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Re: Transformer location/Safety
Original poster: "Neal Namowicz" <mr_neal@xxxxxxxxxxxx>
I'm just tossing a theory out here, but is it possible that there is
a material, or a material in a specific shape out there, that would
reflect the eddy current back up? I'm thinking, though, that could go
in at least one of two ways; overcoupling, or, achieving the same
results using a smaller than usual primary. Just a "layman's"
thoughts from one who's coffee hasn't completely kicked in yet. (jet lag :)
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
Sent: Friday, April 21, 2006 1:31 PM
Subject: Re: Transformer location/Safety
Original poster: "Gary Peterson" <gary@xxxxxxxxxxxx>
What is the shape of an individual eddy current? If it could be
seen, would it look like tapering tornado-like vortex, a sheet
rolled-up into a cylinder, or something else?
Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>
Eddy current losses ( circular in nature) induced in the aluminum
by the primary circuit could also increase losses from the
pri. The object is to keep as much energy as possible in the pri
and then couple it into the sec without "giving it away" in the
form of parasitic losses such as mounting metal components directly
under the primary when they do not have to be mounted there in the first place.
I agree with your excellent accessment of skin depth and it's effects.
Original poster: "Bob (R.A.) Jones" <a1accounting@xxxxxxxxxxxxx>
The shielding effectiveness of a infinite metal sheet to a magnetic field is
a function of the skin depth in the metal at the frequency of the magnetic
field. If the thickness of the sheet relative to skin depth is small the
shielding will not be effective. (say 10% reduction) If the thickness of the
metal sheet is large relative to the skin depth the shielding will be very
effective (say 90% reduction). From memory the skin depth in aluminum at the
usually Tesla coil frequencies is less than a 1mm so 1mm of aluminum sheet
should reduce the field to say less than 10%. Other factors such as joints
and size of the shield will have an effect as well.
Robert (R. A.) Jones
A1 Accounting, Inc., Fl
407 649 6400