Cooling System Analysis Of High Power Density Motor In Electric Vehicle

With the development of automobile industry, the increasing vehicle productionand sales help transport development, but it causes environmental problems andenergy problems. Electric vehicle drive motor is limited volume which works invehicle but it should have higher output power, which requires the drive motor has ahigher power density. On the other hand, the high power density increased loss. Dueto the loss, the heat generated will be more significant which could easily lead toinsulation aging and even burning motor. So how to make the heat dissipationeffective becomes a research priority. In this paper, the motor cooling system ismainly made the following study.Firstly, using fluid-structure interaction and finite element method to analyzethree typical water jacket structure cooling capacity. Application the basic principlesof heat transfer, establish the water jackets models, discussed three water jacket fluidvelocity. Using the results of velocity field calculate the convective heat transfercoefficient and study the temperature distribution of each water jacket and analyze thecooling capacity of the three water jacket.Secondly, discuss relationship between the structural parameters change and thewater jacket cooling capacity. By studying the different tank width and depth modelresearch the relationship between these parameters and the water jacket coolingcapacity.Thirdly, discuss how the coolant flow rates change in cooling system and usingdifferent coolant affects the cooling capacity. Different flow rates will change theconvective heat transfer coefficients and effects water jacket cooling capacity, so douse different coolant. Using water-cooling oil and water and ethylene glycol solventas coolant mode the cooling system and study each temperature distribution.Finally, the temperature experiment of spiral structure cooling system is carried.Comparing the experimental results with the simulation results prove thefluid-structure interaction and FEM simulation have correct results.