Re: JavaTC Major Update version 9.0

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

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi John - 

I sent you an email off-list about a week ago, but guess you didn't get it. It
was regarding the JHCTES 3.3 1000 turn example coil. JHCTES calcs a mutual
inductance at 243uH. Both Acmi and JavaTC calc'd 188uH for the same coil
parameters. 

Having been part of the testing for Acmi, I know first hand how well it will
calc your example coil to less than a percent. This type of geometry is a
highly accurate. 

You menioned a JHCTES example at 500 turns with 4" primary spacing calc'd
negative values? I didn't get negative values in any of the 3 programs. 

Inputs for JavaTC and Acmi for the secondary is 6 x 11.365, .0201 wd, 500 turns
(44tpi). Primary was 14 od (4" pri to sec spacing), 4.8487 turns, 0.25 wd, 0.25
sp (tuned for 0.02uF). This equates to av. radius of 8.09" and width of 2.17"
in JHCTES. 

    SCNY.L| SCNY.R|    PRMY.L| PRMY.R|SCNY-PRMY.M|SCNY-PRMY.K 
  16.05 mH|  20.38|  17.45 uH|   0.00|   78.76 uH|     0.1488 Acmi 
  16.00 mH|  20.17|  17.35 uH|   n/a |   79.52 uH|     0.1509 JavaTC 
  16.00 mH|  n/a  |  17.95 uH|   n/a |  102.48 uH|     0.191  JHCTES 

There two differences here between our programs. One is self C, which we both
already know affects Fres and pulls tuning to slightly different values
affecting Lp. But this is only a slight difference which affects K. Mutual
inductance is another now another difference. Because of the first, your tune
input is 4.93 vs 4.8487. However, even at 4.93, mutual inductance is 80uH, so I
think JHCTES is actually high in this portion of the program. 

Take care, 
Bart 
  

Tesla list wrote: 
>
> Original poster: "John H. Couture by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <couturejh-at-mgte-dot-com> 
>
> Bart - 
>
> Congratulations on the new version of your Java 9.0 TC program. The program 
> is getting better with every new version. I was particulary interested in 
> the mutual inductance and K factors  outputs. Both of these parammeters are 
> low in your program compared to the JHCTES Ver 3.3 program. In fact they 
> appear to be too low. When I entered 500 turns and 4 inches Pri/Sec distance 
> for the JHCTES default example I got negative numbers for both the mutual 
> inductance and the K factor. I wonder if the Acmi program has this problem. 
>
> As I have said in the past developing TC programs is not easy. There is an 
> astronomical number of possible parameter combinations which makes finding 
> the bugs a very difficut task. It is obvious that using the minimum number 
> of parameters is a great advantage. However, this means that the program is 
> less useful. A program with more parameters gives you more information and a 
> greater insight into the working of Tesla coils. For example I doubt that 
> any coiler can tell you what happens to the K factor when the primary 
> capacitor is changed which changes the primary turns. Unless of course he 
> has a program like yours or mine to check it out. 
>
> Our programs are based on test data so many more proper tests are required 
> before the programs can be made more accurate. 
>
> John Couture 
>
> --------------------------------- 
>
> -----Original Message----- 
> From: Tesla list [<mailto:tesla-at-pupman-dot-com>mailto:tesla-at-pupman-dot-com] 
> Sent: Sunday, March 10, 2002 5:13 AM 
> To: tesla-at-pupman-dot-com 
> Subject: JavaTC Major Update version 9.0 
>
> Original poster: "Barton B. Anderson by way of Terry Fritz 
> <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net> 
>
> Hi All, (Terry, long due to data inserted). 
>
> Major updates to JavaTC Designer. Version 9.0 has been uploaded: 
>
>
> <<http://www.classictesla-dot-com/java/javatc.html>http://www.classictesla-dot-com
>
/java/javatc.html><http://www.classictesla-dot-com/j>http://www.classictesla-dot-com/j
>
> ava/javatc.html 
> If you dont' see "JavaTC 9.0", reload your browser. 
>
> Changes to v9.0: 
> ***************** 
> Added Mutual Inductance and Coupling Coefficient as part of the design 
> process. 
> This institutes an added input box in the Primary Coil Design for Primary 
> Height (inner turn in reference to the secondary bottom turn). At the bottom 
> of 
> this post is "data" reflecting JavaTC run against ACMI. 
>
> ------------------------   snip