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Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Hi, I bought some high frequency Litz wire, the outer diameter is around 1mm and it has 45 individually insulated strands. Do you think this wire will be better for winding a high frequency Tesla coil secondary than a solid conductor wire? The frequency would be in the few MHz range. Thanks
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
I do not know, but for general rf work it is considered that above about 500 kHz the value of litz wire decreases due to the extra inter-turn capacitance at frequencies of a few MHz hi-Q single-layer coils use space between windings of about 1 wire diameter this reduces inter-turn capacitance and most importantly proximity-effect, though a wire of twice the diameter with no spacing would give a better 'Q', with similar inductance, it requires 4x more copper.
So my guess is that Litz wire is not suitable for a TC secondary, MAINLY due to cost. Save it for winding power transformers in the 100's kHz range.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Sulaiman, thanks for the reply. I bought this wire for an experimental TC secondary in the first place, but if you say there is no advantage, I would rather keep it. I was mainly interested in decreasing the losses in the secondary so I could use smaller coils for higher powers. For this purpose I also bought a hard fiberglass tube which should survive very high temperatures.
Registered Member #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
personally i think it would work much better that a solid diameter wire save maybe copper tubing. the extra capacitance isnt so much of an issue in power apps as it is in signal integrity. especially in a tc primary, the added capacitance does nothing other than shift the resonant frequency a tiny amount. its insignificant compared to the primary capacitor.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
ben123324: well I was thinking about the secondary coil... I also think there could be a decrease in heating, but if its insignificant, I would rather save the wire for something else.
Registered Member #2939
Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
I'm in the process of making ~1000ft of litz for a TC secondary, partly because I happen to have a kg of 0.08mm (40 AWG) wire I bought surplus years ago. I'm fairly certain it will have a significant impact on secondary losses.
Registered Member #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
well, i still think it would work just the same. its the same physics going on. you might find that the added capacitance may be a viable alternative Steve Wards and Plasmatrons secondary capacitor. there really isn't any drawback i see other than bulk. but you would've already considered it of coarse. inter-winding capacitance really only hurts when you have a layered transformer where it can arc over.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
I'm mainly interested in decreasing the skin effect and eddy current losses from the primary magnetic field, in theory the Litz wire should be much better from this point of view. I think there will not be any difference in capacitances. I think I will try it after all...
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Litz wire secondary
