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

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

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

Thanks Terry,

this looks very promising. And old guys like me love Fortran!!! ;-)

Cheers,
         Kurt

Tesla list schrieb:
>Original poster: Terry Fritz <teslalist-at-twfpowerelectronics-dot-com>
>Hi Kurt,
>You may want to check out the patent J. Reed had a hand in:
>http://hot-streamer-dot-com/TeslaCoils/OtherPapers/J-Reed/us5079482.pdf
>The program given may help.
>Cheers,
>         Terry
>At 08:35 AM 8/31/2004, you wrote:
>
>>Hi Finn,
>>
>>of course i've tried Antonio's INCA for the problem. I "think" it has the 
>>capabilities in it, to resolve the problem. But right now, the results 
>>were about same as the wheeler formula. There is no input parameter about 
>>axial extension of the conductor in flat configurations, but perhaps, by 
>>implementing parallel filaments, it could be introduced?
>>...Or I don't see, what is already present in INCA?
>>
>>I agree, measuring low inductance with an LCR-meter may not be as 
>>accurate, as measuring it by means of a resonance method. But in the 2 
>>graph-links of my last posting, it may be noticed that the _difference_ 
>>of the measurements in the copper strip case is systematic, but not so in 
>>the wire-case. I have many other primary measurements with the LCR-meter, 
>>which support the reliability of the measurements, if L is not less than 
>>about 5...10uH.
>>
>>Cheers,
>>         Kurt
>>
>>Tesla list schrieb:
>>
>>>Original poster: "Finn Hammer" <f-h-at-c.dk>
>>>Tesla list wrote:
>>>
>>>>Original poster: "Kurt Schraner" <k.schraner-at-datacomm.ch>
>>>>Hi,
>>>>
>>>>anybody has handy a good method or formula for inductance calculation 
>>>>of  flat-strip flat-spiral primaries? I made one for my little UBTT 
>>>>(Uni-Bern Tesla Twin), which primary can be seen here:
>>>>snip
>>>
>>>
>>>I used Antonio`s INCA program to calculate the 2-turn primary of my 
>>>OLTC. It was the only program that got close to so small an inductance. 
>>>I`m not sure if this has to do with it being a flat strip primary, but 
>>>it`s worth a try.
>>>
>>>>The inductance measurements were done at 1000Hz, with a digital 
>>>>LCR-meter of the "automatic bridge type" (ESCORT ELC131D, Taiwan).
>>>
>>>
>>>I would not rely on that meter, with so small inductance, before having 
>>>verifyed the measurement with a capacitor across the coil, and then ring 
>>>it up with a sig. gen. waching it with a scope.
>>>My 5 oere
>>
>