Stubblefield coils (bifilar) and speculations

[Michelinho]

Hi all,

A little reminder here about the importance of the bifilar coil.

A little experiment from the lab:

Starting with a magnetic motor made with a rotor with pm and the stator was cleaned from the original coils.

2 coils were wound 180 degree apart..

1-  First coil is 80 turns.
2-  Second coil is a bifilar 40 turns.

The frequency 18 Hz so 1080 rpm.



The results of the tests shows same potential but:

1-  First coil is 80 turns:  0.040 amp
2-  Second coil is a bifilar 40 turns:  0.080 amp

Always use bifilar coil where feasable.

Take care all

Michel & Al

[Michelinho]

@ Jenna

On 2 of my coils, rather quickly, the Fe wire became brittle and broke. I felt sure and still do that it was NOT metal fatigue caused by moving the wire back and forth to take measurements.

The possible Fe crystalline structure in a NS cell. I am sure NS saw that too at one time or another. Maybe the cell is draining the iron of a component? Carbon? Impurities?

I heard an explanation for it but don't recall what that was... 
I know that a log holder made of cast iron (forge too) will become very brittle when exposed to prolong high heat surrounding it.

I am still on it.

Take care,

Michel

Anyone knows?

[Michelinho]

Re: Bifilar coils.

I just got an email from a not sleepy son-in-law.

He went back to the lab and placed those two coils in series (phase) and measured: 0.120 amp   ??

Have fun.

Michel


Edit: A battery circuit in series would not add the currents, the coils do.

[ramset]

Bill @all have a look at this coil  http://www.youtube.com/watch?v=Kdup42Epq0o[posted by sirmikey1] if you have already seen this' apologies'
Chet

[Michelinho]

Hi all,

I tried a NS cell in tiny tpu format, much simpler to wound.

Coil:

8 feet steel strap 1/4" wide (measuring tape blade stripped and heated red for faster rusting).
8 feet copper tape 1/4 wide with glue on 1 side. (50% efficiency until glue is denatured)
8 feet cotton insulator sleeve on steel strap.
Duct Tape for sealing. (Red Green Stuff) 
I.D. 1 3/4"
O.D. 2 1/2"
Height: 3/4" with coton and duct tape.

Did not check the amp.

Initial potential: 0.313 Vdc
24 hrs later: 0.588 Vdc
Recovery from short takes about 1 min to 0.588Vdc.

Looks promising for the larger unit which will have a mass about 100 times larger. That's next week.

Take care,

Michel


EDIT: Just for fun I hooked a 9V battery on the cell and guess what? 1.5 volt so far, pure galvanic action. It slowly went down when the battery was disconnected and stabilizing at around 0.615V.