Abstract
A novel modular-spoke-type permanent magnet (MSTPM) machine is proposed in this paper. Firstly, the geometric topology and operating principle of MSTPM machine are briefly introduced. Then, the permanent-magnet magneto-motive-force (PM-MMF) and no-load radial air-gap flux density in a pair of MSTPM machine and conventional surface-mounted permanent magnet (SPM) machine are compared. Further, the even-order harmonics and unbalanced magnetic force (UMF) in MSTPM machines are analyzed and eliminated by using specific combinations of stator-slot and rotor-pole numbers. Then, the electromagnetic torque is optimized to achieve high torque and low torque ripple based on analytical formula and finite element analysis (FEA) methods. Finally, the electromagnetic performance of an MSTPM machine and a commercial outer-rotor (OR) SPM machine for in-wheel traction application are compared. The analytical results are verified by FEA predictions.
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