FW: Mutual Inductance & K Factor (was : Arc Over Between Secondary and Primary Coils)

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

Original poster: "John H. Couture by way of Terry Fritz <twftesla-at-qwest-dot-net>" <couturejh-at-mgte-dot-com>


Bart -

For Nolan's coil and your Java9.1 program.

Secondary  2.375 - 12.75 - .014705 - 0 - 0
Toroid     9.1 - 3.375 - 0 - 0
Primary    5.2 - .180 - .25 - 3.8368 - 0 - .03 - 0

Outputs  Fr = 470.08  Lm = 17.72  K= .1035
         Lp = 3.82    Ls = 7.67
         Pri turns    3.84
         Sec turns    867.1
         Turns per Inch = 68

With Sec above Pri = 3
         Lm = 3.66     K = .0213

There are big differences between the Lm and K values for the Java9.1 and
JHCTES programs. Only proper testing will solve the problem. The tests
should include separate tests for the Lm and the K Factors. For the Lm
(mutual inductance) the 2.65 amps in the primary will give a direct reading
in microhenries. For the K Factor the Frequency test is best
      K = sqrt(1- (Fo/Fs)^2)
These are standard tests and are also shown in my books. The books and
JHCTES Ver 3.3 program can be found by clicking on
             www.mgte-dot-com
Click on TESLA then Books

John Couture

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


-----Original Message-----
From: John H. Couture [mailto:couturejh-at-mgte-dot-com]
Sent: Saturday, March 16, 2002 9:08 PM
To: Tesla list
Subject: RE: Mutual Inductance & K Factor (was : Arc Over Between
Secondary and Primary Coils)


Bart, Nolan -

I goofed, sorry. Ignore my other posts, I was using Ls = 93.79 instead of
9.379 mh.

For Nolan's coil I get the following with the JHCTES Ver 3.3 program.

Secondary   1.19 - 867 - 68 - 0 - 10
Primary      .03 - 3.30 - 0 - 1.4

Outputs Fr = 470.91 Khz   Lm = 33.24 uh   K = .194
        Lp = 3.81 uh      Ls = 7.7 mh
        Pri turns = 3.82
        Sec turns = 68 TPI x 12.75 Lgt = 867
        Pri/Sec clearance = 1.41 inches
        Pri inside rad = 2.6
        Pri c/c turns  = .37


With Sec above Pri = 3
        Lm = 14.16 uh      K = .083

It will be interesting to find the true mutual inductances and K Factors if
Nolan tests his coil for these two parameters.

John Couture

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


-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Saturday, March 16, 2002 12:07 PM
To: tesla-at-pupman-dot-com
Subject: Re: Arc Over Between Secondary and Primary Coils


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

Hi John, Paul, Nolan,

Nolan, hope you don't mind if we play around with the numbers. Also, can
you verify something. Is your
secondary 15" high wound with 28 awg with a winding length of 12.75"? If
so, I used 15" previous, so
all the numbers will be off, but it's a good exersize anyway.

John, on the helix -3.000 value, I used a wrong input. However, I see what
your getting at.

Paul, Acmi appears to not equate correctly using Acmi's own inductances and
K. I think John is correct
here. I will go back and check my inputs to see if I made some error. Maybe
you can take a look at the
input file I sent.

I'm pretty sure Nolan's secondary is 12.75" high and not 15". I'll go back
through these today with
this new secondary length. If you can check with the 15" length anyway, I
think all the other inputs
were correct.

Take Care,
Bart