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Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
Either way, if he's putting 120/250v into I think its 24AWG wire thats that closely wound, the wires are gonna get a bit toasty and most likely the enamle will start to melt possibly fusing the wires together. IF its HV arcing I'd say some of the enamle got wore off and is allowing it to arc.
Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
For high-voltage coils, you should wind them neatly and precisely, turn by turn, on a proper former.
Instead of jumble-winding, try winding each turn down sequentially, so the lowest potential is at the bottom of the former, and the highest potential is at the top, much like a tesla coil.
If there is 9kV across the coil at a sufficiently high frequency for the coil impedance to appear great (hence the arcing), then I don't think multiple layers will be easy to insulate, either. It might be easier to stick to a single layer for now.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Yeah, the problem is that the voltage is high and that wire only has thin insulation, and the end of the coil could have ended up next to the beginning. You ought to try winding it all in one layer like a Tesla coil, as blackplasma suggested.
The work coil on my first induction heater was a mess like that, but I got away with it because mine was driven by a solid-state generator instead of HV pulse discharges, so it only saw about 300V, instead of 9000.
Registered Member #577
Joined: Sun Mar 11 2007, 11:48PM
Location:
Posts: 26
i made a new coil it has 24 turns and it works better than all the rest but not quite at the red hot in 15 sec speed but it gets pretty hot after 3-5 min. the turns are all vertical so i have a tall coil.
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coil problem
