Field weakening performance of flux-switching machines for hybrid/electric vehicles

Flux-switching machines (FSMs) are a viable candidate for electric propulsion of hybrid/electric vehicles. This paper investigates the field weakening performance of FSMs. The investigation starts with general torque and voltage expressions, which reveal the relationships between certain parameters and the produced torque and induced voltage of this machine. Based on the understanding of these relationships, a number of methods for reshaping the torque-speed characteristic of an FSM design are proposed and validated using finite element analysis (FEA).