| 摘要 |
PURPOSE:To suppress resonance of torque transmission mechanism with its inherent frequency by extracting the ripple component or a DC power source caused by the inherent vibration on the side of the torque transmission mechanism, then leading the phase of the ripple component and lapping the ripple component over a slip frequency command. CONSTITUTION:When the voltage across a filter capacitor 3 vibrates with the inherent frequency of a torque transmission mechanism of about 10Hz, a voltage signal(Efc) to be fed from a voltage detector 14 to a low-pass filter 18 also vibrates and the vibration frequency Efc1 thereof is fed to a differentiation compensator 19. The output (fsefc) at the differentiation compensator 19 has such phase as leading by 90 deg. from the Efc. Since the (fsef) operates with 90 deg. leading phase, meter current (im) varies with approximately the same phase as the (fsefc) when the Efc increases. By such arrangement, voltage across the filter capacitor 3 is suppressed. |
