Einrichtung zur elektrischen Pendelungsdämpfung von einer oder mehreren Drehfeldmaschinen

摘要

A circuit to dampen oscillations occurring in rotating field machines such as low friction hysteresis motor drives is disclosed. The circuit operates by detecting the frequency of oscillations occurring in the machines and regulating the frequency of the power fed to the motors to dampen the oscillations. The damping is produced by using a bandpass filter tuned to the frequency of the oscillations and subtracting this frequency from a predetermined frequency to thereby force the rotating stator field of the machines to track the oscillations of the machine's rotors.