Stator’s Temperature Field Simulation And Cooling Optimization Of Electric Vehicle Driving Motor

As the key component of electric vehicles,permanent magnet synchronous motor hasthe advantages of small volume and high power density,this makes the heating andcooling problem as one of the key problems in it’s design process. In order to improvethe radiating efficiency of the motors,this essay simulated the temperature field of themotor’s stator and optimized the motor’s cooling system by use of FLUENT software.The motor’s cooling optimization was followed in steps of heating powercalculation,thermal simulation,cooling system optimization and Simulation Verification.Firstly,the heating power of the motor’s main parts was calculated based on formula andexperimental data; then the finite element model for motor’s stator thermal simulationwas established after some equivalent and simplify process. The steady and transientstate temperature field of the stator under rated condition was obtained by computersimulation. The simulation result was verified valid and accurate through comparisonwith experimental data. According to simulations of three different specific type ofcooling structure and different cooling water flux,the conclusion of parallel channel andhigher water flux may benefit to heat radiation was got. To further optimize the structureof parallel channel, this essay established the cooling channel’s mathematical model ofthermal resistance, and got the optimal channel height and width through calculating theminimum value of objective function in the model. In addition,a method of which set upthree fin parallel with the cooling channel was put forward to rising the motor’s heatradiation surface area by40.16%. At last,the final project of optimization was obtainedby summarize the above mentioned points, and the simulation result shows thetemperature rise of the motor was reduced by9.6%after optimized and the validity ofthe optimization was tested.