低地板轻轨车牵引变流器通风散热设计

Design of Ventilation and Heat Sinking for Low Floor Vehicle Traction Converter

采用强迫风冷的变流器必须进行通风散热设计,选用通风机需要考虑的因素为其风量和风压,风量取决于变流器功率损耗,风压与箱体风道设计有关,根据风量确定风机后,风压决定风机的实际工作点;选用散热器的依据为散热器热阻,热阻值取决于通风条件和变流器功耗。对轻轨车牵引变流器功率损耗进行了计算,分析了功率损耗与所需风量以及散热器热阻之间的关系,并通过专业软件fluent,对箱体风道进行CFD仿真和设计,进而结合相关国家标准选择了合适的通风机和散热器。实验结果表明,风道设计以及通风机和散热器的选择合理,符合要求。

Converter using forced air cooling needs reasonable design of ventilation and heat sinking, the selection of ventilator must be in accordance with wind flux and wind pressure, the selection of wind flux lies on the power consumption, wind pressure is relative to design of the wind route; the selection of heat sink must be in accordance with the thermal resistance which lies on the ventilation condition and power consumption of the converter. Based on the power consumption calculation of the traction converter, the relation between power consumption and wind flux was analyzed, so does the thermal resistance. The design of the wind route was sim- ulated by the software called CFD . Then the ventilator and heat sinking were selected appropriately. The ex- periment result indicates that the selection of the ventilator and the heat sinking are up to the demands.