In this paper, a new 20/22-pole in-wheel permanent magnet (PM) motor is proposed, designed and analyzed. It offers inherently negligible coupling between phases, namely, fault-tolerant characteristic. The developed slot and pole number combinations aim to ensure that a fault in one phase does not undesirably affect the remaining healthy phases. In addition, it should be noted that the cogging torque in the interior PM motor causes torque and speed ripples, as well as acoustic noise and vibration. Compared with the 20/24-pole IPM motor topology, the proposed 20/22-pole one offers improved cogging torque. The displacement angle of magnets in one pole also is investigated in order to reduce cogging torque. Finally, finite-element analysis results are given for verification.
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