Re: [jlnlabs] TESLA COIL REVISED (Litz wire)

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

Original poster: "RIAA/MPAA's Worst Nightmare" <mike.marcum-at-zoomtown-dot-com> 

Oops I overlooked that. That's actually what I was thinking (higher
Freq=shallow skin depth, less cross-section being used). I was mainly
looking at the comparative graph near the bottom.

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, January 02, 2004 10:57 PM
Subject: RE: [jlnlabs] TESLA COIL REVISED (Litz wire)


 > Original poster: "Lau, Gary" <gary.lau-at-hp-dot-com>
 >
 > Re. Litz wire, NO, that's not at all what I
 > measured/suggested/concluded.  What I measured was that the particular
 > wire that I tested had a higher AC resistance than several other
 > conductor types at higher frequencies.  At frequencies below 120 KHz,
 > the Litz was actually the best conductor that I tested.  And I concluded
 > that the higher resistances at higher frequencies was due to the
 > relatively coarse (#30 AWG) stranding of the particular wire that I had
 > on hand.  I indicated a link to a Litz wire manufacturer's site where
 > strand size vs. operating frequencies are recommended.  Had I had access
 > to a thinner stranded wire, I have no doubt that the Litz inductor would
 > have had the lowest AC resistance of all.
 >
 > Litz wire is GOOD for use in Tesla coil primaries, although the
 > difficulties of tapping it are obvious.  The take-home lesson from my
 > experiment is that the proper strand size for the operating frequency
 > must be observed.
 >
 > Gary Lau
 > MA, USA
 >
 >
 > Original poster: "RIAA/MPAA's Worst Nightmare"
 > <mike.marcum-at-zoomtown-dot-com>
 >
 > Here's a link http://users.rcn-dot-com/laushaus/tesla/primary_resistance.htm
 > where several different primary inductor topologies and material
 > combinations were tested for gain/dc resistance/ac resistance, but at
 > most
 > TC frequencies copper litz wire is actually one of the worst things to
 > use
 > for a conductor and only gets worse as the frequency rises. I have yet
 > to
 > reason why since it's meant for RF apps. I wouldn't have believed it if
 > I
 > didn't see it.
 >
 >