关键词: 控制器, 损耗, IGBT, 散热, 导热硅脂

Abstract: The motor controller was taken as the research object and the heat transfer performance and power module loss were analyzed. The finite element simulation software ANSYS was used to simulate the key process factors (cooling channel structure, water flow, thickness of thermal grease layer) affecting the controller's thermal performance. The results showed that the power module IGBT was the main heat source inside the motor controller, and its power loss was about 2 652 W. The cooling structure of the motor controller had a significant effect on the cooling effect. The cooling water in the water channel flowed mainly in the form of turbulent flow, and the cooling effect of S-shaped water channel structure was better. At the working condition of steady state, with the flow rate of the cooling medium increasing, the highest temperature of IGBT power module chip was decreasing. When the flow rate was 20 L/min, the maximum temperature of the chip was 105.5 ℃.The thermal grease had a significant effect on the cooling effect as well. When the thermal grease thickness was 100 μm, the maximum temperature of the chip was approximately 103 ℃.

Key words: motor controller, power loss, IGBT, cooling, thermal grease