Capacitive position sensor

Details Capacitive position sensor Capacitive position sensor

1991-04-08

1991-12-31

Griffin, Donald A.

Electricity: electrical systems and devices

Electrostatic capacitors

Variable

318662, 324725, H01G 501, H02P 100, G01R 2726

Patent

active

050776355

ABSTRACT:
A capacitive position sensor includes a capacitor arrangement assembled of a stator (5) and a rotor (6). The stator supports at least three coplanar electrodes (21, 22, 23) having the shape of circle sectors 120.degree.. The rotor supports at least a counterelectrode (25) having the shape of a circle sector of 240.degree.. An oscillator (30) applies two a.c. voltage (u1, u2) of equal amplitude and opposite phase to two of the stator electrode (21, 22). The range of rotation of the rotor is such that the remaining third electrode on the stator is always overlapped by the counterelectrode. Voltage induced on the counterelectrode by means of the a.c. voltages on the stator electrodes is inverted and fed back as a neutralizing voltage (uR) to the third stator electrode (23) until the induced voltage on the counterelectrode reaches zero value. The neutralizing voltage is rectified and integrated into a d.c. voltage (UA) which serves as a measure of the angular position of the rotor (6).

REFERENCES:
patent: 3760392 (1973-09-01), Stich
patent: 4142144 (1979-02-01), Rohr
patent: 4463299 (1984-07-01), Langley et al.
patent: 4999734 (1991-03-01), Smith

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