This paper presents a novel consequent-pole permanent magnet (CPM) machine featuring N-S-iron–S-N-iron sequences to eliminate the even-order harmonics of phase back electromotive force (EMF) and the unipolar leakage flux in the end region. The flux barrier is employed to improve the symmetry of the air-gap flux and reduce the saturation of the stator yoke, and hence the output torque can be improved. The proposed CPM machine, as well as its conventional counterpart with N-iron sequences, is optimized by finite-element analyses. Moreover, the electromagnetic performance of the proposed CPM machine, including the open-circuit air-gap flux density, back EMF, average torque, torque ripple, loss, efficiency, and unipolar leakage flux, is compared with the conventional CPM and surface-mounted PM (SPM) machines. Although both the proposed and conventional CPM machines have lower output torque than the SPM machine, the utilization ratio of PM material is increased by >33%. It is demonstrated that the proposed CPM machine has similar output torque and efficiency, but much lower torque ripple compared to the conventional one. Moreover, unipolar leakage flux does not exist in the end shaft of the proposed machine, and thus, the magnetization of the mechanical components can be effectively eliminated. Finally, the 9-slot/6-pole CPM machine is prototyped and measured to validate the analyses.

中文翻译：

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使用 NS-Iron-SN-Iron 转子消除偶极永磁电机中的偶次谐波和单极漏磁通

本文提出了一种新型的连续极永磁 (CPM) 电机，其具有 NS-iron-SN-iron 序列，以消除相反电动势 (EMF) 的偶次谐波和端部区域的单极漏磁通。磁障用于改善气隙磁通的对称性，降低定子磁轭的饱和度，从而提高输出转矩。所提出的 CPM 机器，以及其具有 N 铁序列的传统对应机器，都通过有限元分析进行了优化。此外，所提出的 CPM 电机的电磁性能，包括开路气隙磁通密度、反电动势、平均转矩、转矩脉动、损耗、效率和单极漏磁通，与传统 CPM 和表面贴装机进行了比较。 PM (SPM) 机器。尽管所提出的和传统的 CPM 机的输出扭矩都低于 SPM 机，但 PM 材料的利用率提高了 >33%。结果表明，所提出的 CPM 机器具有相似的输出扭矩和效率，但与传统机器相比，扭矩脉动要低得多。此外，所提出机器的端轴中不存在单极漏磁通，因此可以有效地消除机械部件的磁化。最后，对 9 槽/6 极 CPM 机器进行原型设计和测量以验证分析。但与传统的相比，扭矩纹波要低得多。此外，所提出机器的端轴不存在单极漏磁通，因此可以有效消除机械部件的磁化。最后，对 9 槽/6 极 CPM 机器进行原型设计和测量以验证分析。但与传统的相比，扭矩纹波要低得多。此外，所提出机器的端轴不存在单极漏磁通，因此可以有效消除机械部件的磁化。最后，对 9 槽/6 极 CPM 机器进行原型设计和测量以验证分析。