Investigation of a novel rotor permanent magnet flux switching machine for EV and HEV applications

For electric vehicles and hybrid electric vehicles applications, the stator permanent-magnet flux-switching (SPM-FS) machines have attracted considerable attentions due to the benefits of high power density and improved reliability. However, due to the existence of magnets on the stator, the slot areas for the armature windings are significantly reduced, leading to an increased copper loss and suffering from serious iron saturations with large currents. Hence, to further enhance the torque overload capability, a simple concept of rotor-PM flux-switching (RPM-FS) machine is proposed by removing the magnets from stator to rotor meanwhile keeping the flux-switching principle. In this paper, the influence of the rotor pole number on electromagnetic performance of a RPM-FS machine with 24 stator slots is investigated based on 2D finite element analysis(FEA).