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
