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Linear position sensor having a permanent magnet that is shaped and magnetized to have a flux field providing a sensor output that varies linearly between opposite end points of relative linear movement between the magnet and sensor

  • US 6,215,299 B1
  • Filed: 10/05/1998
  • Issued: 04/10/2001
  • Est. Priority Date: 10/03/1997
  • Status: Expired due to Term
First Claim
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1. A sensor system for measuring linear displacement of a first member relative to a second member in a linear direction of relative movement comprising:

  • an analogue Hall Effect sensor secured to the first member in an orientation to sense magnetic flux in a sensing direction perpendicular to said direction of relative movement, a permanent magnet secured to the second member and having a front surface that faces the Hall Effect sensor and extends along the direction of relative movement between the first and second members, the permanent magnet having opposite ends spaced-apart in said direction of relative movement, the permanent magnet being magnetized to have a magnetic pole of one magnetic polarity on said front surface adjacent one of said opposite ends and a second magnetic pole of an opposite magnetic polarity on said front surface adjacent the other of said opposite ends.

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