Re: Transformer location/Safety

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>




Why bother?  Just place your power supply several feet away and 
completely eliminate the problem. The K-I-S-S technique always works the best!

Dr. Resonance


> Dr. R.:
> 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 :)
>
> Neal.
>
>
> ----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
> To: <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?
> >
> > Gary Peterson
> >
> > > 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.
> > >
> > > Dr. Resonance
> >
> >
> > > > Original poster: "Bob (R.A.) Jones" <a1accounting@xxxxxxxxxxxxx>
> > > >
> > > > Hi,
> > > >
> > > > 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