Review of Thermal Design of SiC Power Module for Motor Drive in Electrical Vehicle Application

In the current vehicle electric propulsion systems,the thermal design of power modules heavily relies on empirical knowledge,making it challenging to effectively optimize irregularly arranged Pinfin structures,thereby limiting their performance.This paper aims to review the underlying mechanisms of how irregularly arranged Pinfins influence the thermal characteristics of power modules and introduce collaborative thermal design with DC bus capacitor and motor.Literature considers chip size,placement,coolant flow direction with the goal of reducing thermal resistance of power modules,minimizing chip junction temperature differentials,and optimizing Pinfin layouts.In the first step,algorithms should efficiently generating numerous unique irregular Pinfin layouts to enhance optimization quality.The second step is to efficiently evaluate Pinfin layouts.Simulation accuracy and speed should be ensured to improve computational efficiency.Finally,to improve overall heat dissipation effectiveness,papers establish models for capacitors,motors,to aid collaborative Pinfin optimization.These research outcomes will provide essential support for future developments in high power density motor drive for vehicles.

基于Fluent的电动汽车不同构型功率模块散热器对比

文章采用Fluent软件对用于绝缘栅双极型晶体管芯片的电动汽车不同构型散热器进行流体热仿真对比分析。为了验证流体数值模型的可靠性,先对菱形pinfin散热器进行了仿真分析,通过与试验数据的对比,表明了选择的流体模型、网格密度和材料参数的正确性。采用已经验证过的数值模型,建立了圆柱pinfin散热器构型,同时保证其压力损失与菱形pinfin散热器一致以确定尺寸。通过添加功率模块的功率损失,对这两种构型散热器进行了热仿真分析。通过对比可以发现,圆柱形pinfin散热器的功率模块结温会比菱形的高约1.5%,散热器的表面最高温度则基本保持一致,但均符合产品设计标准。考虑到圆柱形构型可以将pinfin结构减重27%,其将是功率模块散热器的更佳选择。本研究通过验证的数值模型,快速分析功率模块的散热与温度分布,选择更优的pinfin结构,减少了后期试验成本与产品开发时间。