轴向磁通永磁电机定子冷却结构设计及分析

Design and analysis of cooling structure for stator of axial flux permanent magnet motor

轴向磁通永磁电机发热源主要集中于定子侧,目前广泛采用壳体水冷进行散热。随着新能源汽车行业对电机功率密度的要求逐渐提高,对电机散热带来极大挑战。为提高定子侧散热能力,本文提出了一种水冷-热管相结合的混合冷却结构。本文采用有限元仿真分析,计算一台60 kw,3500 rpm水冷样机的温升,通过仿真值与实测值对比,验证有限元仿真的有效性。在该样机基础上,设计水冷-热管相结合的冷却结构,通过有限元仿真计算表明,加入热管结构后,能够有效提高定子散热能力。相比原先水冷结构,定子绕组温度降低11°C。

The heat source of axial flux permanent magnet motors is mainly concentrated on the stator side,and water cooling on motor housing is widely used for heat dissipation.With the increasing demand for motor power density in the new energy vehicle industry,the heart dissipation of the motor is facing great challenges.In order to improve the heat dissipation capability of the stator side,this paper proposes a hybrid cooling structure combing water cooling and heat pipes.This article uses finite element simulation analysis to calculate the temperature rise of a 60 kW,3500 rpm water-cooled prototype.By comparing the simulation values with the measured values,the effectiveness of the finite element simulation is verified.Based on the prototype,a cooling structure combing water cooling and heat pipe was designed.Finite element simulation calculations show that the addition of heat pipe structure can effectively improve the stator heat dissipation capacity.Compared with the original water-cooled structure,the temperature of the stator winding is reduced by 11°C.