Muller Dynamo

[poynt99]

@Poynt99 . The current was the same in each case -0.8 amps . Remember that the total number of turns was the same in each case , and thus the total wire length was approximately the same . So , in the bifilar case , you have 2 wires in series , and in the quad case , 4 wires in series . It would seem to me that the total number of amp-turns is the same in each case .

OK, interesting neptune. Thanks.

.99

[bolt]

Regarding bifilar coil magnetic field strenght I did similar experiments, which confirm a greater magnetic force vs normal winding.
http://www.youtube.com/watch?v=3AxxxVLmORM&hd=1
In my video the two coils are in series, so the power going through (current) is the same in both cases.

After few experiments with my pulse motor setup I figured that we have to reduce input power to get any close to OU.
That is why I just ordered a small 3-phase motor 0,5kW 3000 RPM to play with a resonant rotoverter circuit setup.
I will mount a wheel with magnets on its axis when tuned an will go from there to match the output load vs input tunning...

Good idea and you have a perfect stable bearing shaft to mount the rotor for testing. Remember to take off the motor fan and thoroughly clean the grease from the bearings and use 1 drop of sewing machine oil or better PTFE or Silicone based oil. This will run very nice at 3000 rpm and use about 10 watts at 120v.  If you use an variable pulse width frequency adjustable inverter it will spin the rotor full speed using about 2 watts.

[Magluvin]

I did a small experiment today involving bifilar windings . Someone else posted a link to a website about this . I made 3 electromagnets using 3 similar iron cores . Each magnet used the same length of wire . One was wound normally , one bifilar and one quadrifilar .The same power supply was used to test each electromagnet in turn . The strength of each was tested by seeing how many small nails it would lift . The results were as follows .
Normall wind- 4nails .
Bifilar wound - 12 nails .
Quadrifilar ,12 nails .
    Note that each electromagnet had the same core and the same Amp-turns .I was surprised that quadrifilar was no better than bifilar . This experiment seems ridiculous , but you MUST do it yourself . The implication is that by using a bifilar motor coil , you could create the same input torque for a much lower electrical input , maybe as low as one third . Got to be worth a try? But do the simple experiment first .

Hey neptune

There is a reason for the difference between 2 and 4 filar coils.   Imagine 2, each winding is in proximity to the other providing a 50% voltage difference between the 2 all the way through the windings.  Say 10v in, the current flows through 1 of the windings to the opposite end of the total winding, then connects to the beginning of the other. Its like a voltage divider.  If you have 10v in, then measure only across 1 of the windings you will see 5v.

So anywhere within the coil, if you scrape the enamel from the 2 wires, you will measure 5v. If wound nice and neat. ;]

With 4, there is only 3.333v between adjacent turns.

This kinda tells me that the best would be just 2. I dont comprehend any advantage to more, yet.  ;]

Now, with a 1 strand winding, lets say 100 turns, with 10v input, if you measured adjacent turns, the voltage will be 10v/100 turns. This would be .1v between the adjacent turns. This is what is stored in the self capacitance of a single wire coil.  Not much ay?

Im not sure of the advantage of going more than 2. Bruce seems to believe so.  Testing will have to be done there.

Tesla explains it for 2 in his pat. for this electromagnet.

More may work also, as it is like having the caps in series. Between wire 1 and 2 is 3.3v, between wire 2 and 3 is 3.3v and between wire 3 and 4 would be 3.3v   ;]

Hope that makes sense.  ;]

Mags

[rukiddingme]

Interesting rectangular and compacted litz wire:

http://www.newenglandwire.com/litz.asp

[yssuraxu_697]

Regarding bifilar coil magnetic field strenght I did similar experiments, which confirm a greater magnetic force vs normal winding.

Tesla bifilar has less inductance than normal winding.
If you apply current it builds up faster in Tesla bifilar - so the shock to material is greater and it magnetizes more.
I guess it will not work with all materials.
But with all materials TB has less inductance because it has more capacitance. So it is very good
idea to use it as DRIVE coil. Not so sure about gen coil... (less inductance - less voltage?)
I'm talking about just simple gen coil - no magic tricks that noone really knows