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Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
StormInABottle wrote ...
Why would I do that when I can switch 80khz instead?
Well for starters . . .
1. Your magnetics, primary and secondary coils will be much smaller.
2. If you are audio modulating your coil, then at anything less than 3MHz you will hear an audible hiss from the harmonics of the switching frequency. At 4MHz and up, your arc will be perfectly silent and perfect for high quality audio modulation.
Registered Member #9252
Joined: Fri Jan 04 2013, 06:27AM
Location: Andromeda
Posts: 253
Did I mention that the primary is made out of normal wire. With rubber insulation? And I might use 10mm wire.. Because the mosfets can go until 13000+ watts. That is still experimental though. How can I spread the primary over the secondary ? As I heard space between primary windings are not a good thing And as I think. To make the coil draw more power then I need less primary turns.
Yes, the Q in my coil is probably a bit higher. The secondary inductance is around 160 mH according to JavaTC. The coil ran at 80 kHz.
From this, the tank current part in your coil would amount to V/(2*pi*f*L), which is 0.75A rms. The arc current part is P/V i.e. 7kW/60kV = 0.12A rms. That adds up to 1.2 A peak, which is somewhat below your measurement of 1.5A. I believe the difference is due to to the coils self capacitance, which makes the secondary base current a bit higher than from this calculation.
StornInABottle wrote:
I will use 34 awg if i find it. 30 awg if i don't find it..
Redoing the calculation for a 300mH secondary at 80kHz leads to a peak current of 0.73A. That dissipates 250W in a 1k resistance of an AWG34 coil. Low eddy current and resistance losses are conflicting goals in terms of wire diameter.
As I heard space between primary windings are not a good thing
I would say it is not a bad thing, often it's a solution.
I agree.. it could give interesting results! It would raise the coupling coefficient so you might need a larger Outer Diameter for your primary, but it could change the magnetizing inductance through to the secondary.
Registered Member #9252
Joined: Fri Jan 04 2013, 06:27AM
Location: Andromeda
Posts: 253
A 10 inch wide - 14 inch long wound with 34 AWG wire secondary has a Fres of somewhere near 56KHZ If i place an aluminum duct topload. The ducting itself is 3 inches wide. And the major diameter of the toroid will be 12 inches. How much would that drop the Fres
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Calculating a tesla coil's resonant frequency?
