Abstract:

Taking into account of factors such as core magnetic saturation， torque fluctuation， and component flexibility， an electromechanical coupling dynamic model for the switched reluctance motor-planetary gear electric drive system suitable for unsteady state conditions is established， with translational and angular displacements as generalized coordinates， which is validated through experiments. Through simulation analysis， the dynamic characteristics of the system under acceleration and variable load conditions are studied. The results show that under acceleration conditions， the speed at which the electric drive system is most prone to resonance is 3 900 r/min， at which multiple excitation frequencies cross the natural frequency of the system. Among them， the vibration energy generated by the excitation of the 15th order natural frequency at the gear mesh frequency is the largest， and the vibration energy is mainly concentrated in the θ_y direction of the planet carrier. At the moment of sudden load change， the system produces low-order free vibration dominated by the 5th order natural frequency， with vibration energy mainly concentrated in the θ_{xand θy directions of the inner gear ring and gear housing.}

Key words: electric drive system, switched reluctance motor, planetary gear transmission, electromechanical coupling, dynamics analysis