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Magnet Ring with Jittered Poles

  • US 20200136476A1
  • Filed: 12/28/2018
  • Published: 04/30/2020
  • Est. Priority Date: 10/31/2018
  • Status: Active Grant
First Claim
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1. An apparatus for determining a rotational position by correlating a characteristic shift pattern to a measured magnetic field pattern, the apparatus comprising:

  • a first platform having a first side;

    a second platform having a second side that at least partially overlaps with the first side of the first platform, wherein the second platform is configured to rotate relative to the first platform about an axis;

    a magnet ring mounted to the first side of the first platform and centered around the axis, wherein the magnet ring comprises four or more magnetized poles, wherein the four or more magnetized poles are positioned such that each respective boundary between neighboring poles of the four or more poles is shifted relative to a corresponding nominal boundary defined by a uniform spacing of boundaries of the four or more poles around the magnet ring, and wherein the shifted boundaries of the four or more poles define the characteristic shift pattern of the magnet ring; and

    a magnetic field sensor connected to the second side of the second platform and configured to generate the measured magnetic field pattern by measuring characteristics of a magnetic field generated by the four or more poles.

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