Rotational speed control circuit - comprises integrating RC elements which are connected to negative feedback facility to avoid hunting

摘要

The speed control circuit is partic. an integrated speed controller with a keyed output signal e.g. Siemens type TCA-955. The output signal from the speed control circuit is fed to an integration element, specif. an RC network, and between this integration element and the true value, or control point, integration element, specif. an RC network, is connected a negative feedback circuit element. The output signal finally obtained from the switching stage of the circuit is not used directly to control the (rotational) speed of an electric motor, but is fed into an integration element where, to suppress hunting tendencies, part of the follow up signal is fed, via the feedback element, to the true value or control point integration element, where the signal obtained is then amplified and fed to the motor.