The bifilar pancake coil at its resonant frequency

[sm0ky2]

"absence of lenz law effect"




I almost lost a kidney

[evostars]

Hi Evostars,
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 rewatched it a few more times. It really has no magnetic field. It is differnt from what i am used to.  I wonder how you energise you coils. It looks you use a pulse generator, with a half bridge mosfet pulse driver, correct? one mosfet for the up ramp, and one for the down ramp of the pulse signal?

I also looked at your bifilar pancake coils. It looks like the 2 windings are on top of eachother (instead of next to eachother), like a roll of speaker wire. Is that correct? Two pancakes on top of eachother, connected in series?

That could explain alot, as the capacitance it then 90 degrees rotated (in between the 2 coils on top of eachother, connected in series)
I Think im going to try that myself   It seems that the magnetic field and the dielectric are not phase related (vectors) anymore, but also at a 90 degree angle.

[evostars]

"absence of lenz law effect"

I almost lost a kidney

Good you have 2 of them!

[MileHigh]

Yes the field is stronger. Also, with a DC measurement, the resistance is differnent compared to a normal coil. This video shows it clearly:
https://www.youtube.com/watch?v=uNAZ6heorEc

Ooh is that TheOldScientist clip ever cringeworthy.  He shows a difference in DC resistance between a regular coil and a bifilar coil where both coils are supposed to have the same total wire length and DC resistance.  He acknowledges this apparent anomaly that does not make sense but then simply moves on and accepts the measurement.  One possible explanation is that he has an accidental short in one of the two half-coils that make up the bifilar coil.  There is no way you should look at a measurement that you know is wrong and accept it.

But the super cringeworthyness comes up when you see his jagged scope traces and the complete ragged mess of a scope trace at the end of his clip.  He makes no comment about that issue.  He may have been feeding a square wave into his coils under test which would be a mortal sin and a great display of ignorance.  However, I can't be sure about that, I don't know the true reason for the jagged scope traces.  However, what I do know is that he should have been observing near-perfect sine waves on his scope trace.  The fact that he is not seeing sine waves is telling you that something is seriously wrong.  Either way it is a lose for TheOldScientist.

Sorry, but I personally have very low confidence in TheOldScientist.  He is free energy clickbait.

Finally, the strength of the magnetic field generated by a coil is derived from the ampere-turns.  A regular coll and a bifilar coil where both coils have the same number of turns will generate a magnetic field of the same strength.  This is hard knowledge that is carved in stone and can easily be verified with proper measurements.  The user Conradelectro did the experiment himself and posted his clips.  So that is one myth about the bifilar coil that is not true.

MileHigh

[MileHigh]

Tesla explains it in his patent (512340):
In electric apparatus or systems in which alternating currents are employed the self-induction of the coils or conductors may, and, in fact, in many cases does operate disadvantageously by giving rise to false currents which often reduce what is known as the commercial efficiency of the apparatus composing the system or operate detrimentally in other respects. The effects of self-induction, above referred to, are known to be neutralized by proportioning to a proper degree the capacity of the circuit with relation to the self-induction and frequency of the currents. This has been accomplished heretofore by the use of condensers constructed and applied as separate instruments.

My present invention has for its object to avoid the employment of condensers which are expensive, cumbersome and difficult to maintain in perfect condition, and to so construct the coils themselves as to accomplish the same ultimate object.
end of tesla quote

To me this says the bifilar coil, is dodging lenz law (which isnt a law, but a observation)

For the Tesla bifilar coil patent you have to take early twentieth century English and translate it into modern technical English.   The "false currents" are excessive current flowing in the wires because of low power factor for a device or machine that has mains-fed electrical coils.  He is saying that his bifilar coil incorporates the power factor correction capacitance within the coil itself.  This is to reduce costs because apparently in the early twentieth century capacitors were expensive and not in commercial production.

Just search on "using capacitors to correct power factor."

Here is a good link from that search that gives you the full number crunching:

https://www.allaboutcircuits.com/textbook/alternating-current/chpt-11/practical-power-factor-correction/

I seriously doubt that bifilar pancake coils were ever used in some kind of AC mains powered device or machine to correct for the power factor for the device or machine.  I view this as a purely academic exercise where Tesla filed the patent in case somehow bifilar coils made it into a useful electrical machine.

All of this has nothing to do with "dodging Lenz's Law."

MileHigh