关键词: 高速永磁同步电机, 冷却系统, 流固耦合, 流体场, 温度场

Abstract: In order to study the influence of hybrid cooling structure on the heat dissipation performance of high-speed permanent magnet synchronous motor, a 450 kW, 23 000 r / min high-speed permanent magnet motor was taken as an example. According to the basic theories of hydrodynamics and numerical heat transfer, reasonable assumptions and boundary conditions were given, and a three-dimensional fluid thermal coupling solution domain model was established. In view of the serious heating of the rotor of high-speed permanent magnet motor, a set of air-water mixed cooling system with radial ventilation structure and stator sectional radial ventilation was established. The finite volume method was used to solve the three-dimensional model. The influence of cooling water speed on the temperature rise of the motor was studied, and the influence of stator sectional size and inlet ventilation on the temperature rise of the rotor was analyzed. The results show that the cooling structure can effectively inhibit the maximum temperature rise of the rotor, which provides a reference for the design of the cooling system of high-speed permanent magnet synchronous motor.