The bifilar pancake coil at its resonant frequency

[Magluvin]

I would say those coils would be lucky to be .10 ohm's.
Looks like plastic coated building wire to me.


Brad

Yeah, I have gone through many many miles of wire of all sizes for 42awg to 0ga.  His analysis just never seems to jive with what is shown as an example. I dont want to start shit here but it had to be said, for the record.

Mags

[tinman]

1 watt hour of power generates 1 Tesla of magnetic force in a coil of 1 Henry of inductance. How come no one could answer this question?

None of these "F" in inductance people can define "Negative Current" either!

Your question was-->What amount of power would be required to generate 1 Tesla of magnetic flux density in an "Inductor Coil" with a measured inductance of 1 Henry?

Your answer was-->1 watt hour of power generates 1 Tesla of magnetic force

You dont even know how to answer your own questions.

Positive power goes in one electrode of the coil and out the other. When the power's interrupted, negative current leaves the coil in the same direction as the positive current did.

So now this negative and positive current of yours,flows in the same direction 


Brad

[Magluvin]

Here is Conrad's video on his bifilar coil tests, Part 2  this is what MileHigh has referred to:
https://www.youtube.com/watch?v=spQ9yLdb7v4 

The coil parameters are clearly listed in the description text under the video, I quote:

"The following parameters are identical for both coils:

diameter of coil:     90 mm
number of wire turns:   30 monofilar, 15 bifilar
DC resistance:     0.4 Ohm
Inductance:     34 µH , measured with a LCR meter
phase angle in Z:     3 degrees, measured with a LCR meter"

So 0.4 Ohm DC resistance is involved.

Using MileHigh example of the 3.39 A RMS current in this coil, power loss would be 3.39^2 x 0.4 = 4.59 W instead of 114 W for a 10 Ohm coil. 
Once we use most parameters of a practical coil, why not use its exact DC resistance too?

Gyula

Thanks. I didnt get into the sec vid.  And exactly on that last one.

I was on chat with someone that while we were talking, he inspired me to think beyond what is known commonly with the bifilar coils. He would not give me any answers, but made me think as we went along. So i came up with, is there a difference between the induction of 2 coils of a transformer if when the windings are separate, like side by side, or 1st layer and second layer, as compared to a bifilar winding used as a pri and sec for each conductor in the winding, and he said, "now your thinking"

So that is my next experiment. Never though to try that. Hopefully others will give it a go.  This was some weeks ago. I have recently thought, well what if we want a step up or step down? What happens with the extra turns of the step up secondary if it doesnt have any more primary to roll with?  Anyway, Ill go for the 1 to 1 and do some things to see if there is anything to it.


Mags

[tinman]

1 watt hour of power generates 1 Tesla of magnetic force in a coil of 1 Henry of inductance. How come no one could answer this question?

None of these "F" in inductance people can define "Negative Current" either!

Positive power goes in one electrode of the coil and out the other. When the power's interrupted, [b]negative current [/b]leaves the coil in the same direction as the positive current did.

So a few pages back,you said negative current flows in the opposite direction to positive current,and now it flows in the same direction 

Brad

[tinman]

Thanks. I didnt get into the sec vid.  And exactly on that last one.

I was on chat with someone that while we were talking, he inspired me to think beyond what is known commonly with the bifilar coils. He would not give me any answers, but made me think as we went along. So i came up with, is there a difference between the induction of 2 coils of a transformer if when the windings are separate, like side by side, or 1st layer and second layer, as compared to a bifilar winding used as a pri and sec for each conductor in the winding, and he said, "now your thinking"

So that is my next experiment. Never though to try that. Hopefully others will give it a go.  This was some weeks ago. I have recently thought, well what if we want a step up or step down? What happens with the extra turns of the step up secondary if it doesnt have any more primary to roll with?  Anyway, Ill go for the 1 to 1 and do some things to see if there is anything to it.


Mags

Mags

Your thoughts on my post-796 ?


Brad