Hello,

I guess - as another people marked - it is an asynchronous motor. To solve
your problem, find a VFD on e-bay. I just did it and have one perfectly
fits for your problem, current bid is $189. I never would manufacture such
a beast for this price!

Regards,
Imre


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On Wed, 15 Oct 2003, Simon Davies wrote:

> Thanks again Jinx, I am fumbling in the dark as well!
>
> This was very interesting, especially the comments about using FETs which
> was my original thoughts.
>
>
> >However, I really hate bangs and smoke and have to admit being
> >more than a little reticent to actually make this circuit. Although I
> >was talking with people obviously more learned than myself, there
> >was some disagreement between them. In future I think I'll stick to
> >DC motors and just turn AC motors on/off. Variable speed
> >synchronous drive seems like a hell of a lot of work and just not
> >worth it for a one-off
>
> Agreed, especially since the object of the exercise is to make my lathe more
> useable not to go into a major development cycle for a one-off!
>
> Perhaps I will just go and look at the contents of the piggy bank and go
> down the DC motor route.
>
> Simon
>
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