Re: Objections to Steel Wire?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Kurt Schraner by way of Terry Fritz <twftesla-at-qwest-dot-net>" <k.schraner-at-datacomm.ch>

Hi all,

it might be remembered, that skin effect is not only depending on 
resistivity of the conducting material, but as well on permeability. A 
useful formula for skin depth is:

Skin depth d  = SQRT ( 2 * Rho / (Omega * mueo * muer))

d = skin depth in [mm]
Rho =  specific resistivity [ohm*mm*mm / m ]
Omega[1/s]  = 2*pi* f [Hz]
mueo = 1.2566E-6 [H/m] permeability of the vacuum
muer =  relative permeability of  conductor [-]

For most conductors the relative permeability is close to one. Not so 
for iron. This means, 'cause muer is in the denominator, it tends to 
decrease skin depth (the higher Rho of iron tends to compensate in part 
for that). I wouldn't use iron as a coil wire, not only because of high 
resistivity, but as well because of high relative permeability.

Kurt

Tesla list wrote:

>Original poster: "harvey norris by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <harvich-at-yahoo-dot-com>
>
>Hi TC Builders
>I noticed on the "new to the group" thread that he was
>using steel wire. Some Tesla texts suggest that any
>kind of iron influence would be detrimental to
>performance. Is this permissable in the wire itself?
>Thanx HDN
>
>=====
>Tesla Research Group; Pioneering the Applications of Interphasal Resonances
>http://groups.yahoo-dot-com/group/teslafy/
>
>
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