Method of eliminating self oscillations of an induction motor powered from a frequency changer and means for effecting same

摘要

A method of eliminating self-oscillations of an induction motor powered from a thyristor frequency changer, differing from those known in the prior art in that it provides for forming a signal proportional to a first derivative of the low frequency component of the motor reactive current oscillations which signal is applied as a positive feedback, in sequence with a main control, signal to an output frequency control circuit of the thyristor frequency changer.