On Mon, 14 Sep 2026 20:55:41 -0300, Kragen Javier SitakerThat doesn't stop it from exciting a circulating current in a conducting core and heating it up in the process.
<kragen@canonical.org> wrote:
<snip>
I’d think that this is a case where you’d sort of prefer to use not justEddy currents are AC. This is ~ a unipolar pulse
an ungapped core, but a solid iron core, so that as much as possible of
the power would be lost by eddy currents in the core, mostly because
iron is cheaper than copper.
Iron can also handle higher temperaturesRL
than the copper or especially its insulation, but, if it were to come to
that, the hottest part of the iron would be in direct contact with the
copper, so I don’t think that would help much. Iron’s Curie point is
770°, well above the Curie point of things like ferrite (pure magnetite
is 585°) but both of those are well above the service temperature of
your insulation, unless you've sourced some of that exotic
ceramic-insulated wire Dalibor Farný uses in his Nixie tubes.
>
None of the above is validated by me burning up any inductors, though,
or even doing FEM simulations; it’s purely based on my fallible
theoretical understanding. Corrections would be welcome, especially
corrections based on actual measurement.
>
Kragen
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