Miniature crossed-coil gauge having an active flux ring

G - Physics – 01 – D

Patent

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Details

G01D 13/00 (2006.01) G01R 5/16 (2006.01) G01R 7/06 (2006.01)

Patent

CA 2233895

A miniature crossed coil gauge (30) having an oriented rare earth magnet (40) fixedly mounted on a rotary shaft (38) supplying a magnetic flux directed transverse to the shaft axis. The gauge housing provided by upper (32) and lower (34) bobbins surrounds the magnet and supports the shaft. First (42) and second (44) coils are wound about the gauge housing in a crossed coil orientation encircling the magnet. A flux ring (50) is disposed around the first (42) and second (44) coils axially aligned with respect to the magnet (40). The magnet (40) has sufficient strength and the flux ring (50) is mounted in sufficiently close to the first and second coils to redistribute flux supplied by the magnet so that magnetic flux measured at the surface of the coils is substantially increased relative to the magnetic flux density measured with the flux ring removed. This gauge construction facilitates fabrication of gauges so small that they can be directly mounted on printed circuit boards using conventional electronic component mounting equipment.

L'invention concerne une jauge miniature à enroulements en orientation croisée (30), dans laquelle un aimant orienté en matériau appartenant au groupe des terres rares (40) est fixé sur un arbre rotatif (38) pour engendrer un flux magnétique transversal par rapport à l'axe de l'arbre. Le boîtier de la jauge constitué d'une bobine supérieure (32) et d'une bobine inférieure (34), enveloppe l'aimant et supporte l'arbre rotatif. Un premier enroulement (42) et un second enroulement (44) ont placés en orientation croisée autour du boîtier de la jauge et encerclent l'aimant. Un anneau de flux (50) est placé autour de ces deux enroulements (42, 44), dans l'alignement de l'axe de l'aimant (40). Grâce à la puissance suffisante de l'aimant (40) et à la proximité suffisante entre l'anneau de flux (50) et les deux enroulements sus-mentionnés, on obtient une redistribution du flux établi par l'aimant de sorte que le flux magnétique mesuré à la surface des enroulements dépasse sensiblement la densité de flux magnétique mesurée lorsque l'anneau de flux est enlevé. Cette configuration de jauge facilite la fabrication de jauges dont la taille est suffisamment petite pour se prêter à un montage direct sur les cartes de circuits imprimés au moyen du matériel classique utilisé pour le montage des composants électroniques.

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