Linear motor with permanent-magnetic self-holding
AssigneeKarl Storz GmbH & Co. KG
InventorWalter Vogel
Life of this patent
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Abstract
A linear motor for optical systems, for example, endoscopes, is described. The motor has a stator with a magnetic guiding member and two adjacently disposed coils which are energized in opposite directions. Furthermore permanent magnets polarized in opposite directions and in the axial direction are provided on both sides of the pair of coils. The armature of the motor comprises a permanent magnet which is polarized in the opposite direction to the permanent magnet of the stator and is connected to a pole piece at each end. The pole pieces are arranged so that in the rest position each pole piece lies at the centre of one of the coils. By applying current to the coil, the armature can be displaced from a rest position in the longitudinal direction.
Claims14
A linear motor including
- a stator having at least one coil and at least one axially magnetized permanent magnet, which are enclosed by a magnetic guiding member, the at least one coil being disposed in a plane with the at least one permanent magnet;
- and
- an armature which is surrounded radially by the at least one coil and which is displaceable parallel to the stator, having a gap or a bore in the axial direction and having at least one axially magnetized permanent magnet and a number of pole pieces corresponding to the number of coils;
- wherein the magnetic flux of the at least one permanent magnet passes via the pole pieces through the at least one coil;
- and
- without the linear motor being energized, each pole piece is located inside a coil.
Dependencies are inferred from the claim text.