RE: [CAD_CAM_EDM_DRO] high frequency spindle motors

Maybe I'm being stupid,
but we use quite a few (small) reversible synchronous motors which require 2
drives 90 degrees out of phase.
A Scott Tee may be ok etc etc, but would it not be easier to just add a cap
in series with one of the windings, and just run it off a single phase
supply? if the lc series pair is arranged to have the same resonant
frequency as the drive 1/(2*pi*root(LC))then both coils will be 90degrees
out of phase. MUCH simpler

However if the frequency is to be widely varied, the cap won't work.
Nig

> >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.