轴向磁通永磁电机冷却结构设计与温度场分析

Cooling Structure Design and Temperature Field Analysis of Axial Flux Permanent Magnet Motor

为解决轴向磁通永磁电机散热难题,通过降低永磁体涡流损耗并采用水冷方式来限制电机温升。以一台25 kW、3000 r/min轴向磁通永磁电机为研究对象,分析永磁体分块对永磁体涡流的影响,确定永磁体分5段为综合最佳方案。设计两种水冷结构,分别是轴向内外螺旋水道和轴向内外U形水道。通过建立电机温度场分析模型,进行流固耦合的仿真计算,对比两种水冷结构的冷却效果,结果表明,U形结构冷却效果优于螺旋结构。

In order to solve the problem of heat dissipation of axial flux permanent magnet motor,the temperature rise of the motors was limited by reducing the eddy current loss of the permanent magnets and using the water cooling method.A 25 kW,3000 r/min axial flux permanent magnet motor was taken as the research object to analyze the impact of permanent magnet block segmentation on permanent magnet eddy currents,and the permanent magnet was determined to be divided into five stages as the best comprehensive scheme.Two water-cooled structures were designed,namely the axial inner and outer spiral channels and the axial inner and outer U-shaped channels.By establishing the temperature field analysis model of the motor and the simulation calculation of fluid-structure interaction,the cooling effect of the two cooling structures was compared,and the results showed that the cooling effect of the U-shaped structure was better than that of the spiral structure.