Linear stepper motor
AssigneeNorthern Magnetics, Inc.
InventorWalter E. Hinds
Life of this patent
Estimating the term…
Abstract
A stepper motor includes a forcer wherein the teeth are formed in the pole faces by an etching process or machining and instepping. The etching can be achieved by forming the teeth in a separately formed plate which is anchored to the face of a forcer. A high density magnetic material is used for the plate and can also be used on the platen to improve performance of the stepper motor.
Claims27
A linear motor comprising:
- a forcer for movement over a platen,
- bearing means between the platen and the forcer,
- the platen having teeth directed transversely to the direction of movement of the forcer over the platen, the forcer having a series of teeth directed towards the platen and being for substantially parallel relationship with the teeth in the platen, and
- the teeth in the forcer being formed by a plate which is slotted and anchored to a face of a body member of the forcer for locating field windings, electromagnets, and a permanent magnet, and wherein the electromagnets form pole faces and the slots of the plate align with the pole faces.
A forcer for a linear motor having the forcer for movement over a platen, bearing means between the platen and the forcer, the platen having teeth directed transversely to the direction of movement of the forcer over the platen, the forcer having a series of teeth directed towards the platen and being for substantially parallel relationship with the teeth in the platen, and wherein the forcer includes a plate which is slotted to form the teeth, the plate being anchored to a face of a body member for locating field windings, electromagnets, and a permanent magnet, and wherein the electromagnets form pole pieces and the slots of the plate align with faces of the pole pieces.
A method of manufacturing a forcer for a linear motor comprising providing a plate with slots to form teeth between the slots, anchoring the plate to a face of a body member for locating field windings, electromagnets, and a permanent magnet, the electromagnets forming pole pieces, and aligning the slots of the plate with faces of the pole pieces.
Dependencies are inferred from the claim text.