System for converting mechanical movement to a digital signal

Details System for converting mechanical movement to a digital signal System for converting mechanical movement to a digital signal

1983-09-08

1985-07-02

Krawczewicz, Stanley T.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

340347CC, 340347SY, 318661, H03K 1302, G05B 103

Patent

active

045271208

ABSTRACT:
A system for converting mechanical movement of a body under detection to a digital signal comprises a synchro generator having a primary and a secondary windings movable relative to each other, one of the windings capable of being coupled to said body, an exciting circuit for providing multiple-phase exciting currents to the primary winding at a frequency higher than the frequency corresponding to the maximum speed of the body, and a phase-locked-loop control circuit responsive to the output of the secondary winding for generating a frequency-multiplied digital signal at a frequency equal to the product of the frequency of an AC signal induced in the secondary winding and a predetermined factor.

REFERENCES:
patent: 3284795 (1966-11-01), Fertig
patent: 3634838 (1972-01-01), Granqvist
patent: 3914760 (1975-10-01), Logue
patent: 4023085 (1977-05-01), Bishop
patent: 4286203 (1981-08-01), Ehret
patent: 4321684 (1982-03-01), Sommeria
Grebene, "The Monolithic PLL, A Versatile Building Block", IEEE Spectrum-Mar. 1971, pp. 38-49.
Dewan, "Slip Speed Control in an Induction Motor Drive with a PLL"-Canadian Elec. Journal-1980.
Analog Devices-"Low Profile Synchro to Digital Converters-SDC 1700 Series", Data Acquisition Products Catalog Supplement, 1979, pp. 277S-282S.
Lavan, "Resolvers & Synchros"-Electromechanical Design, Jan. 1965-pp. 117-138.
Verfahren zur Wegmessung mit Inductosyn, by A. Signer et al., Wekstatt und Betrieb, 1975, Bd. 108, (pp. 507-513).

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