper, two five-phase hybrid-excitation flux-switching (HEFS) machines with different stator topologies are designed and analyzed with the identical stator outer diameters and stack lengths. The electromagnetic performances, including the conventional static characteristics, such as phase flux, back-EMF, inductance, cogging torque and electromagnetic torque, and so on, are presented first. Then, both the flux-strengthening and flux-weakening capabilities are evaluated in detail according to the electromagnetic torque characteristics under different field currents with the help of 2-D finite element analysis. The corresponding predictions and conclusions indicate that the U-core topology is preferred for the five-phase HEFS machines.