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Electromagnetic position transducer

  • US 5,120,908 A
  • Filed: 11/01/1990
  • Issued: 06/09/1992
  • Est. Priority Date: 11/01/1990
  • Status: Expired due to Term
First Claim
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1. A position transducer comprising:

  • (a) helical electrically conductive transmitter coil having a plurality of coil turns and first and second end extremities, and a plurality of coil tap nodes thereon, the coil tap nodes being spaced between the end extremities;

    (b) oscillator means for producing a coil drive current;

    (c) selector means for sequentially connecting the oscillator means between the end extremities and selected ones of the coil tap nodes for producing a moving fringing field resulting from portions of the coil drive current flowing in opposite directions in the coil on opposite sides of each of the selected nodes;

    (d) a transducer body movable in a first transducer direction relative to the transmitter coil and having a receiver coil fixedly mounted thereto; and

    (e) circuit means connected to the selector means and responsive to the receiver coil for providing a first position signal, the first position signal representing the position of the transducer body relative to a first position reference, the first position reference being perpendicular to the first direction.

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