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RE: True Toroid Capacitance



Original poster: "John H. Couture" <couturejh-at-mgte-dot-com> 


Bart -

Your JAVATC10 program is living proof that TC programs can be made to work
in spite of the fact that engineering texts say that Tesla coil design is
only empirical. The same is true for the E-Tesla6 program. If I had entered
the inputs correctly I would have obtained a much closer resonant frequency
to the actual test frequency instead of what I found.

  I checked your inputs shown below with my inputs and found that I had used
an input for the disk which gave a total secondary capacity that was too
high and resonant frequency too low. I agree that this disk should have been
left out of the inputs because it obviously does not affect the resonant
frequency according to the actual test results. I do have an old version
V6.11C of the program that I will replace with the V6.13C.

I believe you, Terry, and Paul have done a great job in putting together
some very complex TC programs. I am happy that the JAVATC and E-Tesla
programs are working so well together. Thank you for sending me the E-Tesla
inputs to check and correct my inputs.

John Couture

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


-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Thursday, November 06, 2003 9:59 AM
To: tesla-at-pupman-dot-com
Subject: Re: True Toroid Capacitance


Original poster: Bart Anderson <classi6-at-classictesla-dot-com>

Hi John,

 >However, this was at 229.58 KHz and not at the measured frequency of 238.25
 >KHz. I do not know why E-Tesla6 shows a different resonant frequency with
 >the same toroid and Sec inductance of 18.78 mh because the surrounding
 >conditions are the same.
 >
 >This new TC research needs to be verified with additional testing and all
 >comments are welcomed.


I just ran E-Tesla6 with your 18.78mH input:
C=23.29pF    F=240.65 kHz

Pretty close to Javatc and well within the margin of error against measured
to programs values for both programs. Is it possible you may be using the
old version 6.12? The current version is 6.13C. To check it, I've
copy/paste the output.txt file from my run with E-Tesla6 for reference. If
you see an input disagreement, that may also explain your numbers.

Take care,
Bart

-----------------------------------------------------
E-TESLA  V6.13C  July 26, 2003
Grid Size = 200.000000
Scale Multiplier = 1.000000
Terminated Coil
Ceiling Distance = 150.000000
Wall Distance = 103.000000
Primary Height (Inner Turn) = 13.835000
Primary Inner Diameter = 5.970000
Primary Outer Diameter = 13.950000
Primary Height (Outer Turn) = 13.835000
Strike Rail Height = 0.000000
Strike Rail Diameter = 0.000000
Secondary Base Height = 13.835000
Secondary Diameter = 4.538500
Secondary Length = 20.165001
Secondary Turns = 900.000000
Secondary Wire AWG Size = 24.000000
Secondary Inductance (mH) = 18.780001
Terminal-1 Height (center) = 36.500000
Terminal-1 Cord Diameter = 4.500000
Terminal-1 C-C Diameter (toroid only)= 14.750000
Terminal-2 Height (center) = 36.500000
Terminal-2 Cord Diameter = 0.000000
Terminal-2 C-C Diameter (toroid only)= 0.000000
Top Voltage = 100.000000
Pass     Ccalc (pF)          Change            Fcalc (Hz)
   1000   C=16.47939       Err%=1647839.375000       F=286089.34
   2000   C=20.13227       Err%=22.166338       F=258836.73
   3000   C=21.50607       Err%=6.823863       F=250433.13
   4000   C=22.16243       Err%=3.051977       F=246696.86
   5000   C=22.52905       Err%=1.654248       F=244681.34
   6000   C=22.75677       Err%=1.010779       F=243454.05
   7000   C=22.90824       Err%=0.665608       F=242647.84
   8000   C=23.01330       Err%=0.458590       F=242093.36
   9000   C=23.08799       Err%=0.324553       F=241701.45
10000   C=23.14191       Err%=0.233543       F=241419.72
11000   C=23.18114       Err%=0.169545       F=241215.31
12000   C=23.20989       Err%=0.123984       F=241065.92
13000   C=23.23097       Err%=0.090832       F=240956.52
14000   C=23.24648       Err%=0.066787       F=240876.09
15000   C=23.25791       Err%=0.049147       F=240816.92
16000   C=23.26634       Err%=0.036256       F=240773.28
17000   C=23.27256       Err%=0.026715       F=240741.13
18000   C=23.27715       Err%=0.019760       F=240717.34
19000   C=23.28053       Err%=0.014517       F=240699.88
20000   C=23.28305       Err%=0.010790       F=240686.89
21000   C=23.28485       Err%=0.007749       F=240677.56
22000   C=23.28618       Err%=0.005692       F=240670.70
23000   C=23.28714       Err%=0.004142       F=240665.73
24000   C=23.28785       Err%=0.003054       F=240662.05
25000   C=23.28840       Err%=0.002354       F=240659.22
26000   C=23.28870       Err%=0.001304       F=240657.66
27000   C=23.28901       Err%=0.001304       F=240656.08
28000   C=23.28917       Err%=0.000685       F=240655.25
29000   C=23.28927       Err%=0.000439       F=240654.73
30000   C=23.28932       Err%=0.000238       F=240654.44
31000   C=23.28935       Err%=0.000112       F=240654.31
32000   C=23.28937       Err%=0.000097       F=240654.19