Position and speed sensors

Details Position and speed sensors Position and speed sensors

1988-01-26

1989-08-01

Dobeck, Benjamin

Electricity: motive power systems

Positional servo systems

With particular 'error-detecting' means

318661, 336 75, G05B 106

Patent

active

048536040

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), Wecsung
patent: 2986714 (1961-05-01), Smith
patent: 3699558 (1972-01-01), 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
The Screened Inductance Sensor; A New Position and Speed Measurement System, Proc. Motorcon, vol. 10, Apr. 1987, Hannover, pp. 220-237, Byrne, McMullin & Murray.
Linear Motion Screened Inductance Sensors, Proc. Conf. on Applied Control, Jun. 1987, Minneapolis, Minn., U.S.A., pp. 120-129; Byrne, McMullin & Murray.

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