Precision motor control system for VCR using disturbance and velocity observer

A high performance VCR motor servo system is described. The system eliminates wow and flutter and improves control capacity. Specifically, a method of motor control composed of an acceleration controller and a sensor noise reduction system using disturbance and velocity observers has been developed. The results of this development are a reduction in wow-flutter of nearly 20 dB measured at the capstan motor and 10 dB measured at the drum motor. In addition, high band disturbance estimation using the velocity observer´s noise-reduction system permitted the design of a robust system using disturbance compensation