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Re: Ballast Inductor
Just two more questions about my ballast, and then I'll leave you alone
(well, not really, but anyway):
I was hoping to check my understanding of the saturation you mentioned.
That is when the iron is being subjected to just as much magnetic flux as it
can handle, and any flux beyond that amount just ignores the iron and moves
through the air around it, right? Thus you lose the prime benefit of the
iron core (more inductance in the same space as an air core). So there is a
practical limit to how much current can travel through an inductor, based on
the cross section of the core. I think that explains my understanding
fairly well, does it make sense? For approximately 20-30 amps peak, would
the 2" I.D. conduit hold enough iron in the 1/8" welding rods to not
saturate? Or should I rebuild a 4" or maybe 6" version?
I should have mentioned this next piece in my first post, but here it is:
the welding rods are each copper plated. They consist of a core of mild
welding steel, with a copper coating. Is this a bad thing? I think
somebody else asked this question before, but I am doubting my memory of the
answer. I polyurethaned the individual rods before bundling them up and
then coated them again to lock them together, so there is no continuity
between adjacent rods. I am still concerned about the shorted turn
potential with these copper coatings. Of course the iron itself would make
a shorted turn too (hence the need to make transformers with thin
laminations...), so maybe I will be OK.
Any thoughts would be welcomed!!
BTW: I don't have a pole pig, or even a working coil yet, but I do have a
stack of NST's, NST filter parts, a primary coil wound on a lexan form, and
more recently a 4" sch 40 secondary wound with #22 wire + polyurethane, a
whole bunch of DigiKey AC caps (PFC), and a whole bunch of DigiKey/Panasonic
pulse caps soldered to perfboard (MMC).
I'm playing with this ballast because #10 is easy to wind, and I would like
to have complete understanding of large inductors + high voltage (120,240,
etc) + high current before I venture down the pole pig way (well into the
Enough run on sentences, Thanks for your help.
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