Capacitive angular position transducer

Details Capacitive angular position transducer Capacitive angular position transducer

G - Physics

08

C

340/135.2

G08C 19/10 (2006.01) G01B 7/30 (2006.01) G01D 5/241 (2006.01)

Patent

CA 1253233

CAPACITIVE ANGULAR POSITION TRANSDUCER ABSTRACT OF THE DISCLOSURE A transducer for sensing the angular position of a shaft over a limited angle (e.g., ?30°) uses a printed cir- cuit board mounted perpendicular to the shaft between capa- citor plates of a bifurcated vane clamped to the shaft. The board has two pairs of symmetrical capacitor plates, one pair on each side with each plate of a pair located symme- trically with respect to the midposition of the vane plates, and corresponding plates of each pair connected together at a junction to place the two corresponding variable capaci- tors in parallel. Circuit means produces a Mark-Space sig- nal proportional to the position of the bifurcated vane. Using the total Mark-Space period to continually derive a midposition reference, and comparing that midposition refer- ence to any deviation of equal Mark and Space periods pro- vides a position signal proportional to deviation from mid- position of the bifurcated vane. By offsetting the midposi- tion reference signal, the position output signal will be proportional to the position of the plates of the bifurcated vane with respect to the circuit board plates from one ex- treme to the other.

485096

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