Investigation of Novel Variable Flux Reluctance Machines for Traction Application

With the increasing concerns about the price of rare-earth material, machines with less or no permanent magnet material have been extensively analyzed for application in electrical vehicles (EVs). As one typical magnetless machine, the variable flux reluctance machine (VFRM) is comprehensively investigated in this thesis in terms of operation principle, stator/rotor pole combination, winding configuration, power factor, current profiling technique, rotor shaping technique and design method.