Closed-path linear motor

  • US 5,994,798 A
  • Filed: 04/29/1998
  • Issued: 11/30/1999
  • Est. Priority Date: 02/26/1998
  • Status: Expired due to Term
First Claim
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1. A linear motor comprising:

  • a path;

    said path including a plurality of armature windings therein;

    a plurality of switches, each one of said switches controlling application of power to one of said armature windings;

    a linear motor stage movable on said path;

    a plurality of motor permanent magnets on said stage facing said path for interaction with said armature windings;

    means for controlling actuation only of those of said switches controlling application of power to those of said plurality of armature windings within a magnetic influence of said motor permanent magnets;

    said path describing a closed path; and

    means for permitting said linear motor stage to traverse said closed path.

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