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12344Re: [SeattleRobotics] Phase separation for Quadrature Encoding

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  • Jeffrey T. Birt
    Dec 1, 2002
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      Another option is to make a split phase (same number of lines\slots 90 deg
      apart)encoder wheel and then place you two sensors 180 deg. apart. One
      looking at the first phase of the wheel the other looking at the second
      phase. You can then use any resolution of wheel and always have 90 deg..
      separation.

      Jeff Birt
      ----- Original Message -----
      From: "Terry Schumacher" <tlschumacher@...>
      To: "SeattleRobotics (E-mail)" <SeattleRobotics@yahoogroups.com>; "Twin
      Cities Robot Club (E-mail)" <tcrobots@...>
      Sent: Sunday, December 01, 2002 12:40 AM
      Subject: [SeattleRobotics] Phase separation for Quadrature Encoding


      > I've read a number of places that for quadrature encoding, you want the
      two
      > inputs to be 90 degrees out of phase.
      >
      > My question is, how important is the value of 90? Is it more important
      that
      > the two signals be out of phase with each other.
      >
      > I have a slotted wheel on my motor. It currently has a single sensor.
      I'd
      > like to move it one direction and place an identical one next to it. It
      > would be hard to get it adjusted to exactly 90 degrees out of phase.
      >
      > I'd sure appreciate if someone could help clear this up for me.
      >
      > Thanks.
      >
      > ----------------------------------------------------
      > Terry Schumacher
      > Senior Consultant
      > Dynamic Information Systems
      > http://www.dynamic-info.com
      > mailto:TLSchumacher@...
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