transformer design

• To: tesla-at-pupman-dot-com
• Subject: transformer design
• From: bob golding <yubba-at-clara-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Thu, 13 May 1999 18:31:23 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hi all,

	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.

many thanks 

bob golding

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