Load actuating servomechanism with resonance equalization

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

H - Electricity

02

P

318/108

H02P 5/00 (2006.01) G05B 5/01 (2006.01) H02P 23/00 (2006.01)

Patent

CA 1124784

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.

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