Patent ID: 7623012

Claim:
An electromagnetic actuator drive for adjusting a final controlling element among at least three positions, comprising a soft magnetic armature ( 2 ) which is drive-coupled or drive-coupleable to the final controlling element and has a plurality of armature faces ( 5 , 6 ), a plurality of soft magnetic pole elements ( 7 ), each having a plurality of pole faces ( 8 , 9 ) on which the armature faces ( 5 , 6 ) come to rest in two end positions of the armature ( 2 ), a restoring device ( 10 ) which drives the armature ( 2 ) by means of a restoring force into a starting position between the end positions, a holding device ( 11 ) with the help of which the armature ( 2 ) can be secured in its end positions by means of electromagnetic forces, wherein an even number of at least two pole elements ( 7 ) is provided, a separate electromagnetic coil ( 12 ) is assigned to each pole element ( 7 ), the hold device ( 11 ) applies electric current to the coils ( 12 ) for securing the armature ( 2 ) in its end positions so that the pole faces ( 8 , 9 ) of neighboring pole elements ( 7 ) are oppositely polarized, the pole elements are arranged radially with regard to the axis of rotation; the coils each coaxially enclose the respective pole element; and the winding axis of the respective coil runs radially.