Re: [CAD_CAM_EDM_DRO] high frequency spindle motors

> >I have a *2 phase* AC induction motor. I did a little reading on polyphase
> >motors and discovered that there were actually 2 phase motors used at one
> >time. Instead of a 120 degree phasing they require 90 degrees between the
> >phases.
>
>to change for each freq. But, there IS a really neat circuit for
>converting 90 degree 2-phase
>to 3-phase, anc vice-versa. It is called a Scott-Tee. It is actually
>simple to make a Scott-T
>transformer setup. You need a 1:1 transformer with one of the windings
>center-tapped,
>and another 1:1 transformer.

Interesting! I found an example of a 3-2 phase scott-t on the internet. It
seems that going from 3 to 2 phase the center tap works, but going from 2
to 3 phase the tap needs to be offset. The example I found was 480v primary
and 120v secondary. I wonder if I could use 230v primary and 120v secondary
to reduce the voltage to the windings and still use a 230 volt VFD?

Could both transformers be identical? I though about a pair of used 1KVA
control transformers, but outside tapped 230v primary gets me only 60
volts. Looks as though I would need really expensive specialty
transformers...sigh

-Bob