Core structure for electromagnetic devices

摘要

An electromagnetic device comprises a stator structure having a central pole piece and axially spaced end pole pieces on opposite sides thereof. The device also includes an axially movable armature surrounding the stator structure and having a step which defines with said central pole piece an air gap extending in the direction of relative movement of the armature and stator structure. End portions of the armature define air gaps with the end pole pieces which extend normally to the axis of movement of the armature. The stator structure mounts a pair of windings on opposite sides of the central pole piece, the windings being connected so that when energized the magnetic flux due to the windings will flow in the same direction through the central pole piece.