RE: [TCML] Toroid height, What's best

["Phil Tuck (hvtesla)" <phil@xxxxxxxxxxx>]

Steve wrote:  "the biggest effect will be to lower the apparent inductance
of the coil (which isn't a good thing really)"

So in effect moving the Toroid up or down would alter the resonant frequency
of the secondary/top load combination? If so I presume of little
consequence?

Regards
Phil

www.hvtesla.com

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Steve Ward
Sent: 25 February 2010 04:01
To: Tesla Coil Mailing List
Subject: Re: [TCML] Toroid height, What's best

The magnetic flux there is probably a lot more than you think... the
secondary being a solenoid tends to bring those flux lines all the way to
the top, making the "primary's" field extend much higher than it would
otherwise (you know that whole mutual inductance thing??).  Ive had toroids
run pretty warm to the touch from this, but thats on high-power solid state
systems, and by comparison to the total power level, it probably was pretty
insignificant as far as losses go.

But, since aluminum is indeed a pretty good conductor, even as a weakly
coupled shorted turn, the biggest effect will be to lower the apparent
inductance of the coil (which isnt a good thing really), which i think is
what Dex meant by "can be compensated for".

Steve

On Wed, Feb 24, 2010 at 6:12 PM, Lau, Gary <Gary.Lau@xxxxxx> wrote:

> A shorted turn is a loss, and there's no way to compensate for that.
>
> However, the losses induced by proximity of the toroid to the primary are
> negligible, unless it's within just a couple of inches.
>
> Gary Lau
> MA, USA
>
> > -----Original Message-----
> > From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> > Behalf Of Dex Dexter
> > Sent: Wednesday, February 24, 2010 2:37 PM
> > To: Tesla Coil Mailing List
> > Subject: RE: [TCML] Toroid height, What's best
> >
> >
> > So what?
> > You can compensate for shorted turn effect.
> >
> > Dex
> >
> >
> >
> > --- phil@xxxxxxxxxxx wrote:
> >
> > From: "Phil Tuck (hvtesla)" <phil@xxxxxxxxxxx>
> > To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
> > Subject: RE: [TCML] Toroid height, What's best
> > Date: Wed, 24 Feb 2010 01:06:44 -0000
> >
> > I have a 6 inch minor with the bottom 5.5 inches above the top of the
> > winding on my 8 inch. Runs on a pig with no problems. As I understand it
> you
> > get it as high as possible while still providing shielding. The lower it
> is
> > the more it acts like a shorted turn. My height was based on a
> > recommendation by Dr Res I thought.
> >
> > Regards
> > Phil
> >
> >
> >
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