Avaliação da capacidade de troca térmica de dissipadores com resfriamento líquido aplicados a inversores de tração elétrica

Abstract

High performance inverters are key components in electrical applications. The operating capacity, efficiency and life cycle of inverters can be limited by the magnitude of losses and external factors such as ambient temperature and humidity. To attenuate high levels of temperature, the use of heat exchange systems with liquid cooling is recurrent to reduce the temperature level and increase the full efficiency of the system. This papper presents the thermal study of losses in power modules and liquid cooling sinks that are performed and implemented in ANSYS to obtain thermal parameters, using Finite Elements Analysis (FEA). From the thermal impedance of the system and implementation of the Foster thermal network, the heatsink is validated in the software Typhoon Hil, making it possible to obtain the heatsink’s cooling profile for different loads connected to a three-phase inverter. In the validation step, a 50 kW RL load was connected to the three-phase inverter to evaluate the heatsink cooling capacity for different inverter operating conditions.