Patent ID: 9478342
Filing Date: 2016-10-25
CPC Classification: H01F,H01H

Claim Text:
1. An actuator for a switchgear, comprising: a core including a package of core element layers made of magnetic material with permanent magnets between the core element layers; a movable plate made of magnetic material, the movable plate configured to open or close a magnetic circuit to the core; an electromagnetic coil, which is surrounded by the core elements; a central actuator rod; at least one screw for mechanical connection of the core element layers and the permanent magnets, wherein the at least one screw is oriented perpendicular to a plane of stacking of the core element layers, and a screw-hole for each at least one screw is implemented through the core element layers and the permanent magnets, and wherein the screw-hole ends in a diameter extended opening, so that a screwhead of the screw is positioned and recessed into the diameter extended opening; and wherein the permanent magnets and/or the magnetic core material of the layers are dimensioned such that an amount of material reduction volume of the permanent magnets and/or the magnetic core element layers according to the extended openings and/or the screw holes, which are aligned through the permanent magnets, is added at flanks of the permanent magnets.