Based on the finite element method and the lumped heat network method, the temperature rise model of the motor is established, and the transient temperature rise of the motor is simulated. In view of the variety and complexity of the model parameters of motor temperature rise, the electromagnetic parameters and thermal parameters of motor are systematically studied from the perspective of loss distribution and heat transfer. According to the structural parameters of the motor, the physical model is established. The leakage inductance parameters are modified by electromagnetic simulation and analytical calculation. The heat transfer coefficients of the end and the shell are calculated. The air gap convection coefficients of the stator and rotor are treated equivalently. The temperature rise is calculated by the magnetothermal coupling method. By comparing the temperature rise of the main parts of the motor through experiment and simulation, the accuracy of motor parameters calculation is verified.