MOTOR DRIVING SERVO SYSTEM COMPRISING AN INTEGRATOR FOR THE QUANTITY RELATING TO THE ERROR SIGNAL

摘要

The servo system having a phase comparator for producing an error signal representative of the phase difference between an input reference periodic signal and an oscillatory signal for driving a motor. A voltage controlled oscillator controlled by the error signal to produce the oscillatory signal is provided with an integrator for integrating the error signal to produce an integration signal proportional to the result of the integration of the error signal and therefore to hold the instantaneous value of the integration signal when the error signal becomes zero. The integration signal is supplied to the oscillator in place of the error signal. the servo system is suitable for the drum and the capstan servos of rotary-head video tape recorders.