Proportional actuator for proportional control devices

H - Electricity – 01 – H

Patent

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Details

H01H 3/00 (2006.01) F02M 59/46 (2006.01) F16K 31/02 (2006.01) F16K 31/06 (2006.01) H01H 5/00 (2006.01) H01H 7/00 (2006.01)

Patent

CA 2353149

A proportional actuator (10) for proportional control including a saturation tip (24) formed on the movable armature (16) for movement within a step-wound coil (18). The coil providing clearance for the saturation tip, allowing the coaxial diameters of a magnetic pole piece (14) and the armature. The configuration of the armature provides significantly higher magnetic force attraction between the magnetic pole piece and the armature because of the increased coaxial diameters of the armature and the pole piece. In addition, because of the increased diameter of the armature, the surface area of the armature that is exposed to the saturation tip is increased, thereby increasing the amount of flux that is coupled to the magnetic pole piece by the saturation tip. The proportional actuator is described with reference to applications in proportional control valves. Highly preferred embodiments of the proportional control valve include a damping mechanism for minimizing overshoot by providing restricted fluid flow path between the magnetic pole piece and the armature and tank pressure for fluid being supplied to or removed from the apparatus being controlled by the proportional control valve.

L'invention concerne un positionneur proportionnel (10) servant à effectuer un contrôle proportionnel, qui comprend une une pointe de saturation (24) formée sur l'armature mobile (16) pour suivre un mouvement à l'intérieur d'une bobine à enroulement étagé (18). La bobine présente un dégagement pour la pointe de saturation qui accueille les diamètres coaxiaux d'une pièce à pôle magnétique (14) et l'armature. La configuration de l'armature exerce une attraction de force magnétique considérablement plus élevée entre la pièce à pôle magnétique et l'armature. En outre, l'augmentation du diamètre de l'armature augmente la zone superficielle de l'armature exposée à la pointe de saturation et, partant, le volume de l'écoulement couplé à la pièce à pôle magnétique par la pointe de saturation. Le positionneur proportionnel se rapporte à des applications mettant en oeuvre des soupapes de commande proportionnelles. Des formes de réalisation préférées de la soupape de commande proportionnelle incluent un mécanisme d'amortissement qui sert à réduire au minimum la saturation en ménageant une voie d'écoulement restreinte des liquides entre la pièce à pôle magnétique et l'armature, et une pression du réservoir pour les liquides en train d'être acheminés vers ou retirés de l'appareil contrôlé par la soupape de commande proportionnelle.

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