Abstract
Permanent magnet synchronous machines (PMSM) have high torque density, efficiency, power factor and so on compared with other type of machines. PMSMs can be separated into traditional well-known distributed wounded (DW) machines and fractional slot concentrated winding (FSCW) machines [1]. FSCW machines own low cogging torque, compact structure, high power density, and convenient fabrication, etc. However FSCW produces richer stator MMF harmonics, which induce large rotor eddy current loss in conductive Nd-Fe-B magnets. Because the loss is difficult to dissipate within the rotor, large heat brings out high temperature rise, which will demagnetize the magnets and cause breakdown of machine. The machines with 1/2 slot/pole/phase may be a tradeoff of compactness and lower rotor loss and have better flux-weakening ability equipped interior permanent magnets.
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