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Vernier Permanent-magnet machine (VPMM) has been recognized in recent years as a substitute for permanent magnet synchronous machines (PMSM) in direct-drive applications such as wind turbine generators, motorcycles and electric vehicle/hybrid electric vehicle (EV/HEV) [1].
By appropriately inserting ferrite magnets into the rotor of a synchronous reluctance motor (SynRM), it is realized that the operational power factors and torque outputs of this SynRM can be improved.
Memory motors [1] [2] equipped with either single low-coercive force (LCF) or hybrid magnets have been extensively investigated due to the elimination of the associated excitation loss during the flux adjustment. Thus, they enable high efficiency operation within a wide range of speeds and loads. Very recently, switched-flux topologies that feature high torque density, simple rotor, and expedient...
Nowadays, numerous electrical machine topologies have been proposed and extensively investigated, which can extend the operating speed range together with the improvement of flux weakening capability without scarifying high efficiency. Amongst these machine topologies, variable-flux permanent magnet machines (VFPMs) are a competent candidate for electric vehicle/hybrid electric vehicle (EV/HEV) propulsion.
Pole-changing permanent magnet (PM) machines, which can offer wide operating speed range, have attracted global attention in industry application [1-3]. However, the previous pole-changing PM machines adopting distributed winding, suffer from lengthy end winding and relatively low efficiency. Therefore, this paper presents a new variable flux pole-changing PM memory machine (VF-PCPMMM) employing fractional...
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