After answering an earlier question to Rob about cores in low frequency
tank coils, something hit me. What if the core had a series of holes
close together about 1/2" in diameter all around its circumference. This
would look something like taking a piece of perforated steel or aluminum
having 1/2" holes and wrapping it up into a tube. The spacing would need
to be a little farther apart, and have a staggered pattern, in order to
turn groves for the conductors. Another route would be to burn or
machine longitudinal grooves about 1/4" wide, spaced about every 1/2"
apart around the circumference. Actually the wire groves could be made
first before the air holes. This would allow the lathe operation to be
made without an interrupted cut. When mounted in an air flow, this would
allow cooling of the coil. With todays technology, any material could be
machined with a laser, forming the holes on a CNC machining center. It
can't burn because the assist gas is a noble gas like Argon or C02. It
couldn't ignite and would be cooled immediately. Even using high speed
tooling, like a two flute end mill, would fly through this material like
butter. I would bet that this step wouldn't add much to the price
either. This would make an extra stout form with the cooling advantages
needed. That would be the berries in a rotary inductor too! The reason
for this posting is that if anyone from an inductor manufacturer happens
by here, they can have the idea. Any thoughts on this?
Will Matney
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