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This paper presents a comparative study of three types of doubly salient machines (DSMs), i.e. wound field variable flux machines (VFMs), hybrid-excited stator slot permanent magnet machines (HSSPMs), and stator slot permanent magnet machines (SSPMs). Two dimensional finite element (FE) modelling is carried out to investigate the electromagnetic performance of the VFM and the SSPM based on a global...
Due to high torque density, low torque ripple, high efficiency, excellent fault-tolerance capability and convenient manufacturing, fraction-slot concentrated windings (FSCWs) are desirable to be used in high performance permanent magnet (PM) synchronous machines.
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].
Since vernier permanent-magnet machine (VPMM) has the merit of low-speed operation with high output torque due to the “magnetic-gearing” effect [1], they have been used in the direct-drive applications such as wind power generator, electric vehicle/hybrid electric vehicle (EV/HEV) [2,3].
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...
Traditional direct-drive permanent magnet synchronous machine (PMSM) suffers from large bulk and complex topology structure [1], which extremely limits its industrial applications. As a novel embranchment of PMSM, PM vernier machine (PMVM) incorporates the magnetic gear effects into conventional PMSM producing high torque at a relatively low speed, which is desirable for direct-drive applications...
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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