Voltage differential negative feedback circuit

After adding a negative feedback circuit , oscillation is likely to occur due to the inertia of the adjustment object and the measurement feedback link. For this purpose, a
voltage differential or speed differential circuit is used to reduce or eliminate oscillation, which acts as a dynamic correction.
    The circuit aULk] is shown in 16-34. The voltage reflecting the change in motor speed is taken out from the potentiometer RPi and sent to the input end of the transistor VT amplifier through the voltage differential circuit
composed of RP2 and C , thereby changing the conduction angle of the thyristor to reduce the change in motor speed.