Tesla's "COIL FOR ELECTRO-MAGNETS".

[Magluvin]

It looks like pretty thick wire. I would try a 12 volt car battery. These coils start to exhibit special qualities when activated with hi-voltage pulse. I want him to try to pulse the coil over the steel plate and see if the plate acts like a magnet.

From what I understand of a pancake as a magnet, it should magnetize the plate radially, if the pulse or input is strong enough. Meaning the center of the plate would be 1 pole, and the outer diameter would be the opposite pole. That would make the plate an unusual magnet. All one pole on the outer edge of the disk.

Mags

[Magluvin]

Just got the coil wound. I use a bit of glue to hold the outer windings down so it doesnt accidentally unravel. Mistakes with this wire are painful. But 55000 ft for 35 bucks, and I can do a lot of experiments at less expense. Imagine the same coil made of say 16awg 3000 total truns. It would be huge and not cheap. For experimentation purposes anyway.

Glue is drying and terminals ready to terminate. Then we measure. Any body want to try and guess what capacitance it may have before I measure it?


Mags

[Farmhand]

I did the "pan cake coil on a steel plate and aluminium plate" test.

Both the bifilar and the monofilar pan cake coil show the same increase of inductance when put on a mild steel plate (34 µH increases to 50 µH).

Both coils do not show an increase of inductance when put on a aluminium plate.

As I recall, someone expected some magic when doing this test? Unfortunately there is no magic. But of course, I for sure did something wrong.

Greetings, Conrad

Results are as expected I think, not sure who or what comment you refer to. Anyway I was thinking of using a steel plate as a load so that when tuned the coil is tuned to a load as with and induction cooker or induction heater there is some energy removed and the Electro-Magnet is doing some work to heat the load. The wanted output product is heat in the steel plate in that experiment.

My thinking is that with bifilar serial connected coils if we tune the bifilar coil to a certain frequency then the capacitor required to tune the monofilar to the same frequency (for maximum heating output on the load) is external. Then the bifilar coil should see less current as the field declines due to the unused energy being stored in the capacitance of the bifilar coil where as in the monofilar coil some of the unused energy is stored in the external capacitor.

Both should do the same work on the load but the bifilar one should see less or no "Tank current". There is loss in that "extra" current, if the capacitance is all distributed the loss would be less. I think that is what Tesla describes in his patent as well. In a way.

P.S.

Basically when comparing a given distributed capacitance as the "C" of a "Tank" to that of an external capacitance equal to the distributed case, as the "C" of an identical frequency Tank, then the distributed capacitance should be "Inherently" more efficient due to less current in the coil or "through the coil in the case of the external capacitor one.

.. 

[conradelektro]

From what I understand of a pancake as a magnet, it should magnetize the plate radially, if the pulse or input is strong enough. Meaning the center of the plate would be 1 pole, and the outer diameter would be the opposite pole. That would make the plate an unusual magnet. All one pole on the outer edge of the disk.

Mags

I found the attached images depicting the magnetic field of a pancake coil and of one loop of wire.

The pan cake coil is the primary of a Tesla coil and has a hole in the middle (on the image the pan cake coil is depicted as 3 dots left and right of the cut through the upright Tesla secondary).

The field of a pan cake coil is in principle like the field of a helical coil. No way that there is a pole on the rim. The poles are axial like in any coil.

Any wire loop creates in principle the same magnetic field if current flows through the wire.

Old but still nice explanations: http://onlinephys.com/magnetism.html

My opinion: there is so much unfounded hype about pan cake coils and bifilar coils, real measurements are very rare.


Prediction for inductance and self capacitance of Mag's new little bifilar coil (but please do the measurements, it is just a guess):

wires in series: 100 to 200 mH , self capacitance 1 to 5 nF

only one wire: 25 - 50 mH, self capacitance 100 to 500 pF

Greetings, Conrad

[synchro1]

Results are as expected I think, not sure who or what comment you refer to. Anyway I was thinking of using a steel plate as a load so that when tuned the coil is tuned to a load as with and induction cooker or induction heater there is some energy removed and the Electro-Magnet is doing some work to heat the load. The wanted output product is heat in the steel plate in that experiment.

My thinking is that with bifilar serial connected coils if we tune the bifilar coil to a certain frequency then the capacitor required to tune the monofilar to the same frequency (for maximum heating output on the load) is external. Then the bifilar coil should see less current as the field declines due to the unused energy being stored in the capacitance of the bifilar coil where as in the monofilar coil some of the unused energy is stored in the external capacitor.

Both should do the same work on the load but the bifilar one should see less or no "Tank current". There is loss in that "extra" current, if the capacitance is all distributed the loss would be less. I think that is what Tesla describes in his patent as well. In a way.

P.S.

Basically when comparing a given distributed capacitance as the "C" of a "Tank" to that of an external capacitance equal to the distributed case, as the "C" of an identical frequency Tank, then the distributed capacitance should be "Inherently" more efficient due to less current in the coil or "through the coil in the case of the external capacitor one.

..

Farmhand is underscoring an important difference here  in the sensor characteristics of the serial biflilar. "the bifilar coil should see less current as the field declines". The serial bifilar needs it's capacitance charged to begin with, just like the external capacitor on the monifilar! Energy stored in the capacitance of the bifilar coil has to intitiate from somewhere.