Position encoder

G - Physics – 01 – D

Patent

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Details

G01D 5/20 (2006.01) G01F 1/24 (2006.01) G01F 23/30 (2006.01)

Patent

CA 2189959

In a linear position encoder, a support is provided upon which a pair of phase quadrature windings (13 and 15) are mounted. The windings are arranged to have a sinusoidal magnetic sensitivity characteristic along the length of the support (5). Mounted on a movable element (not shown) there is a resonant circuit (10) comprising a coil (14) and capacitor (17) that can magnetically couple with the windings (13 and 15). When the circuit (10) is excited it induces currents in the windings (13 and 15) that are dependent upon the position of the circuit (10) within a period Ts of the windings (13 and 15). An excitation and processing unit (11) is provided to energise the circuit (10) and to process the signals induced in the windings (13 and 15). The encoder may in a variation, measure rotational or radial position instead of translation.

L'invention concerne un codeur de position linéaire doté d'un support sur lequel on a monté une paire d'enroulements (13 et 15) de quadrature de phases. Ces enroulements sont conçus pour posséder une caractéristique de sensibilité magnétique sinusoïdale sur toute la longueur du support (5). On a monté sur un élément mobile (non montré) un circuit résonant (10) comprenant une bobine (14) ainsi qu'un condensateur (17) susceptible de se coupler de façon magnétique avec les enroulements (13 et 15). Lorsque le circuit (10) est excité, il induit des courants dans les enroulements (13 et 15) qui dépendent de sa position à l'intérieur d'une période T¿s? des enroulements (13 et 15). On a prévu une unité (11) d'excitation et de traitement afin d'exciter le circuit (10) et de traiter les signaux induits dans les enroulements (13 et 15). Ce codeur peut, dans un autre mode de réalisation, mesurer la position rotative ou radiale au lieu du mouvement de translation.

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