The Solenoid/Electromagnet

[Hrothgar]

devils in the details

Lot of questions ....Well, maybe both statement are true ? Insulation of ordinary enamelled wire is tiny and thus voltage required to use distributed capacitance is low, I think.
Does this distributed capacitance always correctly interacts with the inductance of this coil ? Why and how ? Does the magnetic field produced is bigger when DC current is applied of some pulsating DC of certain frequency ?

If that happen surely it will give more power to the created magnetic field, which is in other cases consumed into resistance heating. In such case pancake bifilar coil wound be essentially close to room temperature superconductor or self-adjusted tank circuit at resonance.

Can we isolate the reason why magnetic field from such coil is stronger ????

I can think of 3 types of heat gain:
1. material resistance, unavoidable having to use some non conductors in any design.
2. workload, whether from the resistance of the work load or materials in the workload otherwise the gears(flux) are free-wheeling and useless to us(with current technology).
3. poor design, having individual coils aligned to induce reluctance for no purpose, or the orientation of the coils to cancel work done even though they do not interfere with each other directly.

I believe a finely tuned/designed a coil can have a tighter stronger flux if aligned properly like a north/south halbach. Or a looser general field. These modifications would require very precise latices with magnetically resistive and conductive layering.

[chainmailleman]

Lot of questions ....Well, maybe both statement are true ? Insulation of ordinary enamelled wire is tiny and thus voltage required to use distributed capacitance is low, I think.
Does this distributed capacitance always correctly interacts with the inductance of this coil ? Why and how ? Does the magnetic field produced is bigger when DC current is applied of some pulsating DC of certain frequency ?

If that happen surely it will give more power to the created magnetic field, which is in other cases consumed into resistance heating. In such case pancake bifilar coil wound be essentially close to room temperature superconductor or self-adjusted tank circuit at resonance.

Can we isolate the reason why magnetic field from such coil is stronger ????

Honestly, I don't know why the field is stronger. I notice that when the power is applied there is a huge surge of field strength that dampens out. A single wire wound coil also possesses this interesting phenomena, however the bifilar coil in either configuration (series or parallel) causes a much more pronounced effect. The currents circulating inside the coil by it's own induction could have something to do with it based on the formula (Amp = change in electrification / time). But as to why the coil produces a stronger field per watt, I don't know. All I know is it does based on the experiments of 2 others and myself.

What this means is that less power is needed to saturate a core with the lines of force.

[john_g]

Honestly, I don't know why the field is stronger. I notice that when the power is applied there is a huge surge of field strength that dampens out. A single wire wound coil also possesses this interesting phenomena, however the bifilar coil in either configuration (series or parallel) causes a much more pronounced effect. The currents circulating inside the coil by it's own induction could have something to do with it based on the formula (Amp = change in electrification / time). But as to why the coil produces a stronger field per watt, I don't know. All I know is it does based on the experiments of 2 others and myself.

What this means is that less power is needed to saturate a core with the lines of force.

Hi Chainmailleman

Have you tried winding any coils using copper tape rather than wire? Just interested in results if any.

Regards

John

[chainmailleman]

Hi Chainmailleman

Have you tried winding any coils using copper tape rather than wire? Just interested in results if any.

Regards

John

I have not. Although this sounds like a very cost effective way of making induction coils.

[Hrothgar]

Mil to Awg

Can someone work out the equivalent awg of the 3mil 3m brand copper tape for the 1/4, 3/8, 1/2 and 1 inch tapes I'm sure it will come in handy for the rest of us. Also, since it will have to be insulated, does anyone know of a good coating to use?

[wrtner]

Can someone work out the equivalent awg of the 3mil 3m brand copper tape for the 1/4, 3/8, 1/2 and 1 inch tapes I'm sure it will come in handy for the rest of us. Also, since it will have to be insulated, does anyone know of a good coating to use?

Patrick's Appendix 1 has a table of AWG/SWG values, including
the cross sectional areas. We could take the cross sectional
area of hte 3M tapes and assume it will be the same as for
the circular cross sectional area material. If you ar econcerned
with current carrying capacity, the linkage may not be perfect
since it is thought that most of the current is carried at the
edge.

Equating the perimeters might be better.

[wrtner]

The pancake coil itself may have been illustrated mainly for communication, the visual of the wire turning back on itself is probably easier to understand this way.

No, I think this is quite wrong.

Tesla designed the flat spiral coil because he needed a flat spiral coil.

[Hrothgar]

I was speculating

the structure of my sentence implied that, I said main reason not only reason for the pancake and not one of the other coil types as the illustration.

[Hrothgar]

Found a coating for the copper tape

I found some "liquid electrical tape" in a spray can at Harbor Freight it seems like it will do the job covering the copper tape.

[Berg]

Solenoid Experiments

There's a fellow by the name of Robert Murray-Smith on YouTube who has posted some videos on solenoid experiments using electromagnets coils, neodymium magnets and a ferrite rod. He gets good results with low power.

(Be forewarned the audio is kind of choppy.)

Free Energy Power Amplifier - 1 - YouTube

Free energy power amplifier - 2 - YouTube

Free Energy Power Amplifier 3 - YouTube

Free Energy power amplifier - 4 - a new implementation - YouTube

And another couple of videos by YouTuber gotoluc.

Mostly Permenent Magnet Motor - Test 1

Mostly Permenent Magnet Motor - Test 2

The other inventor is Bob Teal. He called his invention Magnipulsion.

Bob Teal | Magnipulsion| Missing Interview - YouTube

Teal's system uses attraction only with no magnets. His system also captures the kick-back from off of the coils and uses it to power an incandescent bulb.

[thebanano]

greeting all...
takihg about tesla bifilar patent, perhaps this site would give us an slightly information about what happen on the bifilar and non bifilar solejoid winding...

www.Magnetricity.com ... Tesla's BIFILAR 'COIL FOR ELECTRO-MAGNETS' Patent # 512,340, dated January 9, 1894

right now i am trying 2 light up an low watt cfl using one battery using flyback core with bifilar winding on the secondary... trying to use both in paralell or series connection of my bifilar secondary...

[Magluvin]

The pancake coil itself may have been illustrated mainly for communication, the visual of the wire turning back on itself is probably easier to understand this way.

Yes, I believe the pancake coil was shown for illustrative purposes. It makes it simple to understand the differences of a single wire and a bifilar coil.

If we think about it, the title of the patent claims 'electromagnet' and also it talks about coils of 1000 turns. Ever wind a 1000 turn bifi pancake?

Not to make the pancake look bad. It has its purposes, one way or the other.

Mags

[Farmhand]

People who see a 4 times increase in self inductance are using twice as much wire.

All coils that are supplied current and produce a magnetic field are "electromagnets" by definition.

Magluvin is correct the spiral coil on the patent is for illustrative purposes.

The point of the patent is to wind a coil so that when the coil is excited by
currents of the correct frequency the current flows through the coil as if the coil
has no self induction, so the current only faces the DC resistance of the wire.

Every coil that uses electricity to produce a magnetic field is an electro-magnet.

Every coil in every motor is an electromagnet because it's purpose is to
create a magnetic field when it is supplied electric current.

The self capacitance is related to the voltage applied in Tesla's coil for
Electro-Magnets due to the reasons I outlined about the capacitor plate
separation. Some people who claim to be quite smart tried to deny that.
But it is true and it fits conventional knowledge and is logical.

So to properly tune a Coil for electro-magnets, the voltage to be used is also
a consideration. A coil wound for effect at 100 Khz using 10 000 volts will not
work the same if 10 volts is used due to the capacitor plate separation
(thickness of insulation or distance between turns) causing the secured self
capacitance to be less.

This is evidenced by the way Radio coils are spaced to reduce self capacitance.

People can dispute whatever they like but time will tell all truths.

The patent claims are truthful and the patent is valid. The patent itself states
that the patent covers all coils be it solenoid or any other coil made to be a coil.

Don't listen to the extremists. They avoid the valid points and dwell on, "it has
no uses so the patent is pointless", or, "this coil makes free energy".

Which does nothing to advance the understanding or the use of the coil.

I didn't need any guru to explain it, or confuse it for me. I read the patent
and applied logic and common sense to see it's meaning and significance.


Cheers

P.S. The effect of the "cancelling of the effects of the self inductance" is a
reactance thing, but it is not limited to AC excitement, the coil can be excited
with DC pulses at the correct frequency or alternating positive and negative
DC pulses (less than 50% duty or less than a Square wave AC). What the
patent does not relate to is Uninterrupted DC, uninterrupted DC after some
initial time only faces the DC resistance of the coil anyway, so no need for a
special coil, unless Pulsed DC is used or AC or alternating DC pulses.

If a coil is pulsed with DC pulses at a random frequency the coil will exhibit
reactance and the reactance can be cancelled if the excitement of the coil is
done at the correct frequency for the effect to manifest.

It's Tesla, 101. Using resonance effects.

..

[wrtner]

Yes, I believe the pancake coil was shown for illustrative purposes. It makes it simple to understand the differences of a single wire and a bifilar coil.

This is nonsense. Look at the work of the massive Tesla coil builders
and even the front cover of "Wheelwork of nature":
Valone harnessing the wheelwork of nature - tesla's science of en...

It is easy enough to sketch a bilar traditional coil. If he had
meant that, he would have done that.

[Hrothgar]

Dumbing it down for the patent office

This is nonsense. Look at the work of the massive Tesla coil builders
and even the front cover of "Wheelwork of nature":
Valone harnessing the wheelwork of nature - tesla's science of en...

It is easy enough to sketch a bilar traditional coil. If he had
meant that, he would have done that.

Why would it have been nonsense to have part of the reason he chose to illustrate the pancake coil that it would seem more understandable to the morons(regular people) that surrounded him? Please remember that this was pure speculation and not meant to disrupt anyone's emotional equilibrium.