Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – For magnetizing or demagnetizing
Patent
1998-04-23
2000-08-15
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
For magnetizing or demagnetizing
361139, H01F 720
Patent
active
061042692
ABSTRACT:
An X-Y positioning machine has a forcer, with armature coils, that moves around on a platen, supported by an air bearing. Magnets embedded in the motor platen generate a fixed magnetic field with which the armature coils interact. Perpendicular elongated coils interact with the fields of magnets in columns and rows. When a traditional rectangular pattern of the magnets is provided, a packing density and average peak magnetic flux intercepted by the coils are limited to 50%. The present invention provides magnet configurations that provide greater than 50% maximum peak flux density and up to 100% packing density. Several magnet arrangements are provided: a first in which round magnets are used instead of square, and a second in which diamond-shaped magnets are used. The latter can be used at 100% packing density arrangement. In addition to high peak flux density for a narrow coil, these embodiments exhibit low cogging forces. A method of making the magnet is also provided. To create the equivalent of a closely-packed array of circular magnets, a single sheet of magnetizable material is pressed against an high permeability element such as one of iron, and a pair of adjacent coils pressed against the magnetizable material with currents running in opposite directions. This forms a pair of round adjacent magnetic regions. The coils are moved systematically over the sheet of magnetizable material and the magnetization repeated. This process repeats until the sheet has a close-packed array of magnetic regions.
REFERENCES:
patent: 4920326 (1990-04-01), Agarwala
patent: 5025240 (1991-06-01), LaCroix
patent: 5334892 (1994-08-01), Chitayat
Amin Himanshu S.
Anorad Corporation
Donovan Lincoln
Gerasimow A. M.
Horn John J.
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