Position and speed sensors

Details Position and speed sensors Position and speed sensors

1985-10-18

1988-04-12

Dobeck, Benjamin

Electricity: motive power systems

Positional servo systems

With particular 'error-detecting' means

318661, 318687, 336 75, 336 79, G05B 106

Patent

active

047376988

ABSTRACT:
In a sensor having a drive winding for establishing a forward field, an electrically conductive screen is displaceable relative to a sense winding. In the presence of the drive field, eddy currents are generated in the screen to establish a counter-field opposing the forward field, so that the sense winding is shaded by the screen to a varying extent during relative displacement of screen and sense winding and the voltage induced in the sense winding is accordingly correspondingly varied. Application of a high frequency input to the drive winding results in a modulated output from the sense winding which may be demodulated to provide a signal indicative of screen position relative to sense winding. The position signal may be further processed to provide a speed signal. The sensor may assume a multiplicity of linear or planar, rotational and axial or solenoidal configurations.

REFERENCES:
patent: 2145742 (1939-01-01), Wechsung
patent: 2986714 (1961-05-01), Smith
patent: 3699558 (1972-10-01), Hendley et al.
patent: 4039929 (1977-08-01), Weckenmann
patent: 4080592 (1978-03-01), Zabler
patent: 4236093 (1980-11-01), Birnbaum
patent: 4425511 (1984-01-01), Brosh
patent: 4507638 (1985-03-01), Brosh
Awaiting Publication--The Screened Inductance Sensor: Design Methods for Printed Circuit Windings.

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