In this article, a hybrid permanent magnet (PM) motor with offset placement design is proposed. In the proposed design method, the center axes of rare-earth PM and nonrare-earth PM are shifted artfully to improve motor performances, including output torque and antidemagnetization capability. The relationship among the PM offset placement, current angle, and electromagnetic performances is established. In order to reduce the current angle to achieve maximum output torque, the PM shift angle is preliminarily designed. To further improve motor performances, a multiobjective optimization approach is subsequently carried out for optimal motor design. In addition, to demonstrate the advantages of the PM offset placement, a symmetric placement PM motor is included to be compared with the proposed offset-placement hybrid PM motor based on electromagnetic characteristics. Finally, a prototype motor is built and tested. Based on simulation and experimental results, it is proven that the PM offset design can improve motor performances while it provides a new research path for hybrid PM motors.

中文翻译：

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永磁体偏置放置的混合式永磁电机的转矩分量重新分配和增强

在这篇文章中，提出了一种具有偏移放置设计的混合永磁 (PM) 电机。在所提出的设计方法中，稀土永磁和非稀土永磁的中心轴巧妙地移动，以提高电机性能，包括输出扭矩和抗退磁能力。建立了 PM 偏移位置、电流角和电磁性能之间的关系。为了减小电流角以达到最大输出扭矩，初步设计了PM换档角。为了进一步提高电机性能，随后采用多目标优化方法来优化电机设计。此外，为了展示 PM 偏移放置的优势，包括一个对称放置的 PM 电机，以根据电磁特性与提出的偏移放置混合 PM 电机进行比较。最后，构建并测试了原型电机。基于仿真和实验结果，证明永磁偏置设计可以提高电机性能，同时为混合永磁电机提供了一条新的研究路径。