Inductance Calculations for iron core

• To: tesla-at-pupman-dot-com
• Subject: Inductance Calculations for iron core
• From: "Coiler" <mycroft-at-access1-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Mon, 12 Jul 1999 07:47:04 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Looking for some help with figuring out how to build my own current limiting
inductor for my pig. Please don't tell me "you can do it
better/cheaper/etc.."
I already know that (I currently use a Lincon 225A AC welder as my limiter.)
I'm just one of those "Build it yourself" type of guys :)

What I am looking for is a guesstimate, or even the formulas to compute
the inductance knowing the approximate cross section area. My plan is to use
a bunch of rebar tie wire I have here, cut to about 20" lengths, to fill
a 2" PVC pipe. This would give me an open core with about a 1.6 square inch
cross section.
Estimated inductance per turn would be best, I'll probably use #10 THNN wire
for about 6 TPI. (roughly 110 turns end to end)

The OD of the PVC is actually 2.4" if that helps.
(and if someone could refresh me on the formula for reactance, I wouldn't
complain
either :) )
Thanks!

Michael Baumann
Coiler, Homebrewer, Nerd. mycroft-at-access1-dot-net

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