Cooling System Design and Thermal analysis of a PMSM for Rail Transit

In the field of rail transit, permanent magnet synchronous motor (PMSM) is widely used due to high power density, high efficiency and small volume. Temperature is an important factor affecting motor performance, so it is necessary to analyze the temperature of the motor. In this paper, the thermal analysis considering thermal contacts and the cooling system design for a permanent magnet synchronous motor are investigated. The calculation methods of heat source and heat transfer coefficient are introduced. The finite element method (FEM) is used for temperature analysis. In the simulation model, the copper and insulation of the winding are simplified into an equivalent material. Finally, the cooling effects of axial direction and circumferential direction are compared.