## Aluminum Square Tubing Primary Inductances?

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• As mentioned some time ago, I am exploring a concept using square tubing as the primary. It became necessary to construct this as a pentagon, using 1 ft by .5
Message 1 of 1 , May 13, 2008
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As mentioned some time ago, I am exploring a concept
using square tubing as the primary. It became
necessary to construct this as a pentagon, using 1 ft
by .5 X.5 in dimensions. Five winds have been
connected in such a way that the pattern resembles a
horiz and vert lateral cross; with the central wind
being one set, and winds 1-4 being another set, where
the central wind uses its entire surface area,(5 *.5 *
4)= 10 sq inch as the internal capacity of the
(primary)coil itself. The insulation between the winds
is a combination of superglue and PVC Radio Shack
Megacable speaker wire, that itself spirals around
this central wind for a total of (5 * 4 = 20) turns
around the pentagon. Thus an additional interweaving
set of winds is available for the purpose of measuring
a "lorentz force interaction" between the central and
outer windings. This should only be the case if the
current directions between the central wind and the
outer winds are in opposition, thus reducing the
inductance of the primary. But in this case both the
magnetic fields of the individual outer conductor
winds and the central one will be in magnetic
agreement on adjacent conductors, and both a
orthogonal electric and magnetic field should be
present to move the free electrons of the speaker wire
on the third right angle of space as the interweaving
wire is laid. The problem now becomes the LCR meter
readings accuracy, as this is a low end of inductance
measurement, and does not correspond the what
mathematical Wheeler equation type predictions yeild.
If the primary were operated with all five winds
in agreement the Wavetech LCR meter reads 32.7 uH, and
for the central wind being opposite it reads 17 uH.
The intention here is to employ the arc gap IN SERIES
with the central winding, or within the primary coil
itself and not external to the coil as other designs
dictate. The midpoint open circuit break LCR C
reading seems high; .472 nf, perhaps the superglue has
a high dielectric constant.

Thus we might suspect that operated in magnetic
agreement with the L and C values of 32.7 uH and .427
nF: the arc gapped resonator should yeild a frequency
of ~ 128 khz, but this does not account for the fact
the every changing electric field has a counterpart
magnetic field at right angles to itself, and this in
turn might change the acting L value of the primary.
Other larger scale measurements of this (magnetic flux
capacitor) effect at lower frequencies suggest a 10%
deviance from the book calculated R(f) value, but the
direction of the deviance for this case is unknown,
where ordinarily this is determined by the polarity
connection of the capacity inserted into the
orthogonal space of the resonating inductors magnetic
field.

For that unique case of (1/5th)external magnetic
cancellation, but internal magnetic unity using 17 uf,
the resonance formula yeilds a very high figure of
~1,777,000 hz. Now the problem becomes comparisons to
formulas. Using an average between 18 in. and 20.5
in. diameter as the pentagons closest and farthest
pts. and the formula
Uh= .8(R^2N^2)/[6R+9L+10B]
Where dimensions given in inches are used and have the
values
R = 9.625 in
L = 2 in.
B = 2 in

I arrive at a value just under 1 uH, about a 33 fold
error according to LCR meter. Do folks think the LCR
meter is wrong? Are formulas obscured by the unusual
geometry being employed here?

Sincerely Harvey D Norris

Tesla Research Group; Pioneering the Applications of Interphasal Resonances http://groups.yahoo.com/group/teslafy/
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