Re: eddy current with secondary coil

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

Original poster: "Malcolm Watts" <m.j.watts-at-massey.ac.nz> 

Hi Chris,

On 14 Oct 2003, at 13:32, Tesla list wrote:

 > Original poster: "chris swinson" <exxos-at-cps-games.co.uk>
 >
 >
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Tuesday, October 14, 2003 6:34 AM
 > Subject: Re: eddy current with secondary coil
 >
 >
 >  > Original poster: "Malcolm Watts" <m.j.watts-at-massey.ac.nz>
 >  >
 >  > On 13 Oct 2003, at 14:34, Tesla list wrote:
 >  >
 >  >  > Original poster: "chris swinson" <exxos-at-cps-games.co.uk>
 >  >  >
 >  >  > Hi all,
 >  >  >
 >  >  > If larger Dia wire gives a larger surface area ( good for reducing AC
 >  >  > resistance ) then wouldn't the eddy currents be also greater also 
which
 > is
 >  >  > reducing the Q ? Comments ?
 >  >
 >  > Are the turns shorted?
 >  >
 >
 > What would be the use in a coil with shorted turns ??? It would just be a
 > very large copper pipe in that case, I assume there is catch or this is a
 > trick question ??
 >
 > chris

To an extent. Unless the turns are shorted, eddy currents should be
as good as non-existent. The fact is, the Q goes up as wire size is
increased and plateaus as the L/C ratio degenerates.

Malcolm