Patent ID: 8159806

Claim:
A bistable electromagnetic actuator with magnetic latching for opening and closing commands of a vacuum cartridge of a current breaking device, comprising: a magnetic circuit comprising a magnetic yoke in which a shunt extends perpendicularly to a longitudinal axis of said yoke, the shunt being positioned in parallel manner between first and second surfaces of said yoke, at least one permanent magnet with axial magnetization in the direction of the longitudinal axis of the yoke, said magnet being positioned between the first surface and the shunt, a plunger core mounted with axial sliding along the longitudinal axis of the yoke between a latched position and an unlatched position, at least one coil extending axially between the shunt and the second surface and being designed to generate: a first magnetic control flux that is added to the polarization flux of said at least one permanent magnet to move the plunger core from the unlatched position to the latched position, at least one return spring opposing movement of said plunger core, a second magnetic control flux opposing the polarization flux of the permanent magnet and enabling movement of the plunger core from the latched position to the unlatched position by the action of said at least one return spring, wherein the second surface of the yoke comprises an internal sleeve extending partially around the plunger core, the latter being separated from said sleeve by a radial sliding air-gap remaining uniform during movement of the plunger core in translation, and, in the unlatched position, the plunger core is separated from the second surface of the yoke by a third air-gap, the shunt being separated from the plunger core by a first axial air-gap, the sleeve, in the latched position, covering the plunger core over an overlap distance.