Device for detecting the position of a moveable magnet for...

Details Device for detecting the position of a moveable magnet for... Device for detecting the position of a moveable magnet for...

G - Physics

01

D

G01D 5/12 (2006.01) F15B 15/28 (2006.01) G01B 7/02 (2006.01)

Patent

CA 2283209

The invention relates to a device for detecting the position of a magnet which is positioned so that it is moveable (3, 23, 24) to produce a magnetic field (6) through a ferromagnetic wall (1, 29), a magnetic field sensor (10, 21, 21') being situated in front of said wall. When said magnet (3. 23, 24) is moved in relation to said wall (1), the lines (6) of the field build up a useful flux (6) which progresses in said wall (1, 29). Said useful flux has magnetic remanence (7) which is retained after the magnet (3, 23, 24) has passed by, is aligned along the movement axis of the magnet (3, 23, 24) in accordance with the polarity, and builds up a fringing flux (12) to the front side of the wall (1.29) where the magnetic field sensor (10, 21, 21') is positioned. Outside of said wall, the fringing flux (12) is opposed and is aligned with the useful flux (6). The magnetic field sensor is a magnetic field sensor element (10, 21, 21') located at a short distance from the wall (1, 29) and detects the field direction of the fringing flux (12); when the magnet (3, 23, 24) passes by, the fringing flux is superposed by the field (6) of the magnet (3. 23. 24). The magnetic field sensor (10, 21. 21') registers the change of field, which is then used to produce a switching signal.

Dispositif permettant de détecter la position d'un aimant (3, 23, 24) mobile destiné à produire un champ magnétique (6) dans une paroi ferromagnétique (1, 29) devant laquelle se trouve un détecteur (10, 21, 21') de champ magnétique. Lors du mouvement de l'aimant (3, 23, 24) par rapport à la paroi (1), les lignes (6) du champ produisent un flux principal qui progresse dans la paroi (1, 29). Ledit flux possède une rémanence (7) magnétique qui reste après le passage de l'aimant (3, 23, 24), est dirigée le long de l'axe de mouvement de l'aimant (3, 23, 24) en correspondance avec la polarité, et produit un flux de dispersion (12) sur la face avant de la paroi (1, 29) devant laquelle est placée le détecteur (10, 21, 21') de champ magnétique, le flux de dispersion (12) étant aligné avec le flux principal en direction opposée, à l'extérieur de la paroi (1, 29). Le détecteur de champ magnétique est un élément (10, 21, 21') qui est placé à faible distance de la paroi (1, 29) et qui détecte la direction de champ du flux de dispersion (12). En cas de passage de l'aimant (3, 23, 24), le champ (6) de l'aimant se superpose au champ de dispersion et le détecteur (10, 21, 21') de champ magnétique enregistre la modification du champ qui est ensuite utilisée pour produire un signal de commutation.

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