Electricity: motive power systems – Positional servo systems – Digital or numerical systems
Patent
1978-10-03
1982-09-21
Smith, Jr., David
Electricity: motive power systems
Positional servo systems
Digital or numerical systems
318615, 318618, 318634, G05B 102, G05B 103
Patent
active
043509401
ABSTRACT:
A separately excited D.C. motor employs an analog servo control responsive to a speed control input signal that controls the derivation of a compensating signal for the motor back emf. The speed control and compensating signals are combined to control the motor speed via an analog regulator. A digital shaft encoder responsive to the motor position supplies a pulsed signal to a comparator that is also responsive to a desired position signal that is derived from the speed control signal. The comparator derives an integrated error signal that is supplied to the analog regulator. Application of the speed control signal to the regulator is delayed if a thermal simulator for the motor characteristics indicates motor overheating. In response to the compensated, desired speed indicating signal indicating that the motor has been ordered to stop, the error signal is decoupled from the analog regulator. The integrated error signal is reduced to zero if the compensated desired speed indicating signal indicates either a theoretical halt of the motor capstan, or a high speed instruction. The error signal remains briefly at zero if the compensated desired speed indicating signal orders a start cycle.
REFERENCES:
patent: 3185364 (1965-05-01), Kleist
patent: 3559018 (1971-01-01), Fournier
patent: 3614569 (1971-10-01), Reinert
patent: 3648191 (1972-03-01), Scheer
patent: 3706020 (1972-12-01), Klang
patent: 3731176 (1973-05-01), Mitchell et al.
patent: 3828168 (1974-08-01), O'Callaghan
patent: 3860861 (1975-01-01), Gucker
patent: 3953774 (1976-04-01), Sato et al.
Compagnie Internationale pour l'Informatique -CII-Honeywell Bull
Smith Jr. David
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