机车电传动 (Jan 2020)
Research on Effect of Air Gap between IGBT Module and Heatsink on Thermal Performance
Abstract
Thermal grease is used to reduce the contact resistance of the contact interface between the IGBT module and the heatsink in the field of rail transit. Because of the frequent vibration and the cyclic temperature fluctuation of the IGBT module, the thermal grease could volatilize, flow out, and even dry up, which could cause an air gap between the module and the heatsink, heat transfer conditions was worsen. The effect of the air gap on the temperature of the IGBT junction and the shell has been studied based on numerical simulation and experiment. The results showed that the air gap has less influence on the junction temperature in the intial stage, with the expansion of the air gap, the junction temperature increase obviously and lead to the declining of the life of the IGBT module, and even IGBT module rapidly damage.
