I think I know how it can be done too. Will take a bit of work though.. But such a circuit/software would be very useful for rigid tapping on a regular milling machine with a normal 3-phase induction motor.
Roland On Sun, 30 Jun 2019 at 14:19, Nicklas Karlsson <nicklas.karlsso...@gmail.com> wrote: > On Sun, 30 Jun 2019 12:18:24 +0200 > Roland Jollivet <roland.jolli...@gmail.com> wrote: > > > A while back there was some discussion on using an induction motor as a > > servo motor. I can't find the thread.. > > I think I know how this should be done but had to fight it for a while. > Now it seems performance is very good, maybe similar to a permanent magnet > motor but I did not compare though good performance on higher rpm I am > still a little bit uncertain about. I used a slightly different algorithm I > did not find in books/articles that seems to work really well. > > Some drives have vector control of induction motor but do not know > performance of these. > > > Yesterday, at the scrapyard I hauled two of these exact motors off a > roller > > press; > > > http://www.lithronix.com/komori/komorimatic-water-fountain-roller-actus-power-motor-rebuilt-ni20-200fg-x4kt > > > > I was quite disappointed to find out there was no permanent magnets in > > them, and there were no matching drives. > > So they are induction, but perhaps made differently to your general > > induction motor. > > It's a beast of a motor for 200W... At least they come with a 1000 P/R > > encoder > > 1000 P/R is most probably good enough. > > > Nicklas Karlsson > > > _______________________________________________ > 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
