Re: Mike Marcum Ferrite Cores

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: mecortner@xxxxxxxxxx 

>Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>

>You can buy a pole xmfr for the price of a large ferrite core. We
>sell 10 kVA, 14.4 kV/220 volt units for only $95!!


Actually D.C. I thought about that when I wound the thing
but as luck would have it I live quite a distance from
you. I'm in California, way up north near Mt Shasta and
shipping would be prohibitive no doubt. Actually I'm
seriously looking at what Terry's up to right now. You
know, when all this solid state stuff first started I
just thought it was a joke, a new/fun way to blow up
transistors, but the results are looking real now!
The newest design looks so simple that I might even
give it a whirl? Still for the life of Me I can't
figure out what that little 5uF poly cap is doing in
parallel with the C-drive caps's?

---- Matt Cortner ----


>Original poster: "Mike" <mike.marcum@xxxxxxxxxxxx>
>C-cores. Each one is 2.25" x 4" with a 1" square cross-section. 8 of
>these are being put together in a modified E with the 2x2" center the
>primary and the 4 secondaries on each side (can be paralleled or
>series'd externally to get 12.5-50kV with 370vdc in). I did it this
>way to minimise wire length for a given # of turns (litz is
>expensive) and have core gaps for built in current limiting. It's the
>P ferrite from Magnetics (
>http://www.mag-inc.com/ferrites/ferrite_e_i_u_cores.asp ). Part # is
>OP49925UC. Biggest non-custom core they have.


That is a pretty huge core size for sure! I know
from previous posts that your somewhat familiar
with esoteric technology so you might have an idea
what I'm up to. I'm also building an inverter, not
the solid state kind though, a rotary type with rare
earth magnets. I plan on driving a coil with it. What
I need to do is cast a special stator core configuration.
I plan on grinding up some ferrite cores on a wet wheel,
separating out the magnetic dust and mix w/ epoxy for
casting material. And I was curious as to what you
thought the suitability of the cores you have are to this
purpose? Also about what price did you pay per piece?
Thanks.

---- Matt Cortner ----