Electricity: motive power systems – Positional servo systems – With stabilizing features
Patent
1978-06-16
1981-08-18
Truhe, J. V.
Electricity: motive power systems
Positional servo systems
With stabilizing features
318615, 318619, 318620, 318332, 318307, 91359, G05B 501
Patent
active
042849420
ABSTRACT:
Load actuating servomechanism apparatus includes dynamic regeneration and a mechanically damped motor-load coupling to equalize and overcome a frequency-varying load/load drive train mechanical resonance. The drive circuitry comprises a per se conventional primary motor speed controlling rate feedback loop including a cascaded rate signal command source, summing error-signal producing node, and loop frequency response shaping filter and driver amplifier for exciting a load driving motor, and a rate tachometer signal feedback element connecting a measure of the motor output speed to a subtractive input of the summing node.
To broaden the response band of the primary feedback circuit and accommodate a mechanical resonance otherwise interfering therewith, a secondary, positive feedback path supplements the input rate command with a signal dependent upon motor current, and thus upon motor load. Accordingly, output load drive automatically increases as motor current increases when a load drive retarding mechanical resonance is encountered. Further, the mechanical damping, for example implemented by a slip clutch, lowers the effective Q of the resonance, thereby facilitating load actuation.
REFERENCES:
patent: 2472271 (1949-06-01), Yardeny
patent: 3464318 (1969-09-01), Thayer et al.
patent: 3660744 (1972-05-01), Plummer
patent: 3665278 (1972-05-01), Kazmarek
patent: 3808486 (1974-04-01), Cuda et al.
patent: 3826961 (1974-07-01), Hayase et al.
Bigley William J.
Rizzo Vincent J.
Indyk Eugene S.
Judlowe Stephen B.
Lockheed Electronics Co., Inc.
Truhe J. V.
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