Design and Performance Characterization of a Novel Low-Pole Dual-Stator Flux-Switching Permanent Magnet Machine for Traction Application

The purpose of this paper is to characterize the performance of a novel dual-stator six-slot four-pole (6/4) flux-switching permanent magnet (FSPM) machine. The proposed dual-stator 6/4 FSPM machine topology eliminates even-order harmonics in the flux linkage and back-electromotive force, which exist in the conventional single-stator single-rotor topology. The resulting back-electromotive forces of the proposed dual-stator machine are balanced and sinusoidal waveforms. Design principles including sizing equations for the machine are studied based on the flux linkage harmonic contents and generalized sizing laws. The performance characterization is studied for two possible topology variations of the dual-stator structure. A design for a 30-kW traction application is investigated to demonstrate good constant power operation capability. The low fundamental frequency requirement of the dual-stator 6/4 FSPM machine is beneficial to the reduction of iron loss at high-speed conditions. High efficiency is achieved for the majority of the speed range, particularly at the high-speed regions.