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System for sensing the angular position of a rotatable member using a hall effect transducer

  • US 4,789,826 A
  • Filed: 03/19/1987
  • Issued: 12/06/1988
  • Est. Priority Date: 03/19/1987
  • Status: Expired due to Term
First Claim
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1. Apparatus for sensing the angular position of a shaft of a tension arm supported by a housing for rotation through a preselected angle of less than 360°

  • comprising;

    a circular magnet of selected circumference having a pair of north-south magnetic poles selectively induced therein for generating an arcuate magnetic field thereabout, the magnet being coaxially secured for rotation with the tension arm through the preselected angle of less than 360°

    ;

    magnetic field transducing means selectively secured to the housing in close and constant proximity to the circumference of the circular magnet, and at a preselected position in the magnetic field between the north-south magnetic poles corresponding to a preselected center angular position of the tension arm; and

    circuit means including offset adjusting amplifier means responsive to the magnetic field transducing means for supplying a preselected null voltage when the tension arm is at the preselected center angular position, and a linearly varying voltage indicative of the degree of rotation of the tension arm within said preselected angle of less than 360°

    when the arm is angularly displaced from the preselected center angular position.

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