电驱动系统再生制动工况动力学特性研究

In order to study the dynamic characteristics of electric vehicle drive system in the regenerative braking process, the tire torsion characteristics are further coupled on the basis of considering static transmission error, backlash and time-varying meshing stiffness and the electromechanical coupling model of permanent magnet synchronous motor-two stage transmission mechanism-tire is established and verified by experiments. The influence of tire torsional characteristics and regenerative braking torque on the dynamics of the electric drive system is analyzed. The results show that the tire torsional characteristics introduce a new mode into the electric drive system, which changes the first-order mode of the system. Gear continuous impact events of the transmission mechanism occur when the regenerative braking torque is small, and with the increase of regenerative braking torque, the impact events gradually disappear, but the dynamic load of the transmission mechanism increases when the electromagnetic torque is reversed. The research provides theoretical support for dynamic load study and life prediction of the electric drive system.