Bistable magnetic drive with permanent magnetic displacement armature e.g. for motor vehicle mechanical clutches or brakes

摘要

The drive has at least one armature (100) of a disc-shaped permanent magnet (3) with two soft magnetic poles (4, 4') magnetised in the motion direction. The armature is movable along a common axis between two electromagnetic stop poles of the same polarity and is located axially within a recess of a third, oppositely polarised electromagnetic pole between outer poles (5, 5'). The third, annular pole (Rp) and/or the outer poles protrude from a coil (1) would on a soft magnetic core (2). The armature permanent magnet, between the two soft magnetic poles is of material with a min. residue induction Br of 0.7T at an energy prod. BH max. or at least 100 KJ per cu. m. The permanent magnet thickness is specified.