Re: [TCML] homemade transformer

["Christoph Bohr" <cb@xxxxxxxxxxxxxxx>]

Hello Tim.

> what was the size of the primary and secondary wire?
The primary was 3qmm iirc, cant measure now as the xformer is under oil now.
I used 0.4mm doulbe enamled wire for the secondary which is quite on the large side,
but space was plenty so I went for it.

>   as i have a real nice 3 phase transformer core that would be perfect for some
experimenting.
I would really like to see more hombuild transformers for sure, but it may be worth
wayting for the
right transformer to start with. Do you have pictures of yours?

regards

Christoph Bohr

>
>   tim
>
> Christoph Bohr <cb@xxxxxxxxxxxxxxx> wrote:
>   Hello Godfrey.
>
> > How did you get the third leg out of the core of a three phase
> > transformer. Maybe you used one transformer from a three phase bank of
> > three single phase transformers.
> This was a true 3 phase transformer that came from a Siemens variable frequency
> drive.
> Luckily the core consisted of 5 pieces that were pressed together by means of 4
> threaded
> rods and was heavily soacked with cast resin, so removing the center leg was
simple.
> I am not sure how easily it would be to saw one leg off if it was a normal IE core,
> would have to
> be a pretty clean cut to avoid eddy currents.
>
>
> > I really like those big square
> > cores...lots of work area room.
>
> Winding was pretty simple, I took the outer leg and just wound directly onto the
> core, no
> bobbin was used and the inner end of the winding connects directly to the core, so
> there
> are no insulation problems. Probably it would have been better if I wound directly
on
> the
> leg with the primary on it... but hard to change now.. ;-)
> The xformer is kind of lossy, but not too bad, and it limits itself to around 5KVA.
> Not perfect trensformer design, but still useable and pretty much perfect for TC
use.
> It's about two years old now and saw quite some service without problems.
>
> regards
>
> Christoph Bohr
>
>
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