Multiturn rotary encoder with multiple code carriers coupled by a reduction gear

  • US 6,542,088 B1
  • Filed: 03/28/2001
  • Issued: 04/01/2003
  • Est. Priority Date: 05/06/1998
  • Status: Expired due to Fees
First Claim
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1. A multi-turn rotary encoder, comprising:

  • a first code carrier connected with an input shaft;

    a scanning device that scans said first code carrier and generates an absolute position of said input shaft within one revolution, and a digital code word is present at an output of said scanning device;

    a second code carrier for measuring the number of revolutions of said input shaft;

    a reduction gear arranged between and coupled to said first code carrier and said second code carrier;

    said second code carrier comprises a magnetic body with at least one north and south pole;

    a substrate with a spatial arrangement of sensor elements integrated therein, which are sensitive to magnetic fields, is associated with said magnetic body;

    an evaluation circuit integrated into said substrate, wherein scanning signals, which are phase-shifted with respect to each other, from said sensor elements are supplied, and that said evaluation circuit combines said scanning signals in such a way that a second digital code word is present serially or in parallel at an output of said evaluation circuit; and

    a combination logical device, which is supplied with said first and second digital code words and which forms a resultant multi-digit code word therefrom.

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