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Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Hello everybody :D
What will be diferend, if i use 0,06mm wire for secundary ? (f will be lower) and spark ? coil P=600W, half-bridge, IRFP460 mosfets, secundary size: 8cm diametre, 33cm tall. any ideas?
Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
0.06mm wire sounds adventurously thin for anything but the tiniest secondary.
With 0.15mm wire, running 50W at 4MHz caused the former to get hot, and melt. Most of the heat seemed due to dielectric interaction with the PVC former, but just be aware that things will get hot.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
I don't think you will be able to wind that by hand, except on a very small former and nerves of steel - you'll have to build a machine to do that for you.
I never tried anything thinner than 0.1mm yet - I just never needed.
Registered Member #514
Joined: Sun Feb 11 2007, 12:27AM
Location: Somewhere in Pirkanmaa, Finland
Posts: 295
Linas wrote ...
so what diameter of wire and turns should be to get longest spark ? (33cm tall and 8cm diameter)
Lower frequencies seem to grow longer sparks... See all those MHz coils that manage 3" with >1kW.
That said, making a 33cm resonator with 0.06mm wire sounds a bit suicidal. The DC resistance will be huge and will heat up significantly at high powers. IRFP460s are pretty fast devices so the ultra low frequency won't make much difference. It would be good if you used some monsterous slow IGBTs, but with 460s its not really needed.
For 460s I'd aim for 250 - 400kHz with 0.25 wire.
If you have the patience, go for it and post the results here.
Registered Member #76
Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458
mh, i wound a drsstc secondary with 0,1mm and it seemed to work fine. i managed to get sparks 4 times longer then secondary height. but its a pain in the ass to wind.
i already wound a secondary with 0,05mm wire a few years ago for a small 12 volt powered sstc and it worked! . but... if you wind that on a large former you will give up after a few minutes. as i wound the secondary which was around 5cm in height and 15mm in diameter i used a "glass" to see what im doing (didnt find the word..those glass thingys where you look through and see everything many times bigger :PP lol)
with the plain eye you wont be able to see turns crossing each other etc. and, you cant feel it by hand. this wire is thinner than a human hair and it breaks with around 10gram attached to it. . so, if you dont have a many thousand dollar machine to wind this coil for you, dont try it. you wont be able to do!
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
The smallest I've ever used is 0.125mm. It gave a resonant frequency of about 160kHz, which gave good results on my DWSSTC. The low resonant frequency makes it much easier to drive. I wouldn't have had the patience to wind anything finer!
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secundary from 0,06mm wire :)
