Abstract Outer-rotor permanent magnet machines for low-speed and high-torque applications have been used due to their high moment of inertia and torque density. In this paper, the 12-slot/10-pole outer-rotor fractional-slot permanent magnet machine model is established by finite element analysis, the influence of unequal stator tooth width and tooth tip width is investigated for the PM machine, and five different schemes of stator tooth and tip width are designed and analyzed. Detailed comparisons of the performance characteristics of the machines are presented including important issues such as output torque, magnetic field distribution, and tooth flux density. It is shown that the torque density and cogging torque and efficiency can be effectively improved by choosing reasonable tooth and tip width, which lays a foundation for further optimum design and efficiency improvement of the machine.

中文翻译：

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定子齿宽不等对外转子永磁电机性能的影响

摘要 用于低速和高扭矩应用的外转子永磁电机由于其高转动惯量和扭矩密度而被广泛使用。本文通过有限元分析建立了12槽/10极外转子分数槽永磁电机模型，研究了永磁电机定子齿宽和齿尖宽度不等的影响，并分析了五种不同的永磁电机。设计并分析了定子齿和齿尖宽度的方案。介绍了机器性能特征的详细比较，包括输出扭矩、磁场分布和齿磁通密度等重要问题。结果表明，通过选择合理的齿宽和齿尖宽度，可以有效提高扭矩密度、齿槽扭矩和效率，