Although three-phase PM motors are dominant in industry, multi-phase PM synchronous motors present higher torque-to-weight ratios, better efficiency and low torque ripple compared to 3-phase conventional PM motors. These features make fault tolerant multiphase PM motors become attractive for safety-critical applications. In this study, a novel PM multi-phase motor design with dual three-phase asymmetric stator winding is proposed. The winding structure of the proposed motor is unconventional due to selected slot-pole combinations. Therefore, an asymmetric winding is needed. Detailed finite element analyses of the proposed motor and performance comparison between conventional integer-slot (72-slot/12-pole motor) with symmetric winding and unconventional fractional-slot (78-slot/12-pole motor) PM motors with asymmetric windings is performed to see the benefits of the proposed motor. It was shown that the novel unconventional multi-phase PM motor has excellent torque quality and slightly higher torque density levels.Index Terms-Dual three-phase motor, multiphase PM motor, asymmetric stator winding, permanent magnet machine, synchronous motor, unbalanced winding.

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