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RE: [TCML] aluminum magnet wire
The difference between CU and AL is:
AWG (26) assumed
Diameter 0.0159 in 0.0159 in
Circular Mils 254 254
P, ohms/cm^3 1.72E-8 2.82E-8
Ohms/1K feet 40.81 67.0
Skin depth = 66200 / sqrt(F) microns
Skin Depth, 250 KHz 132 microns 132 microns
SNIP SNIP (further derivations)
AL will reduce the "Q Factor" (Xs / Rs) by the ratio of 40.81/67.0, or
0.609. This is a 39% decrease in Q. This leads to a 39% decrease in peak
This difference can be, simply, made up for by reducing the gauge of the
wire from 26 to (about) 24 gauge. In other words, drop two gauges and AL is
equivalent to CU.
This analysis neglects, of course, all the weird, strange, quantum and
relativistic effects attributed to Tesla Coils by virtue of their name. No
mantras were spoken in the derivation and no candles were burned nor animals
Analysis derived but not read...
References are left as an exercise to the student!
73 & Stay Vertical,
Jim Harvey (W7YV) - The Great Curmudgeon
P.O. Box 18009
Salt Lake City, UT 84118
FIST # 13337
SKCC # 3194
"Calling CQ was like a box of chocolates. You never know what you're gonna
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of DC Cox
Sent: Friday, February 27, 2009 3:59 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] aluminum magnet wire
Resistance is a bit higher, which for RF purposes is usually not good. It
would work but with somewhat reduced peak current (less bright spark) than
In 1974, I did a test matching exact quantities of copper and alum wire, and
the alum was 75 amps less peak current current on a medium size coil.
But, if the price is way low, like surplus, you could try it.
On Fri, Feb 27, 2009 at 12:25 PM, jimlux <jimlux@xxxxxxxxxxxxx> wrote:
> Has anyone ever tried winding a secondary with Aluminum magnet wire?
> The resistance, for the same size winding, etc., would be higher, but
> I think that secondary resistive losses aren't a huge thing.
> It would be lighter weight, and potentially cheaper.
> If you got a secondary strike or racing sparks, the wire would melt
> What about pricing on insulated aluminum magnet wire?
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