Geometrical instruments – Miscellaneous – Light direction
Patent
1997-10-03
1999-12-21
Fulton, Christopher W.
Geometrical instruments
Miscellaneous
Light direction
33568, 33573, 33DIG1, G01B 700, B23Q 1600, B25H 100
Patent
active
060032308
ABSTRACT:
A magnetic positioner is provided which is capable of providing long travel in two dimension and short travel in the remaining four dimensions. The positioner has a movable stage and a stator oriented adjacent and substantially parallel to this stage. At least three sets of first magnetic elements, which for preferred embodiments are winding sets capable of generating forces in two directions, are on the portion of the stator adjacent to the stage at any given time, and at least two second magnetic elements, which are magnet arrays for the preferred embodiment, are on the stage adjacent to the stator. At least one of the second magnetic elements overlaps multiple first magnetic elements for all positions of the stage relative to the stator, with one magnet overlapping multiple windings for one preferred embodiment of the invention and two magnets on the stage overlapping multiple windings on the stator for a second embodiment. The windings form a linear motor providing forces in both a corresponding long travel dimension and in a dimension perpendicular to both long travel dimensions.
REFERENCES:
patent: 3376578 (1968-04-01), Sawyer
patent: 4535278 (1985-08-01), Asakawa
patent: 4654571 (1987-03-01), Hinds
patent: 5631618 (1997-05-01), Trumper et al.
patent: 5699621 (1997-12-01), Trumper et al.
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Kim, Won-jong and David L. Trumper, "Force Ripple in Surface-Wound Permanent-Magnet Linear Motors," Presented at Intermag 1996, Seattle, Washington, 3 pgs., (Apr. 9-12, 1996).
Trumper, David L., Wong-jong Kim and Mark E. Williams, "Design and Analysis Framework for Linear Permanent-Magnet Machines," IEEE Transactions on Industry Applications, 32(2):371-379, (Mar./Apr. 1996).
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Hinds, W. E. and B. Nocito, "The Sawyer Linear Motor," Proceedings of The Second Symposium on Incremental Motion Control Systems and Devices, pp. W-1-W-10, 1973.
Petla, E. R., "Two Axis Sawyer Motor," Proceedings of the 12th Annual IEEE Industrial Electronics Society Conference, pp. 3-8, 1986.
D. L. Thumper, W.-J. Kim, and M. E. Williams, "Design and Analysis Framework for Permanent-Magnet Machines," IEEE Transactions on Industry Applications, 32(2):71-379, Mar./Apr. 1996. Also in the Proceedings of the IEEE Industry Applications Society 29th Annual Meeting, pp. 216-223, Oct. 1994.
Kim Won-Jong
Trumper David L.
Fulton Christopher W.
Massachusetts Institute of Technology
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