Re: Flat Ribbon Primary Inductance Calculation (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: List moderator <mod1@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Tue, 15 May 2007 22:09:25 -0700
From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Flat Ribbon Primary Inductance Calculation (fwd)

Hi Tim,

Hey, I think Kurt stumbled on the same thing using the cm units. If you 
recalc the same values, the numbers start going really high. If that is 
what you were saying, then yep, that was a problem. Took only a few 
minutes to fix. I had ported some code over from another program and a 
remnant that should not have been there was causing that problem.

I also found I needed to refresh the input values at the beginning of a 
run. Something I normally do, but didn't for some reason.

Anyway, it should be ok. Thanks for making me aware.
http://www.classictesla.com/java/flatribbon/flatribbon.html

BTW, that wasn't a minor flaw but a major one. Everytime you calc 
numbers, they are suppose to be correct each and every time. Hopefully, 
that is the case now.

Take care,
Bart

PS. If you load the page again and you get the same results, the browser 
may be using the old cached script. Just hold the shift key and click on 
reload to ensure everything is reloaded.

Tesla list wrote:

>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 
>>    
>>
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