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


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