William J Bigley

US Patent:

42849420, Aug 18, 1981

Filed:

Jun 16, 1978

Appl. No.:

5/916138

Inventors:

William J. Bigley - Scotch Plains NJ
Vincent J. Rizzo - Basking Ridge NJ

Assignee:

Lockheed Electronics Co., Inc. - Plainfield NJ

International Classification:

G05B 501

US Classification:

318618

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.

US Patent:

42950813, Oct 13, 1981

Filed:

Jan 6, 1978

Appl. No.:

5/866394

Inventors:

William J. Bigley - Scotch Plains NJ
Vincent J. Rizzo - Basking Ridge NJ

Assignee:

Lockheed Electronics Co., Inc. - Plainfield NJ

International Classification:

H02P 500

US Classification:

318327

Abstract:

Load actuating servomechanism apparatus includes dynamic regeneration 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.