Re: transformer design

• To: tesla-at-pupman-dot-com
• Subject: Re: transformer design
• From: "Erik Schulz" <Gradient-at-mail.utexas.edu> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Mon, 17 May 1999 22:17:38 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hi,
    I did a few calculations and if you use your chokes as transformer cores
they should be good for 2.6-11.7 kva.  I don't know what the exact value is
since I don't know what material it is.  If you can find out the density of
the
core.  Say 3 significant figures.  I could look up what kind of material it
is.


> Original Poster: bob golding <yubba-at-clara-dot-net>

> Went to my favorite scrap yard today and hauled out a 3 phase choke. It is
> marked "3 phase reactor 112 amps 415 volts" When I got it home I quickly
> removed the windings,3 layers of 1/8"x1/4" section cotton covered copper
> wire. This has left me with a core of the following dimensions 10" x10" 3"
> with two windows 6" x 3" x 2". I have looked in the archives and think I
> can work out a design. What worrys me is the permeability of the core as
it
> was a choke rather than a transformer,and whether I should interleave the
> laminations or leave them as they are in an E and I configuration and
> suffer the core losses, or try to design them out by increasing the turns
> per volt. If any UK coilers are interested there are 4 or 5 of these in
the
> skip. I asked the man to put them on one side for me. They cost me 15 ukp
> each and weigh 40 kilos each. heavy!!If anyone wants to run though the
> numbers I would me grateful.

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