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In recently years,the increasing attention has been given to high speed drives for wider range of industrial applications, such as flywheel energy storage, compact micro generation gas turbines, aircraft electrical starter-generator systems and compressors [1].
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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