Load actuating servomechanism with resonance equalization

Details Load actuating servomechanism with resonance equalization Load actuating servomechanism with resonance equalization

1978-01-06

1981-10-13

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318618, 318448, H02P 500

Patent

active

042950813

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.

REFERENCES:
Reed, J. W., "Access-Control System with Reduced Velocity Error", IBM Tech. Disc. Bull., vol. 19, No. 5, Oct-76, p. 1884.
Gottlieb, I. M., Electronic Motors and Motor Control Technique, Howard W. Sams & Co., 1976, pp. 117-119.

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