Investigation on Vibro-Impacts of Electric Powertrain in Regenerative Braking Process

Due to gear backlashes of electric powertrain drivelines, vibro-impacts between gear teeth easily cause severe noise and vibration problems. To analyze the vibro-impacts of powertrain excited by regenerative braking, a dynamic model of an electric drive multistage gear system is established. This model considers the permanent magnet motor electromagnetic characteristics and the gearbox translational-rotational vibration. The results show the relationship between the relative deformation of the gear teeth and the relative velocity. The phenomena of multiple impacts and rebounds of the gear teeth in each impact are revealed. The transient impact forces of the bearing and multistage gear are compared and analyzed. The research provides theoretical support for the dynamic load study of the electric powertrain.