Study on Electromechanical Coupling Characteristics of an Integrated Electric Drive System for Electric Vehicle

In order to investigate the electromechanical coupling characteristics of the integrated electric drive system (IEDS) that consists of a surface-mounted permanent magnet synchronous motor (SPMSM) and a helical gear reducer, a transient dynamic model including the motor model and the driveline dynamic model is established. Based on this model, the interaction between the mechanical system and the electrical system of IEDS for electric vehicle is simulated and analyzed. To suppress the dynamic load of IEDS mechanical components caused by the sudden step electromagnetic torque during rapid acceleration, an active damping control strategy (ADCS) is proposed. With the effect of ADCS, the maximum mesh force and displacement of IEDS gear pair have reduced by 23.26% and 26.96% respectively, the maximum dynamic load of motor shaft and IEDS output shaft have reduced by 28.75% and 29.05% respectively. The simulation results indicate that ADCS could effectively suppress the driveline torsional vibration during rapid acceleration.