RE: Toroid Dimensions?

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

Original poster: "Mccauley, Daniel H by way of Terry Fritz <twftesla-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>



	Thanks for the great info!

	Dan


> Dan:
> 
> To provide an accurate answer we would need to know the dia. of your sec.
> coil.
> 
> For approx initial design the toroid to sec. dia. ratio should be around
> 2:1, ie, a 10 inch dia. coil would be fitted with a 20 inch dia. torus.
> Anything between 1.8 and 3.0 to 1 is an acceptable ratio.
> 
> The second design dimension is the ratio of the torus outer dia. to the
> dia.
> of the cross sectional area.  For example, with the above 10 in. dia sec.
> a
> 20 x 5 torus or 30 x 8 torus would work well.
> 
> These ratios usually run from 4:1 to as low as 2.5 or 3.0 to 1.  A ratio
> of
> 4:1 would require a mid size cap and matching pri while the low ratios
> would
> require a lot of pri cap and/or pri inductance to match up.
> 
> Going with the low ratio also allows you to drive the setup with a lot of
> power for large spark outputs while the higher ratio does not require as
> much power and is better for coils that are intended to be portable (you
> don't need the usual three gorillas to haul it to a local school).
> 
> These ratios will help you get started in the right direction.
> 
> Best regards,
> 
> Dr. Resonance
> 
> 
> 
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Monday, July 15, 2002 4:26 PM
> Subject: Toroid Dimensions?
> 
> 
> > Original poster: "Mccauley, Daniel H by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>
> >
> >
> >
> > Question regarding toroid dimensions??
> >
> > When selecting a toroid, any other dimension i should worry about?
> >
> > For example, say toroid X has dimensions 5" x 16" and its
> > capacitance is 20pF
> >
> > And toroid Y has dimensions 3" x 22" has capacitance 20pF
> >
> > Of course i'm just putting some arbitrary capacitance values here,
> > but given the same capacitance, what toroid would work better.  I know
> that
> > the larger the height dimension is, the higher the voltage the toroid
> can
> > hold before arcing.
> >
> > Thanks again.
> >
> > Dan
> >
> >
> >
> >
> 
> 
>