Stabilized non-linear servomechanism

Details Stabilized non-linear servomechanism Stabilized non-linear servomechanism

1979-05-14

1980-12-30

Dobeck, B.

Electricity: motive power systems

Positional servo systems

With stabilizing features

318617, 318618, G05B 602

Patent

active

042426227

ABSTRACT:
A servomechanism comprising an operational amplifier; a servomotor driven by the amplifier, the amplifier having limited output voltage and current capabilities, i.e. being non-linear; a position sensor; and a position error detector. A negative feedback circuit integrates the limited amplifier output and mixes it with the error signal so as to produce, in the output of the amplifier, a signal proportional in voltage-time product to a derivative of error, even when the output amplitude is limited. Therefore the servo is positioned in the minimum possible time commensurate with the limited capability of the amplifier, without overshoot or undershoot.
During an extended slew, the error signal output of the position error detector also becomes limited. Hence, shorting means are provided to prevent undue build-up of the integrated amplifier output feedback signal during this time, and to short a DC feedback blocking capacitor.

REFERENCES:
patent: 3648031 (1972-03-01), Neal
patent: 3805137 (1974-04-01), Fahrner
patent: 3820712 (1974-06-01), Oswald
patent: 4032132 (1977-06-01), Iftikar et al.

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