TinselKoala's Magnetics Workbench

[Pirate88179]

Oc:

The Stubblefield coil is actually a self-energizing electro magnet in itself.  It is also a primary which, with the addition of a secondary, can produce ac.  We did many experiments using a compass and the results were both interesting and confusing. But, if this does not help in your research, I can understand that.  Stubblefield's coil is the only one I am familiar with.  I never tried Tesla's.

Bill

[0c]

The Stubblefield coil is actually a self-energizing electro magnet in itself.  It is also a primary which, with the addition of a secondary, can produce ac.  We did many experiments using a compass and the results were both interesting and confusing. But, if this does not help in your research, I can understand that.  Stubblefield's coil is the only one I am familiar with.  I never tried Tesla's.

Stubblefield coils may very well be worth looking into, but should be under a different topic. This is the "Magnet Motors" topic, the "Magnetics Workbench" thread, and the question at the moment is about "magnetic properties" of a Tesla bifilar coil, which TK has already constructed.

If you have questions about Tesla bifilar coils, now is the time to ask. Let's see if we can learn something here before things get too chaotic, OK?

0c

[TinselKoala]

Now, now, let's not get snippy. I think maybe 0c isn't getting enough sleep. Neither am I, for that matter.
I didn't have time to break out the big guns today, but I did manage to test the two coils on the little GenRad RCLomometer.
The coils don't differ much at the two frequencies used, 120 Hz and 1 kHz. The Tesla bifilar reads 0.032 milliHenrys at 120 Hz and 0.0141 mH at 1 kHz. The pancake coil reads 0.033 mH at 120 Hz and 0.0151 mH at 1 kHz. I couldn't get a good capacitance reading on this instrument.
I'll try some active experimentation tomorrow if I have a chance. The local TC expert was watching and expressed an interest, and mentioned the patent, and we talked about the interturn capacitance for a while. It's been a long time, but I seem to remember this could be useful...

[Pirate88179]

Yes, snippy is a good word.  I am sorry I tried to help.  Good luck to you.

Bill

[0c]

Now, now, let's not get snippy. I think maybe 0c isn't getting enough sleep.

Sorry 'bout that. You're right about the sleep.