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The temperature of electrical machine is determined by the cooling effect and the temperature rise can affect the service life and the power rating of machines. Therefore, improving the method of cooling the machine has an important practical significance. In this paper, a 12-slot high speed PM machine is investigated. The three-dimensional fluid field modes with oil cooling and mixture cooling of air and water are established based on the fluid dynamics theory and the corresponding boundary conditions are given. The calculated value based on the coupled analysis of fluid field with temperature field shows the validity and feasibility of the cooling structure.

Research on Different Cooling methods for High Speed Permanent Magnet Machine