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
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United States of America Patent
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Apr 10, 2001
Grant Date -
N/A
app pub date -
Oct 5, 1998
filing date -
Oct 3, 1997
priority date (Note) -
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Abstract
A sensor system for measuring linear displacement of a first member relative to a second member, includes 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, and a permanent magnet secured to the second member and having a front surface facing the Hall Effect sensor and extending along the direction of relative movement between the first and second members. The permanent magnet is magnetized so that the front surface has a first magnetic pole of a first magnetic polarity at a first end and a second magnetic pole of a second magnetic polarity at a second end spaced from the first end in the direction of travel.
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