Motor’s Stator Temperature Field Analysis And Experimental Verification Of Dynamic Coupling For HEV

Water-cooled permanent magnet synchronous motor for hybrid electric vehicles has a small volume. Its power is high and there is oil in its working environment, making the cooling condition worse and working environment more complicated, which influences the cooling of the whole motor. In this paper, we chose a water-cooled permanent magnet synchronous motor for hybrid electric vehicles to study its temperature field. By simplifying and equalizing the model of the motor stator, using thermal-fluid simulation software CFX, the temperature field was calculated and simulated. And the simulation result was proved accurate by experimental verification, which insured the motor working in the safe temperature range.In this paper, according to the "motor loss calculation-model simplifying and equivalent-FEM-experimental verification" order, the temperature field of the motor stator was studied and analyzed. Firstly, the heating power of the motor’s main parts was calculated based on formula and experimental data; then the motor windings, stator core and other components was simplified; lastly, the thermal analysis finite element model of the motor stator was established. According to finite element simulation result, the temperature distribution of stator at steady-state and transient state under rated working conditions was obtained.By comparing the experimental data with the temperature analysis result, we find that the key heating component of motor such as stator core, windings and chassis are all working in the safe temperature range, the deviation of analysis result and experimental data was controlled in less than5%, which proved the accuracy and validity of the simulation results, the motor will not be burned because of overheat.