Cooling Simulation and Analysis of Water-Cooling Motor Case

• Main Authors: Hong Kun Lin, 林宏錕
• Other Authors: Tswen-Chyuan Jue
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/4a6rfb

碩士 === 國立虎尾科技大學 === 車輛工程系碩士班 === 101 === Because of the environmental awareness rising, electric vehicles are developing rapidly. Also, the motor which is the power source of electric vehicles is in the rapid development. During the operation of motor to transform electrical energy into kinetic energy, an energy loss always exists and most of the energy loss becomes heat. Especially, the demand of the motor power density becomes higher and higher today. The traditional forced air cooling is unable to meet the demand. Because the liquid cooling can take away more heat and keep the high-load motor operating more efficiency, the water-cooling motor becomes more important than before. This study is to numerically investigate the flow, temperature fields of the water flow existing between the motor shell and the motor cooling fins. using a computer-aided design software Pro-Engineer creates a geometrical model and then applying commercial computational fluid dynamics software FLUENT solves the mass, momentum and energy conservation equations. Comparing the averaged flow outlet temperatures between simulations and experiments, an agreeable result are obtained and it proves the simulation is acceptable. This study explores various flow channels of the different fin thickness, fin numbers and analysis fin temperature distribution of water-cooled motor shell, cooling effectiveness and pressure drop of cooling water. The results show that increase in the numbers and thickness of cooling fin can also increase the flow resistance. When the number of fins increase to 6 or 7 pieces and the effect of fin thickness will go steady. As the number and thickness of fins increase, the cooling flow contacts to more fin surface and takes away more heat. It also causes the outlet fluid temperature rise. This study suggests that using six 4mm fins and seven pieces fins with thickness 3mm will be suitable for the water cooling motor.