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Apparatus for detecting a rotary position of a shaft

  • US 4,719,419 A
  • Filed: 07/15/1985
  • Issued: 01/12/1988
  • Est. Priority Date: 07/15/1985
  • Status: Expired due to Term
First Claim
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1. An apparatus comprising:

  • a shaft;

    a ring-shaped magnetic member fixed to the shaft for joint rotation therewith, said ring-shaped magnetic member having a radially oriented magnetic pole pair for producing a monopolar continuous magnetic field having a uniform magnetic flux density around the entire periphery of said ring-shaped magnetic member at spaced equidistant locations extending radially outwardly of said ring-shaped magnetic member; and

    field measuring means supported adjacent said ring-shaped magnetic member radially outwardly thereof for measuring the intensity of said monopolar magnetic field acting on said field measuring means;

    said ring-shaped magnetic member encircling said shaft and being mounted eccentrically of the axis of the shaft so that the intensity of the monopolar magnetic field acting on said field measuring means varies in different rotary positions of the shaft.

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