Integrated electric drive systems are characterized by high power density,
reliability, and controllability, making them increasingly prevalent in the
realm of electric commercial vehicles. However, the direct coupling between the
motor shaft and the transmission system has introduced a series of undesirable
torsional vibration phenomena. To investigate the dynamic characteristics of
electric drive systems in operation for electric commercial vehicles, a
comprehensive modeling approach is employed. This modeling framework takes into
account key factors such as gear backlash, structural flexibility, and
electromagnetic spatiotemporal excitations. Based on this model, the influence
of the electrical system on time-varying gear mesh stiffness, gear transmission
error, bearing forces, and other factors is investigated. Building upon this
foundation, the article proposes an approach for active harmonic voltage
injection. This method effectively reduces torque fluctuations, decreases the
amplitude and fluctuation of gear mesh stiffness and gear transmission error,
lowers the vibration accelerations of each shaft, and enhances the reliability
of the integrated electric drive system.
