Re: Flat-Copper-Strip Flat-Spiral-Primary Inductance Calc's ready

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

Original poster: "Kurt Schraner" <k.schraner-at-datacomm.ch> 

All,

metal ribbon type spiral primary inductance calculation is now available, 
in form of a zipped Excel, at:

http://home.datacomm.ch/k.schraner/FlatRibbonCoil.zip  (~57kB)

The calculations have also been integrated into my TC-design tool:

http://home.datacomm.ch/k.schraner/TCplan.zip  (272kB; now vers.2.00)

The calculation is now in excellent agreement with my
measured L values: about 1% average error above turn 2.
(Inductance meter is of insufficient precision below ~3uH)
A graph is at:

http://home.tiscalinet.ch/m.schraner/Lstrip_NBS.gif

...as before, calculation by the Wheeler formula, gives about 17% high 
values, compared to the experiments:

http://home.tiscalinet.ch/m.schraner/Lstrip_Wheeler.gif

A method, easier to implement, than the one in Patent:

http://hot-streamer-dot-com/TeslaCoils/OtherPapers/J-Reed/us5079482.pdf

...mentioned by Terry, was found in the famous NBS Circular 74 of 1918, 
Pages 250 to 262 + 285. It can be had at:

http://hot-streamer-dot-com/TeslaCoils/OtherPapers/Circ74/
(download Part5_10.tif till Part5_16.tif and Part5_27.tif)

I've not yet checked (i.e. vs. Antonio's INCA), if the method also works 
for the design of the very low, single turn primary inductance of modern 
solid state TC's (OLTC,DRSSTC), but may be...?

I'm also not certain about the higher frequency influence on the calculated 
values. Anyway, tapping my primaries of little twin UBTT, at the predicted 
turn values, seems to make perfect sense:

http://home.tiscalinet.ch/m.schraner/TwinWithRotaryinAction.jpg
(Pic shot by Urs Lauterburg at Physics Institute of University Bern)

BTW: a 27 page report about the UBTT (Uni-Bern-Tesla-Twin) is ready for 
download at:

http://home.tiscalinet.ch/m.schraner/UBTT-Betrieb.pdf  (4.4 MB)

Sorry, the report is in GERMAN language, and a little big. And thanks to 
Richie Burnett, allowing me the use of his classic TC explanation method 
and pic's in the report.

Best regards
                Kurt