Research Of The Heat Transfer On Mine-used Inverter And Optimization Analysis Of Water-cooled Heat Exchangers

With the rapid development of power electronics technology, high-power inverter taken more and more attention with its superior energy efficiency and speed control performance. But also produced a lot of problems, such as the heat generated by the power device IGBT module which cannot be effectively disseminated to the external environment, as a result of the performance of power device is reduced. Ther-efore, it’s essential to research the characteristics of frequency converter heat transfer, and has important practical significance.The main work of the paper is to analysis the heat dissipation characteristics of75KW shearer traction frequency converter and optimization the structure of water-cooled heat exchangers.Using numerical analysis software,the heat transfer and pressure drop characte-ristic of water-cooled inverter were analyzed in different conditions, such as the installation position of IGBT module、the arrangement of IGBT model、the thickness of inverter baseplate、the material of water-cooled heat exchanger、different flow rate and the temperature of water in inlet. On this basis, the water-cooled heat exchangers deformation under thermal stress and fluid pressure was analyzed through one-way fluid-structure-thermal coupling. Meanwhile, the thermal resistance of frequency con-verter baseplate and water-cooled heat exchangers along with the change of inverter baseplate was analyzed, as a result of the thermal spreading angle.In accordance of the knowledge of computational fluid dynamics and heat transfer, we established the mathematical model of the heat transfer performance and the differential pressure from inlet to outlet when change the size of the waterways, opti-mize the structure of the water-cooled plate in the traditional optimization toolbox MATLAB. Meanwhile, according to the distribution of temperature field of inverter, we improve the type of structural of waterways, such as the bi-S type channel, S with center entrance type channel and add shunt in flow channel, comparison and analysis of overall performance of these different kinds of flow channel structure. Finally, We use APDL to create the parametric model of inverter and macro file to calculate the average temperature for each IGBT chip. Then use the Visual Basic to write the thermal simulation interface, generated a text file of APDL programming language after input the relevant parameter date, use the ANSYS batch function call the newly generated text file to analysis. After the end of analysis, displayed the results on the interface.