Electromechanical coupling dynamic responses of motor-gear system under different motor control methods

The integration of a motor-gear system (MGS) can introduce complex electromechanical coupling dynamics issues. For example, mechanical vibrations within the gear transmission system (GTS) may cause deviations in the actual output power of motor, while torque fluctuations of motor can lead to significant impacts and vibrations during gear meshing. Consequently, this paper primarily addresses abnormal vibrations resulting from electromechanical coupling in MGS and investigates methods for their suppression. The objective is to examine the effect of various motor control techniques on the dynamics of MGS. Initially, a universal modeling approach for MGS, adaptable to different engineering scenarios with simple modifications to gear or motor parameters, is developed. This model includes the equivalent circuit model of the permanent magnet synchronous motor (PMSM), mathematical model of the motor rotor, and bending-torsion coupling model of the GTS. Coupling channels are established between these local models, facilitating the construction of a comprehensive electromechanical coupling dynamic model of MGS. The efficacy of this proposed model is validated through experimentation. Subsequently, different motor control techniques based on this model to assess their effects on the dynamics of both motor and GTS are analyzed. The results suggest that, without altering the mechanical structure of system, the dynamic behaviors of MGS can be improved through the implementation of motor control strategies. This approach aids in mitigating the exacerbation of abnormal vibrations within the MGS.