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Richard Erlacher
03/03/12 15:28
Read: 606 times
Denver, Co
USA


 
#186395 - by contrast ...
Responding to: Erik Malund's previous message
This one had quadrature and an index. By contrast with the 2500 ppr version to which references was previously made, this one only had 512 discrete positions between the index sensor, encoded by quadrature, using 2 signals, Gnd, and an index.

It's not a trick question.

Reference was made to one that had 2500 pulses per revolution, and an index, yet was considered "relative". I don't suppose the nomenclature makes that much difference, but I am curious. Doesn't the combination allow you to determine exact position, at least to within the precision limits of the encoder? Floppy disks and hard disks of the '60's and '70's worked the same way, having a track-0 sensor and just direction and step signals. I still routinely use that approach for stepper-driven positioning mechanisms.

RE

List of 20 messages in thread
TopicAuthorDate
controlling an incremental encoder      Carlos Gonzalez      03/01/12 21:50      
   controlling the encoders?      Jim Granville      03/01/12 22:05      
   Study time!      Andy Neil      03/01/12 23:41      
      Encoder is Feed back element      Satish S Munot      03/02/12 08:51      
         Encoder is normally feedback loop...      Per Westermark      03/02/12 11:05      
   Incremental?      Per Westermark      03/02/12 02:50      
      Incremental contrasts with Absolute      Jim Granville      03/02/12 02:59      
         Relative      Per Westermark      03/02/12 03:05      
            A small positive or negative change      Jim Granville      03/02/12 20:26      
         Isn't that absolute as well?      Richard Erlacher      03/03/12 08:25      
            trick question?      Erik Malund      03/03/12 11:00      
               by contrast ...      Richard Erlacher      03/03/12 15:28      
                  yes, but      Erik Malund      03/03/12 15:56      
                     O.K. I get it ...      Richard Erlacher      03/04/12 08:03      
                  Even With Index      Michael Karas      03/03/12 22:04      
                     Single Track Absolute Encoders      Michael Karas      03/04/12 07:20      
   just a point      Erik Malund      03/02/12 06:46      
   re      Ramesh Rai      04/18/12 20:59      
      Wrong sort of encoder!      Andy Neil      04/18/12 23:18      
      Spammer      Per Westermark      04/19/12 07:30      

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