Inductive position sensor with common mode corrective...

G - Physics – 01 – D

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G01D 5/20 (2006.01) G05G 1/14 (2006.01) G05G 1/28 (2006.01)

Patent

CA 2604049

An inductive position sensor for rotary motion includes a transmitter coil and a receiver coil, the receiver coil generating a receiver signal when the transmitter coil is excited by an alternating current source. A moveable coupler element modifies the inductive coupling between the transmitter coil and the receiver coil so that the receiver signal is sensitive to the coupler element position. The ratio between the receiver signal and the reference signal is sensitive to the coupler element position, but substantially insensitive to common mode factors. The angular or positional range of the position sensor can be increased using a plurality of receiver coils.

La présente invention concerne un détecteur de position inductif pour un mouvement rotatif, lequel détecteur comprend une bobine émettrice et une bobine réceptrice; la bobine récepteur générant un signal récepteur lors que la bobine émettrice est excitée par une source de courant alternatif. Un élément coupleur amovible modifie le couplage inductif entre la bobine émettrice et la bobine réceptrice de telle sorte que le signal récepteur réagit à la position de l'élément coupleur. Le rapport entre le signal récepteur et le signal de référence dépend de la position de l'élément coupleur, mais il est substantiellement insensible aux facteurs de mode commun. La portée angulaire ou positionnelle du détecteur de position peut être augmentée au moyen de bobines réceptrices.

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