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%x 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.

The strict operational condition of driving motors for vehicles propels the development of more complicated configurations in pure electric vehicles (PEVs). Multi-power-source powertrain configurations are one of the efficient technologies to reduce the manufacturing difficulty of driving motors. However, most of the existing studies are predominantly focused on optimal designs of powertrains and power distribution between the engine and motor of hybrid electric vehicles, which are not appropriate for PEVs. This paper proposes a novel dual-motor coupling-propulsion powertrain system that improves the dynamic and economic performance of the powertrain system in PEVs. The proposed powertrain system can realize both the single-motor driving mode and dual-motor coupling driving mode. The driving modes are divided and a power distribution strategy for the different driving modes based on an optimal system efficiency rule is employed, which enhances the performance of the proposed system. Further, a mode-switching strategy that ensures driving comfort by preventing jerk during mode switching is incorporated into the system. The results of comparative evaluations that were conducted using a dual-motor electric vehicle model implemented in MATLAB/Simulink, indicate that the mileage and dynamic performance of the proposed powertrain system are significantly better than those of the traditional single-motor powertrain system.