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RE: Sphere/Toroid Comparison Chart



Original poster: "John H. Couture by way of Terry Fritz <twftesla-at-uswest-dot-net>" <couturejh-at-worldnet.att-dot-net>


Kurt -

I agree the equations shown on my web site do not represent the table shown
below. However, for toroids above 20" large diameter there is a close
agreement. The graph I show in my books is based on my web site equations.
The graph covers toroids with large diameters from 10" to 80" and spheres
10" to 60". There are straight line curves for 3"-6"-12" and 20" small
diameter toroids. None of the curves overlap.

The equations were shown in the Tesla Coil Builders Association Newsletter
Vol 6, #2. The graph was made several years ago using the Quattro Pro
program. The graph shows isotropic capacitances which have to be reduced a
certain percentage when the toroid is placed on the secondary coil. I
estimated the percentage reduction should be about 20% but this may be too
high. Terry's E-Tesla6 program will certainly give a more accurate
capacitance because it takes more of the surrounding variables into
consideration. I will send you a copy of the graph if you send me a stamped
self addressed envelope.

John Couture

--------------------------------


-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Tuesday, May 08, 2001 12:25 PM
To: tesla-at-pupman-dot-com
Subject: Re: Sphere/Toroid Comparison Chart


Original poster: "Kurt Schraner by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<k.schraner-at-datacomm.ch>

John C., Matt D., Terry-

John, your posting has made me to take another look at the table, Matt
D. has posted Thursday, May 03, 2001. I need to point to two facts, in
case, somebody likes to make use of this table. In any case, however,
beeing it a toroid or a sphere in TC use, I would rather prefer, to make
the E-Tesla6 calculation. The 2 facts are:

1.) Error here, in definition of diameter: NOT center-center, but
outer (maximal) diameter of toroid!!! (plausibility: Bert P.'s Eqn.)
   
   V
> C-C        Chord Nom.
> Toroid     Toroid     Cap       Equiv.Diam. Equiv.Diam.
> d1(inches) d2(inches) pf       sphere (in.)  sphere (m)
>
> 8          4.00     7.723          5.47      0.1390
> 8          6.00     4.540          3.22      0.0817 not feasible
> 10         4.00     10.675         7.56      0.1921
> 10         6.00     8.243          5.84      0.1484 not feasible
> 12         4.00     13.262         9.40      0.2387
> 12         6.00     11.585         8.21      0.2085
> 14         4.00     15.574         11.04     0.2803
> 14         6.00     14.605         10.35     0.2629
> 16         4.00     17.675         12.53     0.3181
> 16         6.00     17.359         12.30     0.3125
> 18         4.00     19.607         13.89     0.3529
> 18         6.00     19.893         14.10     0.3581
> 20         4.00     21.402         15.17     0.3852
> 20         6.00     22.245         15.76     0.4004
> 22         4.00     23.083         16.36     0.4155
> 22         6.00     24.444         17.32     0.4400
> 24         4.00     24.668         17.48     0.4440
> 24         6.00     26.512         18.79     0.4772
> 26         4.00     26.170         18.55     0.4711
> 26         6.00     28.469         20.18     0.5124
> 28         4.00     27.601         19.56     0.4968
> 28         6.00     30.329         21.49     0.5459
> 30         4.00     28.969         20.53     0.5214
> 30         6.00     32.103         22.75     0.5779

2.) John, I was not able to find a satisfactory way, using the equations
I find on your website, to represent the above table (trying quite a
number of some possible input data errors about C-C vs. outer d1).

Cheers
       Kurt Schraner


Tesla list wrote:
>
> Original poster: "John H. Couture by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <couturejh-at-worldnet.att-dot-net>
>
> The overlap is not a problem with the Toroid Capacitance Graph I show in
the
> Tesla Coil Notebook because I did not use Bert Pool's equation. The
> equations I used are shown on my web site. Look for  Secondary Terminal at
>
> http://home.att-dot-net/~couturejh/
>
> John Couture
>
> --------------------------   snip