Magneticthermal bidirectional coupling of in wheel motor for electric vehicle
                                     ZHANG Lulu1，YAN Yecui1，MA Qihua1，ZHANG Dongjian2，CHEN Tao1
(1.School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai 201620, China; 2.School of Mechanical and
 Electronic Engineering, Sanda University, Shanghai 201209, China)

Abstract: Aiming at the problems such as large thermal load and significant temperature rise of electric vehicle inwheel motor, the electromagnetic field and temperature field of the inwheel motor was simulated. Firstly, a geometric model of the external rotor inwheel motor was established. Based on the finite element model of electromagnetic field and the equivalent thermal network model, the magneticthermal bidirectional coupling was used to realize the exchange of two physical fields loss and temperature data, and finally accurately calculated the motor loss and temperature rise. The simulation results of the magneticthermal bidirectional coupling were verified by the loss and temperature rise test. Finally, the method was used to parameterize and analyze the inwheel motor structure. The results show that the temperature of stator core and winding increases with the increase of airgap length. As the depth of stator groove increases, the stator core temperature increases first and then decreases.

Key words: inwheel motor; electromagneticthermal bidirectional coupling method; airgap length; depth of stator groove