Chris. I'm still learning electronics. Could you expand a bit on this please.
Maybe draw a napkin sketch of it. Sorry to be a bit slow on the uptake On Thu, Feb 13, 2020, 5:46 AM Chris Albertson <albertson.ch...@gmail.com> wrote: > A sin and cos are 90 degrees apart. All you should need to do is threshold > the signal and you have A/B quadrature. Many ways to threshold it but > you want the one with least noise. > > A simple way to convert a sin wave to a square wave is to amplify then clip > it with diodes. A comparator can also convert the signal. > > The point to remember is that sin/cos is quadrature and all that is needed > is some signal conditioning. > > On Tue, Feb 11, 2020 at 10:46 PM andrew beck <andrewbeck0...@gmail.com> > wrote: > > > Hi guys > > > > wondering if anyone has any ideas here. > > > > I have a heidanhain spindle motor that runs up to 10000 rpm and has a 5v > > sin cos encoder on it. I am currently controlling the motor with a > > schiender vfd. I am talking to the support engineers here in New Zealand > > about buying a encoder card so I can get better low down torque. If I > run > > the card in full encoder closed loop control in the vfd I can get 200 > > percent of the torque right down to 0 rpm for 30 seconds or so which is > > pretty useful. I am currently just running the drive in Variable > frequency > > control which rapidly looses torque at low rpm. > > > > Anyway they have a bunch of cards I can use but don't have a encoder card > > that is suitable for sin cos encoders. I have no trouble changing the > > encoder but am not sure if I can get a source of encoders that spin up to > > 10k rpm. > > > > Anyone have any suggestions? > > > > regards > > > > Andrew > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > -- > > Chris Albertson > Redondo Beach, California > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
