Electromagnetic actuator, e.g. for controlled switching, has armature with polarized permanent magnet between armature plates in sandwich construction that contacts yoke at least with end of upper plate, air gap between lower plate, yoke

摘要

The device has an electromagnet (1) with a core (1.2) and a stimulation coil (1.1), an armature (2) and spring element (5) and a yoke (1.3) extending in the armature's direction of motion and connected to the core. The armature has a polarized permanent magnet (2.2) enclosed by upper and lower armature plates (2.3,2.1) in a sandwich construction that contacts the yoke at least with one end of the upper plate and there is a secondary air gap (3) between one end of the lower plate and the yoke.