Dynamic characteristics and experimental verification of planetary gear-motor coupling system under unsteady and non-ideal states

As the integral component of various high-end equipment, the dynamic characteristics of planetary gear-motor coupling system (PMCS) is susceptible to the influence of electrical or mechanical subsystems. Especially under complex non-steady state and non-ideal scenarios, the coupling mechanisms between the gear transmission system and the electrical system remain unclear. To address the challenging issue, this study comprehensively takes into account both the internal and external excitations of the mechanical transmission system, and established a planetary gear dynamic model that applicable to analyze the dynamic response under various unsteady conditions; Simultaneously, this study introduces the Rotor Flux Orientation Control (RFOC) algorithm, the Space Vector Pulse Width Modulation (SVPWM), as well as the three-phase asynchronous motor equivalent circuit model and inverter power supply model. Then established the comprehensive drive chain coupling model by combining with the former planetary gear models. The correctness of the model is verified by the simulation and experimental results of the PMCS under steady-state conditions. Thereafter, this study uncovers the vibration-current coupling mechanisms of the gear-motor system in non-steady-state conditions. Furthermore, the dynamic characteristics of the PMCS in non-ideal scenarios are investigated. This work also provides theoretical guidance for condition monitoring of the whole electromechanical systems.