Evaluation of the Digital Prediction Filter Applied to Control a Class of Servomotor by Microcomputers

The application of the primary discrete prediction filter to the feedback in the control system of NC servomotor by the microcomputer, is evaluated. The minimum sampling time permissive is 3 msec for the velocity control and 12 msec for the position control. The contribution of the prediction in the velocity loop is seen. The prediction in the position loop is useful. The larger velocity gain is permitted when the prediction coefficient in the velocity loop is approximately 0.82. The larger velocity gain causes the greater immunity from the torque disturbance.