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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