On Sun, 30 Jun 2019 10:39:27 -0400 Gene Heskett <ghesk...@shentel.net> wrote:
> On Sunday 30 June 2019 06:18:24 Roland Jollivet wrote: > > > A while back there was some discussion on using an induction motor as > > a servo motor. I can't find the thread.. > > > > Yesterday, at the scrapyard I hauled two of these exact motors off a > > roller press; > > http://www.lithronix.com/komori/komorimatic-water-fountain-roller-actu > >s-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 > > > Since the link doesn't say how many wires go into the motor, if its 2 or > 3 phase etc, its hard to make good guesses. > > If its a 3 wire motor, a small 250 volt input vfd would be a good driver, > and I would couple the encoder up to feed back to the vfd, such that > you'd have a position servo. You would need to program the vfd to not > shut down at the lower frequencies, and to not deliver more than the 1.3 > amps per winding even when the vfd thinks its detecting a locked rotor. > The encoder, for a position servo would need to be something that could > be converted to ABX because you'd need to record the home position as x > counts from the index. And I'd gate the z signal thru the home switch. > Home by driving to the home sw closure, then track the counts to the z > signal running in the same direction and call that home. > ... Vector control is needed for fast dynamic response, it's a little bit extra tricky for induction motor. Nicklas Karlsson _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
