High speed position feedback and comparator system

Electricity: motive power systems – Positional servo systems – Frequency- or phase-modulated systems

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Details

318603, 318661, G05B 101

Patent

active

042824680

ABSTRACT:
A positioning system is provided in which command and feedback signals are processed to develop an analog error signal for application to a servo drive to position a controlled element. The command signals are in the form of pulses each of which corresponds to a certain incremental distance of movement. The feedback signals are developed from phase shifts of a low frequency resolver signal, such phase shifts being proportional to movement of the element. Such feedback signals are applied to a resolver digitizer circuit which develops a train of resolver pulses in response to the phase shift represented by each feedback signal. Each such resolver pulse corresponds to the same incremental distance of movement as a command pulse and both the resolver pulses and the command pulses are applied to a comparator and error signal circuit in which any cumulative error in either direction is stored as a digital number and is converted to an analog error signal of the proper polarity. The system effects accurate positioning of an element while accommodating a large temporary following error and thereby allowing movement at high speeds in response to high command pulse frequencies.

REFERENCES:
patent: 3079522 (1963-02-01), McGarret
patent: 3490017 (1970-01-01), Kolell
patent: 3539895 (1970-11-01), McGee
patent: 3562619 (1971-02-01), Hyoguchi et al.
patent: 3614575 (1971-10-01), Cutler
patent: 3670324 (1972-06-01), Trevor
patent: 3786333 (1974-01-01), Sommeria
patent: 4021714 (1977-05-01), Jones
patent: 4164693 (1979-08-01), Leenhouts

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