Abstract：Aiming at the interaction mechanism between the dynamic response of electromechanical system and the change of electrical parameters, the time-varying meshing and bearing stiffness at the sun wheel were expressed as the function of rotation angle, and a motor-gear electromechanical coupling model suitable for different speed conditions is established. The relationship between dynamic characteristics of mechanical system and stator current of motor is deduced by using dq-axis transformation method. Based on the precise electromechanical coupling model, the frequency characteristics of vibration response and stator current response were calculated, and the mapping rule of meshing frequency and bearing frequency in stator current was revealed. The results show that the stator current frequency is modulated by the frequency of the mechanical part to generate the corresponding side frequency, which can be used to judge the operation of the mechanical system. The meshing frequency and its doubling frequency are directly modulated with the current frequency and reflected in the current spectrum. The bearing frequency is first convolved with the meshing frequency and then modulated with the current frequency. Under different speeds, the characteristic frequency deviation of gears and bearings can also be reflected in the current frequency domain.
Key words: motor-gear system; electromechanical coupling; dynamic characteristics; stator current feature analysis
肖正明，刘佳伟，谭加林，郑胜予. 行星齿轮机电耦合动力学及其电参数影响机理研究[J]. 振动与冲击, 2022, 41(20): 78-85.
XIAO Zhengming，LIU Jiawei，TAN Jialin，ZHENG Shengyu. A study on mechanical and electrical coupling dynamics of planetary gears and its influence mechanism of electrical parameters. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(20): 78-85.
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