Electromagnetic drive

US8975992B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Martin Böttcher · Berlin, DE
• Marcus Kampf · Berlin, DE

Key dates

• Filing date: Aug 23, 2012
• Grant date: Mar 10, 2015
• Expiry date: Aug 23, 2032

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01F7/127
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

An electromagnetic drive for an electrical switch such as a circuit breaker, has at least one movable armature that can implement a lifting movement along a pushing direction for moving a movable switching contact of the switch. In a closed armature position, the armature closes a magnetic circuit through first and second magnetically conductive yoke parts. A permanent magnet produces a magnetic field for the magnetic circuit and a holding force for holding the armature in the closed position. A coil is disposed to generate a magnetic flux in the same or opposite direction as the magnetic flux of the permanent magnet. The electromagnetic drive can be readjusted after installation, where the first and second yoke parts are moved relative to one another by the permanent magnet into the adjusted state, whereupon they are fixed in position.