Patent ID: 6028499
Filing Date: 2000-02-22
Classification: H01F,H02K

Abstract:
A single-phase electromagnetic actuator comprising:a first moveable unit which is movable along an axis of movement and arranged synmetrically with respect to a median plane perpendicular to said axis of movement, said first movable unit integrally comprising at least one ferromagnetic part:a fixed stator part formed from a soft magnetic material and defining at least two gaps with respect to said at least one ferromagnetic part, said at least two gaps being arranged symmetrically with respect to said median plane;an electrical coil housed in at least one cavity disposed within said fixed stator part;a transversely magnetized thin permanent magnet arranged such that said median plane intersects a middle of said thin permanent magnet, said magnet comprising a thin radially magnetized tubular part located in the cavity in which the electrical coil is housed and inside an internal diameter of the electrical coil, wherein a direction of motion of said first movable unit corresponds to a direction of current flowing through said electrical coil, and wherein an amount of motion of said first movable unit corresponds to an amount of said current; andtwo springs, each of said springs exerting a repelling force upon a selected one of first and second ends of the first movable unit, said repelling force being oriented along the axis of movement.