Meyer type WFC - from design and fabrication to test and development.

[Farrah Day]

Tesla bifilar winding for high energy storage.

Note: Tesla depicted this bifilar coil in a pancake construction.

[raburgeson]

with tap water in, what if you just pulse the curcuit and read the tank frequency with an oscilloscope? If the cathode and anode match Steven's in size then the resonant return should reveal the frequency. Of course the tank signal will decay rapidly and it will take some messing around to get a trace.

[Farrah Day]

Hi Rab

Yes a few things need to be monitored in order to see what is happening. Another thing I found today was that my old analogue scope is just not up to it, so I'm now waiting on a better storage scope.

The bifilar windings are very interesting. Until now, I had not properly looked into the bifilar because other things seemed more of a priority, however, the more research, the more interesting it gets.  I've just constructed a small bifilar coil and a small trifilar coil to experiment with.

As Tesla says, because the energy stored in the inductor is a square of the potential difference between each winding, it is possible to increase the energy stored many thousands of time by bifilar winding.  Tesla estimated that his 1000 turn pancake bifilar with 100 volts across it would store 250,000 times more energy than a standard 1000 turn inductor, as he would have a 50 volt pd between adjacent windings as opposed to just one tenth of a volt!

Standard inductor (0.1v x 0.1v x 1000 turns = 10)
Bifilar wound inductor (50v x 50v x 1000 turns = 2,500,000)

[HeairBear]

It doesn't have to be a pancake coil as stated in the patent. I think a lot of people see the diagram and think thats the way it must be done. The illustrations shown in the patent are for a better understanding of how the coils are connected and not to be confused with how the coil is wound.


HairBear

[Farrah Day]

Agreed HB

It doesn't have to be of pancake construction, the ones I've constructed to date aren't. However, I would assume that there is a distinct difference in properties between the pancake coil and the standard coil in which all the turns are of the same diameter.

I'm not sure just how this electrically effects the properties at present as I've yet to construct and test one (and can find no info available on this), but in general as the capacitance between each winding of a pancake coil increases with every turn unlike the standard coil where it remains constant, I would expect some differing properties.

Incidentally I've modifyied my attached document a few posts above as I realised I'd made a mistake in the depiction.