TinselKoala's Magnetics Workbench

[0c]

Nice work Michel. Maybe I should be asking you these questions?   

Have you checked the magnetic fields of the coils during alternator operation?

0c

[TinselKoala]

Just to be clear, there seem to be 2 types of "bifilar" coils that people use. The first, the Tesla bifilar (512340) has parallel, same direction current paths. The other type, that I will call the "Stubblefield" type (thanks Bill) has opposing current paths, hence cancelling mag fields.
It would be good for posters to specify which type they are discussing, just to be perfectly clear.
I and 0c are mostly concerned in this thread with the Tesla type. But I welcome all (relevant) comments.
Thanks...
TK

[0c]

Just to be clear, there seem to be 2 types of "bifilar" coils that people use. The first, the Tesla bifilar (512340) has parallel, same direction current paths. The other type, that I will call the "Stubblefield" type (thanks Bill) has opposing current paths, hence cancelling mag fields.
It would be good for posters to specify which type they are discussing, just to be perfectly clear.
I and 0c are mostly concerned in this thread with the Tesla type. But I welcome all (relevant) comments.

FYI: Wire wound resistors use something very similar to a Stubblefield coil to cancel out magnetic fields and reduce inductance.

[Michelinho]

Just to be clear, there seem to be 2 types of "bifilar" coils that people use. The first, the Tesla bifilar (512340) has parallel, same direction current paths. The other type, that I will call the "Stubblefield" type (thanks Bill) has opposing current paths, hence cancelling mag fields.
It would be good for posters to specify which type they are discussing, just to be perfectly clear.
I and 0c are mostly concerned in this thread with the Tesla type. But I welcome all (relevant) comments.
Thanks...
TK

The Stubblefield cell is not like the Tesla coil, the iron wire and copper wire are not connected together. They are wound side by side to increase the area of exchange in the electrolytic process. The iron wire and iron core are used to magnify the magnetic effect of the cell. Although called bifilar wound, they are indeed the anode and cathode of a battery in close proximity and far related to Tesla's own.

Take care,

Michel

[TinselKoala]

Thanks, Michelinho. So we really have 4 types, then--the Tesla type, flat, single wire not non-inductively wound; the Stubblefield type, wound with dissimilar metals, maybe inductive maybe not, and the Bedini type, multiple windings maybe inductive maybe not, and the non-inductive wound resistors that 0c mentioned, definitely bifilar non-inductive.

Thank goodness I am only going to be looking at the first type, for now!!

I just finished winding another identical Tesla type flat bifilar to match the other one in the video. So I will try to do the same test as above with the two Tesla bifilars.

If I can stay awake long enough tonight.