While electrical machine designers typically go to great lengths to choose the optimal number of stator slots based on the electromagnetic performance, often the thermal aspects of this selection are overlooked. This article investigates the multi-domain impacts related to the slot number selection, combining both the electromagnetic and thermal aspects. Taking an existing 42-kW 4-pole, 12-slot electrical machine with Halbach-array surface-PM rotor, used within a more-electric marine engine as a case study, performance aspects of the machine with different slot numbers are investigated. The impact of slot number is compared considering the losses, output torque and its quality, as well as the peak temperature. Experimental tests are performed, verifying significant temperature reductions and performance entitlements when the optimal stator slot number from thermal point of view is selected. Finally general guidelines on slot number selection for temperature reduction are provided.

中文翻译：

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插槽号对电机的热影响

尽管电机设计人员通常会花很多精力来根据电磁性能选择最佳数量的定子槽，但常常忽略了这种选择的热学方面。本文结合电磁和热学方面，研究了与插槽号选择相关的多域影响。以现有的带有Halbach阵列表面PM转子的42 kW 4极，12槽电机为例，该电机用于更多电动船用发动机，研究了不同槽号的电机的性能。考虑损耗，输出扭矩及其质量以及峰值温度，比较插槽编号的影响。进行实验测试 从热的角度出发，选择最佳的定子槽号时，可以验证温度的显着降低和性能要求。最后，提供了用于降低温度的插槽号选择的一般准则。