Abstract: A velocity control system for a motor is provided wherein first counter means are reset by feedback pulses from the motor to record the feedback period. Decode means responsive to the first counter means determines whether the feedback period is long or short and the status of this is put into storage means. An up-down counter is responsive to the storage means for adjusting the motor drive pulse width and second counter means are reset by the motor feedback pulses to terminate the drive to the motor. Comparing means are responsive to the up-down counter and said second counter means for controlling the motor drive to maintain a precise motor velocity.
Type:
Grant
Filed:
December 19, 1974
Date of Patent:
April 13, 1976
Assignee:
International Business Machines Corporation