Radiant Bifilar Tesla pancake Coil specs, for easy reference


Radiant Bifilar Tesla pancake Coil specs, for easy reference
«  »Last edited
L1=L2 :

739pF    0.34 mH    0.5 Ohm

made from 12.5 meter 1.5mm2 speaker wire. oxygen free pure copper.
24cm total diameter
5.8cm inner hole diameter.
9.1 cm coil width.

inner diameter made by 13cm free end (for series connecting windings), then 18.2cm into a circle, as the 5.8cm inner hole.
coil mass
« Reply #1,  »Last edited
10cm of 1.5mm2 speaker wire (2 wires)
has a copper mass of 2.62 gram

so a 12.5m coil has a copper mass of 327.5 gram

10cm of 2,5mm2 speaker wires (2 wires)
has a copper mass of 4,55gr
3.27.5 : 4.55= 71.978

So a 7,198 meter 2,5mm2 coil has equal copper mass as a 12,5m 1,5mm2 coil
L3 specs
« Reply #2,  »
7.198 meter speakerwire.

capacitance= 332pF
resistance=0.2 Ohm
total diameter=29.6 cm
inner hole diameter=2.1cm
New L1 coil, with distanced windings
« Reply #3,  »Last edited
I'm going to make a new 2.5mm2 bifilar coil.
This time I will separate the windings.
This coil will be used as an L1 coil.

The goal, is to still magnetically couple the windings (mutual inductance), but distance them enough, to reduce the capacitance. This will raise the resonant frequency of the coil, which then makes a much faster impulse possible (shorter duration).

As the back emf impulse, also creates a very temporary dielectric field in L1, it will create longitudinal pressure.
The distance between the windings, will make the volume of Aether bigger. Which hopefully will create more inertia effects.

(2x) 7.198 meter speaker wire.
5.8cm inner hole diameter

I first separated the 2 wires of the speakerwire.
then rolled them stacked together, on a rol of tape.

hot glued both (outsides) of the coil.

then separate the 2 windings, and glue the other sides.

this way the windimgs will still be equal im size and windings. I could also glue them with a dielectric together like silicone.
But I have to thing about this.

First I want to measure at what distance the inductance is being coupled.
I will do this with nylon rings im between the windings, and measure the inductance at several distances.

I could also measure capacity, but this would be changing if I add a dielectric. I intend to use silicone as a glue (with nylon rings for spacing)

 20190719_160430.jpg - 5671.67 kB, 4032x3024, viewed 2 times.

new L1 distance reading
« Reply #4,  »
I made the new L1 windings, and made several measurements, while having them at variable distances (by using nylon rings).

Rings      distance    inductance   capacitance
stacked    in mm         mH               pF
0               pvc            0,12            232 
1               2.5            0,12            107
2               5               0,11             62
3               7.4            0,11             51
4               9.8            0,11             41
5              12.3           0,10             35

As expected, the inductance barely shanges, but the capacitance quickly drops. I guess I need a distance of maximal 2 rings, as I still need some dielectric coupling. The silicone will increase it some more.
Since I am limited to 1200V impulses by the SiC mosfets, will use 2 rings, 5mm distance between the windings. filled with silicone.
New L1 with 5mm silicone
« Reply #5,  »Last edited
smells terrible :(
will do measurements of inductance and capacitance when the smell disappears

 20190719_231638.jpg - 3804.88 kB, 4032x3024, viewed 4 times.

L1 measurements
« Reply #6,  »Last edited
the new L1 is 5mm distanced by white silicone kit, and nylon rings(to keep equal distance). both pretty good dielectrics.
Before, with only the nylon rings, I measured:
0,11mH inductance and (only) 62 pF capacitance. (and 0,3 Ohm)

Now with  the white silicone kit:
0.12mH inductance, and 134pF (and 0.2 Ohm)

The original L1 coil, that produced 500nS impulses had 232pF of capacitance and 0.12mH inductance.

The reduced capacitance in the new coil, will raise the resonant frequency of the L1 coil, at which the impulse will be.

Very happy I chose 2 nylon rings instead of just one (would have increased capacitance)

did quick test: -1100V impulse 450nS at 61kHz good enough for now