Two-axis motor with high density magnetic platen

Details Two-axis motor with high density magnetic platen Two-axis motor with high density magnetic platen

1998-04-23

1999-12-21

Ramirez, Nestor

Electrical generator or motor structure

Dynamoelectric

Linear

310 13, 74471XY, 33 1M, H02K 4100

Patent

active

060053097

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: 2911538 (1959-11-01), Munz
patent: 3268747 (1966-08-01), Snowdon
patent: 3881139 (1975-04-01), Inaba et al.
patent: 4626749 (1986-12-01), Asakawa
patent: 5777402 (1998-07-01), Chitayat

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