采用多齿肋片的电机控制器散热器设计分析

电机控制器作为纯电动汽车的控制核心,其散热性能直接影响到驱动系统的可靠性。以某MOS多管并联的电机控制器样机为研究对象,将原设计的光滑肋片替换为多齿肋片结构,以MOS管芯片温升和肋片散热器重量为评价指标,对原散热器结构进行改进设计,并进行CFD数值分析。结果表明,相对于原设计的光滑肋片,多齿肋片结构增加了对流散热的表面积和换热系数,使得肋片的散热能力得到了提升。通过改变肋片数量、小齿的几何尺寸及位置分布,在不高于原设计的芯片温升的前提下,最优设计方案的肋片散热器重量轻化了6.41%。

Design and Analysis of Motor Controller Heat Sink with Multi-pins Fins

As the control core of the pure electric vehicle,the heat dissipation performance of the motor controller directly affects the reliability of the drive system.In this paper,a prototype motor controller with MOS multi-transistors parallel connection was taken as the research object,the original smooth fins was replaced with multi-pins fins structure,the temperature rise of MOS transistor chip and the weight of the fins were taken as the evaluation criteria,and the structure of the original radiator was improved and CFD numerical analysis was carried out.The results show that compared with the smooth fins,the multi-pins fins structure increases the surface area and heat transfer coefficient of convection heat dissipation,and the heat dissipation capacity of the fins is improved.By changing the number of fins,the geometric size and the position distribution of the pins,the weight of the optimal design of the fins is reduced by 6.41%under the premise that the temperature of the chip is no higher than the original structure.