Abstract: The IGBT component is the core component of the motor controller, and its heat dissipation performance directly affects the stability of the controller. According to the heat dissipation requirements of an IGBT component, on the basis of the traditional rectangular heat-dissipating fins, an isosceles triangular heat-dissipating fin with 3 mm bottom and 1 mm height and an isosceles trapezoidal heat-dissipating fin with 1 mm upper bottom, 3 mm lower bottom and 1 mm height were designed. Three-dimensional modeling and theoretical junction temperature calculations were performed respectively on the IGBT modules of the three kinds of heat radiators. And the computational fluid dynamics analysis software STAR-CCM+ was used to numerically simulate the IGBT modules of three kinds of heat dissipating fins with different fin heights, fin thicknesses and fin spacing. The temperature field and vector field of the IGBT module were analyzed. The results show that that the error between the simulation results and the theoretical calculation results is about 5%. And the heat dissipation performance of IGBT module of the three kinds of heat radiators is the best when the fin height is 34 mm, the fin thickness is 2.8 mm and the fin spacing is 2.8mm.

Key words: vehicle engineering, STAR-CCM+, IGBT, heat dissipation, thermal simulation

摘要： IGBT元件作为电机控制器的核心元件，其散热性能将直接影响到控制器的稳定性。根据一种IGBT元件的散热要求,在常规矩形散热器的基础上设计了底为3 mm，高为1 mm的等腰三角形散热器和上底为1 mm，下底为3 mm，高为1 mm的等腰梯形散热器。分别对3种散热器的IGBT模块进行了三维建模和理论结温计算，并利用计算流体力学分析软件STAR-CCM+对3种IGBT模块在不同翅片高度、翅片厚度及翅片间距下进行了数值模拟。通过分析IGBT模块的温度场和矢量场，结果表明：仿真结果与理论计算结果误差均在5％左右；且3种散热器下的IGBT模块在翅片高度为34 mm、翅片厚度为2.8 mm以及翅片间距为2.8 mm时，其散热性能能够达到最优。

关键词: 车辆工程, STAR-CCM+, IGBT, 散热, 热仿真