Abstract
A six-phase permanent magnet synchronous machine (PMSM) with a new fractional-slot winding arrangement is proposed for the electric vehicle application. With a 105° electrical angle between the two sets of three-phase windings, the most harmful 5th harmonic in the air-gap magnetomotive force (MMF) can be completely cancelled in a 7-pair-pole machine. To highlight its advantages, a comparative study is performed by Finite element analysis (FEA). When compared with a conventional 12-slot/14pole three-phase machine and a conventional 12-slot/14pole six-phase machine equipped with fractional-slot concentrated winding (FSCW), the machine with the proposed winding arrangement can offer lower losses, high efficiency, lower torque ripple and lower required voltage of battery.
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