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  #1  
Old 03-18-2017, 01:41 AM
evostars evostars is offline
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Smile Magnetic field of a bifilar pancake coil

Tesla made a patent about the bifilar coil (512340) where in he states some interesting things about the added capacitance of the coil windings, and the abillity to counteract self inductance due to it.

I have build several bifilar coils, and since I could not find a lot of good info, I have decided to share some of my findings, in a video series.

In this first video, I talk about the magnetic field, with DC current, and when it is pulsed at its resonant frequency.
https://youtu.be/uhY27Zoor-Q

In other videos I want to talk about the dielectric field, the voltage rise, at its resonant frequency, and the special nature of this (radiant) energy.
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Old 03-18-2017, 04:49 PM
evostars evostars is offline
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the dielectric field of a bifilar pancake coil

I made a video about the dielectric field of the bifilar coil, when it is in its resonant frequency. At resonance the dielectric field is freed of its magnetic component, and radiates around the coil. If you are sensetive to energy fields, you can clearly feel this. But it is also measurable, with a osciloscope. the probe will pickup the field in the air surounding the coil.

https://youtu.be/xHDrmGPY-78

It shows the radiant sparks, the charging of a condensor, and the glowing of 9 LED's all connected with just one wire.
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Old 03-19-2017, 12:44 PM
evostars evostars is offline
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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
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Old 03-21-2017, 01:21 AM
telemachus telemachus is offline
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Thanks for sharing the videos. I watched your 2nd video (the 16 minute one) - the explanation about how the bifilar coil differs from a capacitor was very interesting and useful.
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Old 03-22-2017, 03:26 AM
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Sputins Sputins is offline
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Quote:
Originally Posted by evostars View Post
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
I’m yet to watch the more recent video above.

What method of determining or measuring the self-capacity of the bifilar coil have you devised? (Most LCR meters won’t measure capacity on a given coil directly). Given that you can measure L with a meter and determine the self-resonant frequency, one could back calculate the self-capacity.

One could take two given lengths wire of exact same length. With wire length 1, wind in standard single wire flat spiral format. The other length wire 2, divide it in two and wind it bifilar style and connect in series. Then one could chart the various characteristics of each, given they have the same total length of wire. (Compare resonant frequency, Q-factor, voltage rise, self-capacity, inductance etc., etc.

I’m certain such characteristic comparison has already been done somewhere by many people, but doing it yourself teaches it to you directly, & maybe you’ll detect other differences.

It is funny that while Tesla invented the Bifilar coil, it seems that he hasn’t really specified on where, how or for what application it is really intended for except to say as per the patent, “Coil for Electromagnets”. So that leaves it open for broad speculation.
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Old 03-23-2017, 11:17 PM
evostars evostars is offline
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Originally Posted by Sputins View Post
I’m yet to watch the more recent video above.

What method of determining or measuring the self-capacity of the bifilar coil have you devised? (Most LCR meters won’t measure capacity on a given coil directly). Given that you can measure L with a meter and determine the self-resonant frequency, one could back calculate the self-capacity.

One could take two given lengths wire of exact same length. With wire length 1, wind in standard single wire flat spiral format. The other length wire 2, divide it in two and wind it bifilar style and connect in series. Then one could chart the various characteristics of each, given they have the same total length of wire. (Compare resonant frequency, Q-factor, voltage rise, self-capacity, inductance etc., etc.

I’m certain such characteristic comparison has already been done somewhere by many people, but doing it yourself teaches it to you directly, & maybe you’ll detect other differences.

It is funny that while Tesla invented the Bifilar coil, it seems that he hasn’t really specified on where, how or for what application it is really intended for except to say as per the patent, “Coil for Electromagnets”. So that leaves it open for broad speculation.
Indeed, Tesla did give a small clue. In his patent (512340) he states it is able to counter act self induction. To me that says it counteracts Lenz Law (I think its not a law, but a observation):

Tesla quote from 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.

The capacitance of the bifilar coil you ask. I just did a measurement with a LCR meter. It is not a correct reading, but valuable for tuning. I simple disconected the two windings (series) and measured the capacitance between the two disconected windings of the bifilar coil.
It was around 1,7nF with a inductance of 0,47mH.

When you calculate thes numbers, the resonant frequency is way off, I remember something like 178 kHz. While in real time it was more in the 600kHz range (dependend on the setup).

So this way of measurement is good for tuning (if you need 2 equal coils).

So to answer "What method of determining or measuring the self-capacity of the bifilar coil have you devised?":
NONE
But indeed, as you stated you could use a calculater when you know the resonant frequency, but... its more complicated, because the capacitance is influenced when you resonante the coil, via another coil...
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Last edited by evostars; 03-24-2017 at 05:43 PM.
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