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Capacitive rotary position encoder

  • US 9,441,990 B2
  • Filed: 07/08/2014
  • Issued: 09/13/2016
  • Est. Priority Date: 07/09/2013
  • Status: Active Grant
First Claim
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1. A capacitive rotary position encoder for the absolute determination of a rotary position about a rotary spindle comprising:

  • a transceiver unit, comprising;

    a first arrangement of a number of N electrically conductive, capacitive sensitivity areas which are embodied as angle segments over a defined angle range, which are distributed uniformly over the circumference,an electrically conductive reference area andan evaluation circuit, by means of which an electrical capacitance value between the reference area and one of the sensitivity areas is determinable,wherein the sensitivity areas and the reference area are embodied as conductor track structures on a first electronics printed circuit board, anda counterpart situated opposite the transceiver unit and rotatable relative thereto about the rotary spindle and comprising;

    a reference coupling area arranged opposite the reference area, andan arrangement of a number of X≧

    3 electrically conductive code areas electrically connected thereto, wherein;

    the code areas are embodied as angle segments having at least approximately the same defined angle range as the sensitivity areas andthe code areas are arranged in a rotationally asymmetrical angular distribution about the rotary spindle.

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