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Registered Member #2838
Joined: Fri Apr 30 2010, 07:55PM
Location: tehachapi, CA
Posts: 333
Hello, I've been searching online... And I cannot seem to find any info for my question... Despite the fact that I am certain that someone has tried this...
Has anyone wound a 'traditional' secondary "Tall PVC form" (example: 4"x18") as a bifilar style coil?
I would love to see any info that anyone may have...
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
No answer for a while so I thought I'd pitch in,
I see no advantage to making a bi-filar coil as opposed to mono-filar as for the same amount of copper (cost) a single wire 1.414 times the diameter of the bi-filar wire would have about the same resistance but be 71% of the length of the bi-filar coil for the same number of turns, so self-inductance would be higher (higher L/R is good)
In theory a spaced winding (e.g. space between turns = wire diameter) (I wound one wire bi-filar with a nylon fishing line of about the same diameter) gives a higher 'Q' coil hence the possibility of higher voltages, but for a TC where the desired arcs/sparks heavily load the secondary there's not much to be gained and the higher resistance (e.g. compared to the same coil but with twice the diameter copper and no space) would result in more power going to heat the secondary rather than the arcs.
ALSO compare winding say 1000 bi-filar turns of 0.2mm diameter copper wire to 1000 turns of 0.4mm diameter copper wire.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
I think this might have advantage in high-Q tank circuit Tesla systems (such as VTTC, DRSSTC) in that it could reduce secondary heating due to eddy current losses. From my previous research, eddy current losses may be the main contributor to secondary coil heating in the mentioned coil types.
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Bifilar Secondary question
