[TCML] JAVATC primary inductance calculator
bartb at classictesla.com
Sat Sep 6 12:37:31 MDT 2008
This will also affect mutual inductance, but by how much, who knows. If
your down to 1uH, it's obviously a single turn ribbon. Based on your
previous data weeks ago and this time using only 1 turn, then about
1.15uH is what I showed. For any type of accuracy, best to rely on your
For lowering L, you could try 2 strips in parallel and measure. I'm not
sure how this will play out with a single turn like, but your meter will
Chris Swinson wrote:
> Hi Bart,
> I know JavaTC does not do flat ribbon, Though I was just going over my
> figures and noticed that ribbon had a totally different inductance
> than round conductors. It is something I do not realise before. Is
> this going to effect the mutual inductance figures if the primary
> value reads 4uH (not actual 1uH) ? Possible the mutual inductance
> figure maybe 4 times higher than I first thought ?
> The primary will still be 24" in dia (was even looking at 48"
> yesterday but changed my mind). 1uH is about the figure for 24" flat
> strip, However, I need even lower if possible. I am currently looking
> at 4 or 6" wide strap 0.035" (same as before).
> Though if yourself or anyone has any tips to lower the resistance or
> inductance then it would be of great help.
> For resistance, I can either have 3x 2" wide straps soldered totally
> together (will be messy!) or I could space them out a fraction to act
> as resisters in parallel. Though I am a little wary of linking
> resistors in parallel at such low voltages and such high currents.
> ----- Original Message ----- From: "bartb" <bartb at classictesla.com>
> To: "Tesla Coil Mailing List" <tesla at pupman.com>
> Sent: Saturday, September 06, 2008 2:31 AM
> Subject: Re: [TCML] JAVATC primary inductance calculator
>> Hi Chris,
>> From 4uH to 1uH is pretty extreme, but yes there is a big difference
>> between ribbon and round conductors. Javatc does not run ribbon style
>> primaries (yet). Your the one that pointed out the inductance
>> differential on your 4 turn ribbon primary. At the time I looked and
>> confirmed the difference myself, then wrote Paul. Kurt also verified my
>> numbers. Paul then went back and used four parallel wire filaments
>> spaced across the width of the ribbon, connected in parallel. He was
>> then able to get a reasonable number. But the initial try using a round
>> conductor showed the inductance far too high. Javatc simply cannot do
>> ribbons at this time.
>> Given that your primary previously was 18uH and now your talking about
>> 1uH, maybe you could share the new primary design specs (for a 2nd pair
>> of eyes to take a look).
>> Chris Swinson wrote:
>>> Hi Bart,
>>> In JavaTC I get 4uH primary inductance, but in your strap calculator I
>>> got 1uH.. I know the strap one is right, I know JAVATC is not
>>> crunching using strap, but just checking whets going on there it says
>>> the primary is 4uH which does not agree with the strap calculator even
>>> though I assumed a strap of 0.25" and dia of 0.25" in JAVATC...
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