Abstract:
A linear actuator having an axially movable tubular armature which is encircled by a first even numbered group of alternate magnetic poles and by a second even numbered but axially displaced group of alternate magnetic poles; the second group of poles alternate with each other and with the poles of the first group. The armature carries conductor segments adjacent to each of the poles. These conductor segments extend normal to the axial direction of armature movement. Current supply means is effective to cause currents to flow in the proper direction in each of the conductor segments such that the conductor segments jointly contribute to a composite force causing axial movement of the armature.