Shafts Torsional Vibration Between Traction Motor And Bogie Of High-speed Train

High-speed train’s traction drive system is a typical electromechanical coupling system. The ripple of torque would increase the vibration of the mechanism, which would shorten service life even have effect on operation security of the high-speed tain. The thesis pays attention to the eletromechanical coupling phenomenon, and analyzes the mechanism and reason of the phenomenon, then come up with a resonalble and effective strategy to decrease the effect of the phenomenon. First, the thesis analyzes the motor current and torque ripple considering the nolinear of inverter IGBT’s dead-time. Through the analysis the author finds that there is a lot of harmonic component which is six times of the frequency of the motor current. This torque harmonic component is in directly proportion to the dead-time. Meanwhile according to the parameter of real tain the author establishes the simulation model to confirm the result of the analysis. Second, based on the analysis of the traction drive system mechanical structure the thesis put forward the lumped mass model to analyze the nature vibration frequency of torsional vibration and bending-torsion coupled vibration of structure. At the same time the author builds the SimMechanics model to verify the result. Thirdly, the thesis analyzes the forced vibration of the mechanical structure when it is excited by the motor torque ripple. Then the author completes the electromechanical coupled vibration simulation according to the traction characteristic curve of the train. The result shows that the vibration would be increased when the frequency of the torque ripple is in accord with the natural vibration frequency. The degree of increased vibration is relatated to the structure of system and dead time of the invertor. Fourthly on the basis of the electromechanical coupled vibration, the author uses the dead time compensation strategy base on the error voltage to decrease the torque ripple which is6time of the motor current frequency. Through this strategy to reduce the vibration is efficient. Finally, the author tests train’s nature vibration frequency of mechanical structure. The result confirms the theoretical and simulation analysis. Simultaneously the author constructs the1.1kW experimental platform in laboratory to represente the electromechanical coupled vibration and verify the vibration restrain strategy.