Rotational direction and angle detecting apparatus

Details Rotational direction and angle detecting apparatus Rotational direction and angle detecting apparatus

1982-03-03

1985-06-11

Gill, James J.

Communications: electrical

Continuously variable indicating

With particular transmitter

G08C 1910

Patent

active

045231958

ABSTRACT:
A rotational direction and angle detecting apparatus includes a stationary plate having first and second electrodes and a rotatable plate having third and fourth electrodes. Rectangular wave signals of opposite phases are applied to the first and second electrodes of the stationary plate. The third electrode of the rotatable plate has first and second auxiliary electrodes and the fourth electrode has third and fourth auxiliary electrodes. The first and second auxiliary electrodes and the third and fourth auxiliary electrodes are in opposed relation to the first and second electrodes respectively. With rotation of the rotatable plate, the capacitance values formed between the first and second auxiliary electrode and the first electrode and between the third and fourth auxiliary electrode and the second electrode are changed respectively. In accordance with the change of the capacitance, first and second rotation signal generator circuits produce first and second rotation signals respectively, which are logically computed by a logic operational circuit. A rotational angle is digitally displayed by a digital display unit according to the result of the logic computation.

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