> -----Original Message-----

I achieve almost perfect coupling with spirals using

> > From: Tesla list [mailto:tesla@...]

> > Sent: Monday, December 06, 2004 8:01 PM

> > To: tesla@...

> > Subject: OT: Request for help with air core

> transformer/power

> > transfer system

> >

> >

> > Original poster: David Speck

> <dave@...>

> >

> > List,

> > I know this isn't directly TC related, but I

> hoped someone with more

> > transformer theory experience that I have might

> lend a hand,

> > with Terry's

> > indulgence. Please feel free to respond

> privately.

> >

> > ->Sound enough like electricity transmission

> without wires ;o)) But

> > respond direct if not really related to Tesla

> coils) - T. <-

> >

> > I'd like to transmit about 6 volts AC at 60 Hz

> and 250 mA

> > through a glass

> > plate about 1/4" thick without drilling a hole in

> the glass,

> > and without

> > making any really esoteric circuitry like a high

> frequency drive

> > circuit.

wide margin width wire so that the spirals encompass

internal capacity. By perfect coupling, this implies a

reduction of impedance to the source; when the

recieving instrument is in proximity. As such the real

question is simple, place a set of spirals between a

glass plate, and record the inductance of the source,

where both the open circuit and closed circiut

configurations of the secondary are noted. If the

impedance of the source, neglecting resistive losses

which are ordinarily insignificant in my case of coil

transmissions: if that impedance [is cut in half] then

you have

perfect mutual coupling with identical L sets of

spirals. At a 6 VAC @ 60 HZ measurement, the

proposition shows that such a "source frequency"

inductance change measurement between spiral sets is

practically impossible, and typically such a

determination of mutual inductance by classic methods

states that the difference between those two reactive

states dictates the mutual induction between the

systems. The situation you are here describing is

easily possible by several considerations. The first

loophole beomes the fact that L1 and L2 as proximity

reactance measurements in fact can have little to do

with those same measurements made when each L quantity

is given a C quantity to resonate at the source

frequency resonance. In other words what looks like

almost independent magnetic action of two components

when measured in the reactive state, can exhibit far

more mutual inductance states when each L is given a C

value to resonate at the source frequency that now

delivers a whole new set of values is taken with

current delivery measurements on both input and output

comparisons of secondary open and closed situations.

As such the action of Of L2C2 as secondary can

influence the choice of the C1 value on the tuned

segment on the primary L1C1, whose C1 value is first

tuned to the reaction proximity of condition L2C2

circuit/ In the case of mutual inductance at resonance

however it is only mutual when the components share

flux change. As such a square multiturn coil can

induce more flux change on a adjacent spiral, then the

reverse situation will allow. and because of this, the

normal determination of mutual induction effects is

invalidated by comparing the unity to opposition

measurements in the reactive states, which is the

normal parameter noted as L1L2 interactions, which can

be signicantly greater or different between each other

when paired as L1C1/L2C2 interactions. To secure a

high inductance L1C1 primary at 60 hz would be a great

problem, but probably not nearly as bad as the problem

involved wiith matching the C2 value to the low

inductance spiral of the receiving instrument. The

key to considering the validity of air core inductive

systems at source frequency is the consideration that

AC alternators can easily deliver frequencies in the

500 hz range or beyond, and then the sensible pairings

of L1C1/L2C2 values can be made. In this described

situation of paired spirals between glass, @ 480 hz

with resonant spirals matched to the frequency

transmission of the alternator, power transmission

between the components would only be reduced according

to the flux leakage afforded by the glass, maybe a 80%

power loss, according to my guess. ()

An eight fold increase of frequency to 480 hz makes

the inductive reactance go up eight times by X(L)= 2

pi*F*L, but the capacitive reactance X(C)= 1/[2pi*F*C]

means the inverse C value for matching reactance goes

down 64 fold in comparison to original demands at 60

hz: thus effectively enabling sensibly tuned L1C1/L2C2

spiral arrangements. In a 0ne inch layer of of 9 inch

diameter, 2 inch ID spiral winds comprising four

layered spiral winds of some 120 winds, the value of

matching capacity of the 2.3 mh spirals was shown to

be ~7 ohms, some 44 uf of capacity. Such adjacent

spiral groups as adjacent sets were shown to have a

high mutual inductance, MERELY ON THE REACTIVE

READINGS ALONE! What this means is that according to

starting understandings the inductive reactance is

first measured at 7 ohms, but because the spirals

share almost complete coupling of flux change, the

adjacent presensce of the shorted secondary L2,

decreases the impedance measurement of L1 to be almost

half that of the former measurement, thus showing good

coupling in the reactive state. Thus based on the

readings of the new reactive state, each capacity of

the tuned L1C1/L2C2 combination would be also doubled

on first approximation, to comparative readings made

in isolation. That would be how things are tuned from

the data of interactions obtained from the reactive

state of mutual induction, which also predicts the

correct capacities to be used in the resonance,

however in some cases of resonance the mutual

inductance measured in the reactive state is different

from its resonant case. Thus a second approximation of

tuned L1C1/L2C2 values is in order when the mutual

cou-pling is not as great, to see whether the change

in both C values simultaneously to a higher value

according to an increased lenz law effect at resonance

comes into play.

Power transmission is easily possible through glass at

alternator frequencies, provided a correct match of LC

spirals is negotiated.

Sincerely HDN

=====

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