Active torsional vibration suppression for integrated electric drive system considering nonlinear factors

The problem of torque ripple of the motor and nonlinear excitation in the gear transmission system can exacerbate the torsional vibration of the integrated electric drive system, leading to a decrease for the electric drive system's reliability and the vehicle's comfort. This article establishes a nonlinear model for a permanent magnet synchronous motor and a gear transmission system, analyzes the effects of nonlinear factors such as time-varying mesh stiffness, gear backlash, and meshing error on the characteristics of the integrated electric drive system and proposes a torsional vibration suppression strategy based on a double-layer model predictive control. This strategy aims to suppress torsional vibration for the integrated electric drive system by controlling the motor's target torque and reducing current harmonics and torque ripple. The simulation and experimental results demonstrate that the control method proposed in this article effectively reduces motor torque ripple and current harmonics, diminishes torsional vibration for the integrated electric drive system, enhances the stability of the electric drive system, and improves vehicle comfort.