Re: [CAD_CAM_EDM_DRO] Re: RE: Re: Re: Transformers 3 phase power calculations and fuse size

At 4/26/2005 01:16 AM, you wrote:

> > The three secondaries can be connected together (paying attention to
> > polarity of the coils) to get 33 volts A.C. I'm pretty sure you can't (or
> > shouldn't) hook the two transformers together the way you describe because
> > they do not share a common iron core. It's been too many years since I
> > studied this to be definitive, but I suspect you could have "exciting"
> > results.
> >
> > Jeff
>
>Never though about this Jeff, so I rang a transformer manufacturer up this
>morning and they
>said no problem as along as they are in polarity.
>That shouldn't be a problems as the secondaries are clearly marked in a line.
>
>John S.

Hmmm. I would think there would be some significant conflicts. Transformers
aren't perfect isolators; there is some common mode transfer between
primary and secondary. I would expect some losses to heat due to common
mode current. Be careful to derate the expected output, though I couldn't
tell you by how much without specifics on the transformer.

Tom Harrison

> > Had a sort out today and found two identical transformers 240v single phase
> > in
> > and three 11v secondaries at 50 amps on each.
> > I presume I can chain these up to get 66 volts which will give me 94 volts
> > DC which
> > will be ideal for the 110v DC treadmill motors running off a 100v 20 amp
> > Rutex board
> >
> >
> >
>
>
>
>
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