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.
Chris----- Original Message ----- From: "bartb" <bartb@xxxxxxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx> 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). Regards, Bart 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... Regards, Chris_______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla
-------------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG - http://www.avg.comVersion: 8.0.169 / Virus Database: 270.6.17/1655 - Release Date: 05/09/2008 19:05
_______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla