The bifilar pancake coil at its resonant frequency

[evostars]

Nice work, I like the calm style of the videos and the explanations were done well. Keep up the great work. I haven't done much research in this field, but a static magnetic field in the coil when driven by ac seems strange. My first thoughts are that the coil driver is not providing a perfectly balanced sine wave. The residual DC from the inbance causes the static magnetic field. Is this a possibility?

Thank you!
I'm not using sine waves. They dont work. I use very short energetic pulses. The IGBT driver is doing that. But a square wave from a pulse generator also works.
I think the static magnetic field is a result of the standing wave created at resonance.

when water is standing still, the wind blows, and shows traveling waves.
But when the water is flowing fast, and hits a rock, it flows around it, and produces a standing wave.

[evostars]

Indeed very chill out videos. Keep it up Evostars and thanks for sharing your thoughts.

I do believe the same. One direction pulse driving, leads to a static magnetic field illusion. Actually is a pulsed, one way direction magnetic field.

Regards

Thank you.

Keep in mind, I have 3 coils on top off eachother.  the middle coil is freely resonanting with the field produced by the top and bottom ones.
The top and bottom coil are pulsed (not sine wave but short sharp pulses, in the video you see a square wave, of the pulse generator, but the igbt gives a energetic pulse)

The top and bottom coils are in series, and the pulse therefore gives a opposite field above and below the coils. the coils are therefor in attraction.

lets say a pulsed coil, produces a north above and a south beneath it.  then the north and south are joined when you stack them. in this place of attraction the center coil is placed, in the north south field.

But as I have shown in the video (magnetism) there is almost NO attraction of the magnetic fields!

I think we really need to look at the dielectric field, the capacitance. and the properties of this field. As it seems to be the origin of the magnetic fields.

[evostars]

I've made an update to "The dielectric field of a bifilar pancake coil" video.
In this earlier video I showed the effect of grounding on a LED array.
In this addition I show the effect of grounding on two capacitors.
https://youtu.be/4_q8TjEMM50

[dieter]

Very interesting project. You may want to look at "Jack Noskills" project, in which he uses a high capacitance coil too, but what is diffrent is: he does not connect the two windings, but uses them with open ends, so the coil may load, but no current may flow. He achieves some interesting results, some similar to yours, such as bypassing high resistors, and difficulty to convert the output to a form that (not only eg. lightbulbs, but also) inductive Loads can use.


I got to find the link...


BTW. would be nice to have some essential data here:
Pulse frequency, duty time, voltage, coil specs, any diodes to guide the collapsing fields back emf...


kr

[dieter]

Ok here's Jack Noskills' thread/ project:


http://overunity.com/17119/pulling-energy-from-the-ambient-energy-field-using-a-coil-capacitor/msg501319/#msg501319


I don't mean to become offtopic, there seem to be some interesting parallels.