Two-wire position-to-D.C. current transducer

Electricity: motive power systems – Positional servo systems – With particular 'error-detecting' means

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318676, G05B 106

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active

039566820

ABSTRACT:
A two-wire transmitter for converting a motion input into a D.C. milliampere output signal that varies linearly with the angular rotation of a mechanical arm. The transmitter employs a position balance principle accomplished by reflecting a light beam from a light emitting diode against a mirror of a D'Arsonval movement upon a dual element photocell. Movement of the input arm displaces the light beam to unbalance a bridge circuit, the increase voltage thereof increasing the current in an output loop which is fed back through the D'Arsonval motor coil. Rotation of the coil rotates the mirror to swing the light beam toward the center of the photocell and rebalance the system to meet new input conditions.

REFERENCES:
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patent: 3128429 (1964-04-01), Pattee
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patent: 3213694 (1965-10-01), Clark et al.
patent: 3277367 (1966-10-01), Petersen
patent: 3450969 (1969-06-01), Sato et al.
patent: 3465221 (1969-09-01), Arce et al.
patent: 3581181 (1971-05-01), Wallace
patent: 3767992 (1973-10-01), Edwards et al.
patent: 3770890 (1973-11-01), Winkler
patent: 3868556 (1975-02-01), Lesure

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