Design And Research On The Cooling System Of Pure Electric Vehicle Motor Drive System

With the energy shortage and the demands of the people on environmental protection, electric vehicles has been rapid development in recent years. And the motor as the "heart" of electric vehicle, whose performance determine the performance of electric vehicles. One of key issues is the motor and its controller cooling. The heat which generated during operation of the motor that impact on motor's physical, electrical and mechanical characteristics. When the tem-perature rises to a certain extent, the electrical insulation material change occurs in nature, and ultimately lose their insulating ability. On the other hand, with the increased of motor's tem-perature, motor's strength and hardness of the metal components will be gradually de-creased. Constituted by the controller of electronic components, also due to high temperature caused by the performance of electronic devices decrease adverse effects, such as high tem-peratures can cause semiconductor junction, circuit damage, Increase in resistance and even burn components.This paper is about a certain type of electric vehicle drive system cooling system design and research. Firstly, the three-dimensional of the motor and controller's heat sink are building by using UG. Without affecting the simulation accuracy of the premise, three-dimensional model is simplified. Import the file which is generated from three-dimensional model into the Ansys/Fluent software, and set the boundary conditions, and also analyse the temperature of motor and its controller. According to their temperature field distribution, motor's cooling channel and controller's cooling sink have been re-optimized design. the results of analysis showed that the temperature of the motor and its controller has significantly reduced after opti-mizing.After analysis, the electric vehicle components have been type design tthroughout the cooling system, including radiator, pumps, fans and so on. Type design is complete, the estab-lishment of a mathematical model of the entire cooling system, the use of Matlab/Simulink software characteristics of the cooling system were simulated. The entire cooling system on the results of bench test data and comparative analysis with the simulation results show that the simulation results meet the requirements.