Sensor for the detection of the directon of a magnetic field

G - Physics – 01 – R

Patent

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Details

G01R 33/07 (2006.01) G01D 5/12 (2006.01) H02K 29/08 (2006.01)

Patent

CA 2355682

A sensor for the detection of the direction of a magnetic field comprises one single magnetic field concentrator having a generally flat shape and at least a first horizontal Hall-effect element and a second horizontal Hall- effect element, whereby the Hall-effect elements are positioned near a peripheral edge of the magnetic field concentrator. Within its environment, the magnetic field concentrator alters the course of the field lines of the magnetic field and, in particular, has the effect that the field lines which, in the absence of the magnetic field concentrator would run parallel to the surface of the Hall-effect elements penetrate the Hall-effect elements almost vertically to their surface. Instead of horizontal Hall-effect elements, vertical Hall-effect elements can also be used when they are arranged beside the magnetic field concentrator. The sensor is particularly suitable as an angle sensor.

L'invention concerne un capteur pour déceler la direction d'un champ magnétique, qui comprend un seul concentrateur de champ magnétique à forme généralement plate et au moins un premier élément à effet Hall et un deuxième élément à effet Hall horizontal. Les éléments à effet Hall sont placés près d'une extrémité périphérique du concentrateur de champ magnétique. Dans son environnement, le concentrateur de champ magnétique modifie le cours des lignes de champ du champ magnétique et, en particulier, fait en sorte que les lignes de champ qui, en l'absence du concentrateur de champ magnétique seraient parallèles à la surface des éléments à effet Hall, pénétrent les éléments à effet Hall presque verticalement à leur surface. Contrairement aux éléments à effet Hall horizontal, les éléments à effet Hall vertical peuvent également être utilisés lorsqu'ils sont disposés près du concentrateur de champ magnétique. Le capteur est particulièrement adapté à servir de capteur d'inclinaison.

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