Toroidal Coils

[Dave45]

I like your coil designs Iv been playing with spoked coils or rodin type coils as well.
I wonder if we ran the current through the spoked coils first then into the driver circuit would the spoke coils oscillate on the backside of the driver.

[d3x0r]

I have 2 'inner' coils in this one. 
The red rope winding is 'the new winding'
The RedGreen is an inner of the new winding, it's a inner-core coil.
The white/blue/red coil in the center is just inner coil.


New winding, is 31 feet (plus a little for padding), 24 filaments of 28GA wire.
I connected 2 sets 12 filaments in series.
On the 6" diameter windings, one series filament measures  inductance of 8.(1?)mH and 30.(2?)mH together.


The inner-core coil is 70uH.


When open the new winding is stealing almost all of the signal from the inner red/green core! HELP!


The complexity of the coils is starting to require fore-knowledge of design.


Inner-core coil, driving; new winding picks up +/- 700V resonance at about 4Khz.


new winding driving had issues; had to increase the power supply inductance; used a ignition coil secondary for the inductance, and smoothed out the drive.  .. I dunno I oscillated, not at a super high voltage I guess...


so I reverted the power inductance since that was much too much for the other coils to be in the mazilli driver.


Maybe I should just jump to now.


I put the configuration back; I ended up having to use a ferrite core, because the resonant frequency difference is so very large.... when I drive the inner coil (white winding only, 24 turns total), I induce a high voltage in the new winding.  But it doesn't behave the same as before... I can't get a usable differential from it... that is I can't ground the clockwise side and the counter clockwise of the other and get a +/- delta on it... the ends are in-phase.   I still pickup some voltage on the inner-core coil, but not enuogh to drive the LED load.  Even leaving the new winding totally open, I cannot get enough drive on the inner-core coil;  what I do get is strong ozone from the ends of the open winding; so I'm getting a huge power loss there apparently.


So; the new winding has destroyed the ability to use the prior configuration.


There is quite a current of high voltage also, got some pretty good arcs through the tips of my fingers accidentally brushing a ground.


So... this doesn't really answer my questions


1) is it better to drive with an inner-core coil or an inner coil; really either is sufficient (?)


but, then I can't also use the inner coil to drive the new winding and the inner-core coil... So I think this is where the intersection should be I guess.


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To go back to akula's device....
A, a driven coil at X frequency, inside a pickup coil... Since the inductance of the secondary becomes the significant resonant point with the mazilli, it's the frequency of the secondary, which is inside the load coil.
B, a driven coil at 3X frequency, at a higher voltage potential (tesla tower), is outside of the load coil.  These two intersect on the pickup coil.


-------------------
This would mean... a inner coil (maybe an outer coil; not outer-core; above/below?)  of 12 turns, which excites an outer-core winding of high inductance


around the inner coil put another coil that has the voltage pickup on the outside, and 1 or 2 inner-core coils...


But then frequency becomes the problem... seems like coils have a frequency with or without capacitance, that adding capacitance just reduces.

[d3x0r]

New coil; video...

https://www.youtube.com/watch?v=k7z_QhLDDQk

[d3x0r]

Two seperate coils are reversable without opening them.
Originally the thin rope winding was on the outside, but tinkering I ended up with it on the inside.. then reversed it back out, and spread out the inner... and the ends were soldered together... actually becuase of the knotting of the coil, it's impossible to slip one through the other even if the ends were open.


I'm pretty sure if 3 coils were all interwound, they would all be interchangeable in position.

[d3x0r]

Hmm... I guess I never included schematics here...


I have falstad sim...

falstad sim