The objective of this article is to evaluate the self-cooling performance of a novel integrated flux-switching permanent magnet (FSPM) machine with an airfoil-shaped rotor. The rotor of the proposed integrated machine is functioning as both a rotor of the motor as well as an axial fan. It rotates to draw air from the ambient into the rotor and accelerate the flow through the rotor stage. The high-speed flow provides forced convection to the rotor, stator, windings, and magnets. Therefore, self-cooling is achieved. Accounting for manufacturing challenges of the airfoil blades, three-dimensional (3-D) printed blade caps are designed and assembled over the laminated rotor poles for the airfoil-shaped rotor. The electromagnetic performance of the continuous-skewed stator slot is compared with the step-skewed stator slot. Three housing configurations are proposed in terms of housing with radial inlets, housing with axial inlets, and no housing. The electromagnetic performance is verified by 3-D finite element analysis (FEA). The convective heat transfer coefficients of the three housing configurations are calculated by analytical methods and numerical simulations by 3-D computational fluid dynamics. The effect of encapsulations on the windings is also evaluated by FEA. A prototype machine is built and tested. Experimental results of measured temperature distributions on the stator and windings are included to validate the numerical simulation results.

中文翻译：

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翼型转子磁通切换永磁电机自冷性能评估


本文的目的是评估带有翼型转子的新型集成磁通切换永磁体 (FSPM) 电机的自冷却性能。所提出的一体机的转子既充当电机的转子又充当轴流风扇。它旋转以将环境中的空气吸入转子并加速通过转子级的流动。高速流动为转子、定子、绕组和磁体提供强制对流。因此，实现了自冷却。考虑到翼型叶片的制造挑战，设计了三维 (3-D) 打印叶片盖并将其组装在翼型转子的层压转子磁极上。将连续斜槽定子槽与阶梯斜槽定子槽的电磁性能进行了比较。提出了三种外壳配置：带径向入口的外壳、带轴向入口的外壳和无外壳。电磁性能通过 3-D 有限元分析 (FEA) 进行验证。三种外壳配置的对流换热系数通过 3D 计算流体动力学的分析方法和数值模拟进行计算。 FEA 还评估了封装对绕组的影响。原型机已构建并进行测试。包括测量定子和绕组上的温度分布的实验结果，以验证数值模拟结果。