Javier Ros Ganuza wrote: [most of the thread snipped]
>Sorry if it sounds too trivial, but I'm lost, what is the diferencie >between encoder and resolver. Well, I know what is a encoder, but I was >thinking that a resolver was in fact a encoder. So what is a resolver (a >potentiometer?)? > > A resolver is a different kind of sensor, which detects the rotation of a magnetic/electric field. These are AC excited analog sensors which will give you absolute rotation information from 0-360 degrees. See this wikipedia page: <http://en.wikipedia.org/wiki/Resolver_%28electrical%29> An encoder is a digital device, which outputs a code based on position. This will either be a binary code giving the absolute position or (more common for CNC) an incremental quadrature code based on movement. See this wikipedia page: <http://en.wikipedia.org/wiki/Rotary_encoder> >>>So in general (just for curiosity), index pulse is always taken from Z >>>and/or /Z signal from quadrature encoder??? >>> >>> Most incremental encoders with index outputs label the index channel "Z". I think "I" is also used sometimes. >>Correct. >> >It has been very clarifying for me. > >So, it can be said that: "index pulse" is a concept internally defined >by EMC and depending on hardware the driver can implement this index >pulse in different ways. It happens that with the motenc-100 driver, or >with other divers using quadrature encoders, the index pulse is defined >using available Z and/or /Z quadrature signals. > > No. Index pulses are not an EMC-specific thing. Index is a separate channel that is used for detecting the orientation of the motor shaft. A normal incremental quadrature encoder can only tell you that the shaft has moved and in which direction. The index tells you that the shaft is at a certain angle, which people usually define as 0 degrees rotation. >Do you agree? > >Thanks a lot > >Javier > > Good luck - Steve ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier. Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
