关键词: 高速永磁电机, 冷却结构, 计算流体力学, 有限体积元法

Abstract: Serious heating of the motor will accelerate the aging of insulation materials and affect the performance of permanent magnets. Reasonable design of cooling structure can improve the heat dissipation capacity of the motor and ensure its safe and stable operation. A 40 kW, 40 000 r/min high-speed permanent magnet motor was taken as an example, and the spiral channel of the shell, the axial straight channel, the radial Z-shaped channel and the fin spiral channel were designed. The finite volume element method used used to compare and analyze the four water-cooling structures from the aspects of flow stability, pressure difference and heat dissipation, and reveal the optimal cooling channel structure.An integrated water-cooled and air-cooled hybrid cooling method was designed. A 3D simulation model was established by reasonable simplification and assumption of the motor, and the thermal simulation analysis of the motor was carried out based on CFD to confirm the effectiveness of the cooling method, which provides a certain reference for the design of high-speed motor cooling structure.

Key words: high-speed permanent magnet motor, cooling structure, computational fluid dynamics(CFD), finite volume element method