Re: capacitance equation for toroids

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

Original poster: "Dr. Resonance by way of Terry Fritz <teslalist-at-qwest-dot-net>" <resonance-at-jvlnet-dot-com>


Inches is correct and thanks for the correction.  Working too late these
days!!

Dr. Resonance

Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo   WI   53913
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, June 06, 2003 8:24 PM
Subject: Re: capacitance equation for toroids


 > Original poster: "Mark Broker by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<mbroker-at-thegeekgroup-dot-org>
 >
 > Dan, I think you should look at the equations again....
 >
 > d/D > 0.25:  Cpf = (0.94 *d) + (0.584 * d)
 >
 > d/D < 0.25:  Cpf = 4.57 * (D-d) / ln (8 * (D-d) / d))
 > Another simple equation, although not as accurate (but close for most
 > sizes) is:
 >
 > Cpf = D + d / 2.56
 >
 > For a sphere the equation is Cpf = 1.4 * dia.
 >
 >
 > Let D = 1m (~39in), d = 10cm (~3.9in):
 > Cpf = 4.57 * (1-.1) / ln (8 * (1-.1) / .1)  = .96pF
 > Cpf = 4.57 * (39-3.9) / ln (8 * (39-3.9) / 3.9) = 37.5pF
 >
 > Wintesla gives 34.2pF
 >
 > I'd say the units are inches ;)
 >
 >
 > One error Dr. R's equations: the first equation should really be:
 > Cpf = (0.94 * D) + (0.584 * d)
 >              ^^^
 >
 > Regards,
 >
 > Mark Broker
 > Chief Engineer, The Geek Group
 >
 >
 > On Fri, 06 Jun 2003 10:20:30 -0600, Tesla list <tesla-at-pupman-dot-com> wrote:
 >
 > >Original poster: "Mccauley, Daniel H by way of Terry Fritz
 > ><teslalist-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>
 > >
 > >
 > >It doesn't matter its a ratio.
 > >Dan
 > >
 > >
 > >
 > > > Hi Doc!
 > > >
 > > > Is that measured in inches, meters, cubits, furlongs, or
 > > > nautical miles? ;-)
 > > >
 > > >
 > > > Matt D.
 > > >
 > > >
 > >
 >
 >
 >
 >
 >
 >