SYSTEM FOR CONTROLLING TORSIONAL VIBRATION OF MECHANICAL DRIVE SYSTEM

摘要

PURPOSE:To suppress torsional vibration of a mechanical shaft by detecting the torsional torque on the mechanical shaft and adding the motor torque a torque component for attenuating the torsional vibration. CONSTITUTION:A speed command signal n is coupled through a speed regulator 11, a current regulator 12 and a voltage regulator 13 to control a thyristor converter 14 for operating a motor M. At the same time, a mechanical shaft 16 coupling a motor M and a mechanical system 17 such as a rolling mill is detected by a detector 19, and the output thereof is differentiated through a differentiator 20 and coupled through a phase adjuster 21 and a gain adjuster 22 to a current regulator 12. Thus, the peak value of the torsional vibration can be reduced by producing the shaft torsional vibration attenuation torque from the motor itself, so that it is possible to increase the equivalent attenuation constant of the torsional vibration of the shaft and obtain quick attenuation.