Inductive position sensor

G - Physics – 01 – D

Patent

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Details

G01D 5/22 (2006.01) B60K 26/00 (2006.01) G05D 13/62 (2006.01)

Patent

CA 2561270

An inductive position sensor for position sensing 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. For example, the coupler element may rotate about a common central axis of the transmitter coil and receiving coil. In further examples, a reference coil is configured so that a provided reference signal is substantially insensitive to variations in the angular position of the coupler element. A ratio between the receiver signal and the reference signal is sensitive to the coupler element position, but substantially insensitive to common mode factors that influence the reference signal and receiver signal to a substantially equal degree.

Selon l'invention, un capteur de position inductif permettant de détecter une position comprend une bobine émettrice et une bobine réceptrice, la bobine réceptrice générant un signal de réception lorsque la bobine émettrice est excitée par une source de courant alternatif. Un élément de couplage mobile modifie le couplage inductif entre la bobine émettrice et la bobine réceptrice de sorte que le signal de réception est sensible à la position de l'élément de couplage. Par exemple, l'élément de couplage peut tourner autour d'un axe central commun de la bobine émettrice et de la bobine réceptrice. Dans d'autres exemples, une bobine de référence est conçue de sorte qu'un signal de référence fourni est pratiquement insensible à des variations au niveau de la position angulaire de l'élément de couplage. Un rapport entre le signal de réception et le signal de référence est sensible à la position de l'élément de couplage, mais pratiquement insensible à des facteurs de mode commun qui influencent le signal de référence et le signal de réception selon un degré pratiquement égal.

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