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Inductor question
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From: Mail Delivery Subsystem
Sent: Friday, September 06, 1996 1:31 PM
To: Landon Solomon
Subject: Inductor question
I am wondering if welding rods are soft iron(like you get after slow cooling
from red hot) or not, and whether this would make a diference?
>----------
>From: Tesla List
>Sent: Thursday, September 05, 1996 11:25 PM
>To: Tesla-list-subscribers-at-poodle.pupman-dot-com
>Subject: Inductor question
>
>>From sroys-at-umabnet.ab.umd.eduThu Sep 5 22:15:14 1996
>Date: Thu, 5 Sep 1996 12:04:10 -0400 (EDT)
>From: Steve Roys <sroys-at-umabnet.ab.umd.edu>
>To: tesla-at-pupman-dot-com
>Subject: Inductor question
>
>I am playing around with a variable inductor that has a 4" diameter
>sliding core packed with 20 pounds of welding rods (idea compliments of R.
>Hull) that I plan on using to regulate the current in my 50A controller,
>and I have a few questions.
>
>I don't really have the right wire to wind it with yet, so I just wound it
>with some heavy wire (2 or 4 gauge maybe with fairly thick insulation)
>that I had to see how it works. There aren't a lot of turns in the 13"
>winding length, so the inductance is pretty low, but I noticed that the
>difference between the core being totally out of the winding and totally
>in is less than a factor of 5. Is this reasonable for 20 lb of iron
>welding rods or could something else be screwed up? Using Wheeler's
>formula for the inductnace of an air-core solenoid, I compute a value
>that's pretty close to what I measured with the core out, but I would have
>thought that the iron would have made much more of a difference. Would
>winding a coil with 6 gauge magnet wire (which would give me a much higher
>inductance to start with) make more of a difference?
>
>Thanks in advance.
>
>Steve Roys.
>
>