Re: Flat Ribbon Primary Inductance Calculation (fwd)

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Original poster: List moderator <mod1@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Mon, 14 May 2007 18:05:57 -0700 (PDT)
From: Tim S <stm800@xxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Flat Ribbon Primary Inductance Calculation (fwd)

i noticed a minor flaw in the program
  if i enter my dimensions in inch measurements,
  at least is what i did do,
  click compute, it gives me an answer.fairly correct answer i admit is great.
   
  if i change a value ,say the pitch,,without resettting all the values back to nothing.
  the program continues to compute from some of the last variables.
   
  it caught me the first 3 times i tried it.
  then i realised what was going on.
   
  but not bad of a program.
  maybe i could add some data someday on bifilar wound wound types like this.
   
  i have wound some lately and past 3 years...
   
  tim

Tesla list <tesla@xxxxxxxxxx> wrote:
  Original poster: List moderator 



---------- Forwarded message ----------
Date: Mon, 14 May 2007 17:25:40 +0200
From: Kurt Schraner 
To: Tesla list 
Subject: Re: Flat Ribbon Primary Inductance Calculation (fwd)

Hi Bart,

thank you very much for estimating my efforts (and taking for serious), 
regarding the difference of flat ribbon primaries vs. round wire coils, and 
making the calculations avaliable within your extremely excellent suite of 
programs to our coiler society.

Have a good time, and best regards

Kurt

PS: hope, Gerry Reynolds, our "friendly list moderator" is OK, and will soon 
be here again.

> Date: Mon, 14 May 2007 00:04:53 -0700
> From: Barton B. Anderson 
> To: Tesla list 
> Subject: Flat Ribbon Primary Inductance Calculation
>
> Hi All,
>
> Today I threw together another javascript design tool to find the
> inductance for Flat Ribbon Coils (and yes it's quite different than
> round wire of the same thickness, pitch, etc..).
> http://www.classictesla.com/java/flatribbon/flatribbon.html
>
> I began with Grovers calculations and interpolations. I also looked at
> what Kurt Schraner had discovered in the Circular of the Bureau of
> Standards No. 74. Both Kurts and Grovers results were nearly identical
> (and a good crosscheck on Kurts calculations). Grovers calculations
> required 4 tables of lookup constants which was far more tedious than
> Kurts calculations. I therefore used Kurts discovered calculation as
> it was far easier to implement.
>
> And of course the program handles both metric and inches.
>
> Hope you find it useful in the future. The link is on my main page
> under "Javascript Design Tools".
>
> I'd like to thank Kurt Schraner for researching and putting together
> this calculation in an Excel spreadsheet for Flat Ribbon Coils. Very
> useful tool and well thought out.
> http://home.datacomm.ch/k.schraner/FlatRibbonCoil.zip
>
> Take care,
> Bart