Research on electromechanical coupling dynamics of switched reluctance motor-planetary gear electric drive system

The Switched Reluctance Motor (SRM)-planetary gear electric drive system shows significant application potential, but its dynamic characteristics are severely impacted by strong nonlinear factors and electromechanical coupling effects. This study established an electromechanical coupling dynamic model of the SRM electric drive system, using translational and angular displacements as generalized coordinates, to investigate the system’s internal/external excitations and nonlinear factors. The model comprehensively considers factors such as core magnetic saturation, the spatio-temporal distribution of electromagnetic forces, component flexibility, and installation errors. To verify the model’s accuracy, an experimental test rig was constructed. A comparison of phase currents and vibration accelerations under steady-state conditions confirmed that the simulation and experimental results exhibit good consistency. Through simulation, key internal factors that are difficult to isolate experimentally, such as motor torque ripple, rotor eccentricity, gear errors, and housing flexibility were analyzed, revealing their influence mechanisms. To further ascertain the system’s response characteristics under real-world dynamic operating conditions, the vibration response laws under different external operating conditions of input speed and load torque were explored through experiments. This research, integrating simulation and experimentation, clarifies the influence mechanisms of internal factors and external conditions on the system’s dynamic characteristics, providing a basis for resonance avoidance and optimal design.