EFFECT OF ROTOR VIBRATION OF TRACTION MOTOR ON DYNAMIC BEHAVIOR OF HIGH SPEED TRAIN

In order to analyze the vehicle dynamic behavior caused by the rotor vibration of traction motor, a non-linear dynamic model of the motor car including the driving system is established, and the nonlinear reaction force of the rotor-bearing system is considered in the model. Through numerical simulation, the vibration of traction motor caused by the nonlinear force of rotor-bearing system is studied. The dynamic behavior of the vehicle under traction under constant speed and idle running conditions is analyzed. Two cases are compared: with or without taking into account the rotor-bearing nonlinear reaction force. The results show that the vibrations of motor rotor are induced by the bearing vibrations with variable stiffness frequencies and their sub-harmonic frequencies. The bearing reaction force has larger influence on the vertical and longitudinal high frequency vibrations of traction motor, bogie frame and wheelset, and less influence on their lateral vibration and the carbody vibration. When the rotor structure is eccentric, this influence is more serious.