The bifilar pancake coil at its resonant frequency

[evostars]

If you put a sheet of aluminum foil on top of your pancake if are properly tuned it will levitate the foil because diamagnetic properties of aluminum .

I tried this but with no results. I tried serveral ways, above, below, single pulsed coil, free resonant coil, little picece of foil, big piece of foil, circular piece of foil with a hole in the center.... 

Maybe this is because the pancake coil has the north ans south magnetic poles in the same space? There is no pole separation as in a solenoid.

What I did observe, and was expecting, was a change in capacitance, and therefor a change in the resonant frequency.

Nelson Rochaa, could you tell a little bit more about this floating aluminium foil setup? Could it be I need more voltage? The pulse driver is 12V but the resonant coil is hundreds of volts. Maybe, I need to get into the thousends of volts of dielectric resonant (radiant) energy?

Any comments are welcome!

(ps the resonant video is not yet done, it was a bit harder to put it in a relative short video).

[nelsonrochaa]

I tried this but with no results. I tried serveral ways, above, below, single pulsed coil, free resonant coil, little picece of foil, big piece of foil, circular piece of foil with a hole in the center.... 

Maybe this is because the pancake coil has the north ans south magnetic poles in the same space? There is no pole separation as in a solenoid.

What I did observe, and was expecting, was a change in capacitance, and therefor a change in the resonant frequency.

Nelson Rochaa, could you tell a little bit more about this floating aluminium foil setup? Could it be I need more voltage? The pulse driver is 12V but the resonant coil is hundreds of volts. Maybe, I need to get into the thousends of volts of dielectric resonant (radiant) energy?

Any comments are welcome!

(ps the resonant video is not yet done, it was a bit harder to put it in a relative short video).

Hi Evostars ,
I tested with aluminum foil full covering the coil .
You could see by the video link that i send to you that i'm not able to measure any magnetic field orientation even when i connect a load in the receiver coil look please with attention that point  .
I will suggest to you,  that you test again but with a higher output , i use in that particular test a input of 24v  otherwise i will try make a video demo in future because i don't know some details like the frequency you are using to pulse the coil or the way you pulse the coil .

Good luck

Nelson Rocha

[evostars]

Thanks Nelson Rocha,
My setup is using a IGBT pulse driver (PWM-OCXi v2.1 from  rmcybernetics.com, it makes life easy), It dumps the load of a 2200uF capacitor charged by a 12V 1A adaptor into the coil (low impedance maybe less then 2 ohm), creating short sharp pulses.

The coil can be:
- a single bifilar pancake coil pulsed, with a resonant bifilar coil on top (and one below as i prefer)
or two coils in series connected and pulsed, with the third resonant coil in between.

I usualy connect the outside wire to ground, on the south side.

I saw your video with the compass, indeed the compass isnt moving, but I could only see one needle, and it was pointing to the center. So, maybe If you make another video, hold the coil on its side, so the needle doesnt become stuck as it will be dragged down.

It would be a nice video to see the aluminium floating!

[evostars]

about that IGBT pusle driver, It is capable of making square waves, but due to the low impedance and the simple wall power adapter,  it generates these short pulses, due to the shortcut.  And thats exactly what this coil likes. much better than square waves.

I just made pictures of the pulse driver, these show the igbt, and the igbtdriver

[nelsonrochaa]

Thanks Nelson Rocha,
My setup is using a IGBT pulse driver (PWM-OCXi v2.1 from  rmcybernetics.com, it makes life easy), It dumps the load of a 2200uF capacitor charged by a 12V 1A adaptor into the coil (low impedance maybe less then 2 ohm), creating short sharp pulses.

The coil can be:
- a single bifilar pancake coil pulsed, with a resonant bifilar coil on top (and one below as i prefer)
or two coils in series connected and pulsed, with the third resonant coil in between.

I usualy connect the outside wire to ground, on the south side.

I saw your video with the compass, indeed the compass isnt moving, but I could only see one needle, and it was pointing to the center. So, maybe If you make another video, hold the coil on its side, so the needle doesnt become stuck as it will be dragged down.

It would be a nice video to see the aluminium floating!

Hi Evostar,
The two compass are static even before i start feed the circuit because the needles are in their normal position .
You could see too, after i approach the magnet they change their position under the strong magnetic field of magnet but  they return to their normal position even far way outside of coil .  At minute 1:18 i put one of compass under the wire that feed the load (bulb) and their position should change  but needle not change in their position .

I will try next week making new video to show that and aluminum foil levitate .

cheers