Optimal Analysis Of Flow Channels Of Liquid-cooled Motor In Electric Vehicle

Due to compact volume, high power density and relatively closed working condition of the driving motor in electric vehicle, production and dissipation of heat have become the important subject in the motor design. It is necessary to choosing liquid-cooling method to meet the cooling needs rather than conventional air-cooling method. The Computational Fluid Dynamics (CFD) software has been used to simulated the model for obtaining temperature characteristics of the motor. Experiments have been conducted on the model and Simulink software have been used to vertify the credibility of CFD method.The structure of flow channels can be divided into two types of series connection and parallel connection. Series connection is composed by axial structure, paralled structure and helix structure. Parallel connection is divided into two types by different location of inlet and outlet. All schemes have been simulated and temperature characteristics have been obtained to provide reference for practical application.Three cooling optimization have been proposed:The chamfer of flow channels should be optimized; a series researches have been expanded on structural parameters of straight fins, sunch as thickness, height and tilt angle; spoilers have been proposed to add in flow channels for enhancing heat transfer, and a variety structural schemes of spoilers have been designed. The temperature field and flow field of all schemes have been simulated by the Computational Fluid Dynamics (CFD) software. Through comparing the pros and cons of each scheme, the final structural optimizations have been obtained.