Fluid-thermal characteristics of high-voltage line-start permanent magnet synchronous motor based on bidirectional hydraulic-thermal network coupling

This paper concerns the fluid-thermal characteristics of a high-voltage line-start permanent magnet synchronous motor (LSPMSM). A bidirectional hydraulic-thermal network coupling methodology is proposed and applied to the fluid-thermal characteristics calculation. The proposed method can fully account for fluid-thermal interactions to achieve an accurate prediction. According to the structural features of the motor with axial and radial mixed ventilation cooling, the global hydraulic network is established by connecting the local indenter elements and hydraulic resistances. The global thermal network is established based on heat source distribution and heat transfer paths. The temperature rise of the motor ranges from 45.8 K to 84.9 K. The hotspot appears at the lower end-winding on the drive side, and the lowest temperature rise occurs on the nondrive side of the shaft. Moreover, the experimental platform is built to verify the accuracy of the proposed method, and the relative error is 2.2% and 2.9%.