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Re: How to make cheap big cores?



Original poster: "Steve & Jackie Young by way of Terry Fritz <twftesla-at-uswest-dot-net>" <youngs-at-konnections-dot-com>

Tony,

Usually there's more than one way to skin a cat.  What about several smaller
HF transformers in series-parallel so the power is distributed over several
(smaller & cheaper) cores?
--Steve
----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, January 18, 2001 8:06 PM
Subject: How to make cheap big cores?


> Original poster: "Tony Bryant by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<brd-at-paradise-dot-net.nz>
>
> Hi, I'm looking for a way to get a big HF transformer cores.
>
> Allstar magnetics have the perfect TDK EC120 cores in stock, but
> at the price of US$157ea for 10+, puts it way way outside my budget.
>
> Basically I'm looking for 3KW throughput. Its for an inverter welder/
> plasma cutter (yes I know this is the Tesla list, but there must be some
> overlap here r.e. transformer cores).
>
> As an experiment I obtained some magnetite (black beach sand),
> cast it into a core. Unfortunetly no measurable increase in permittivity
> (or is that permability?) over an air core.
>
> Next experiment will be to make an iron powder core.
> I intend to get some powder from a metal spraying supply place,
> dunk it in H3PO4 to get a black oxide layer, and then cast into
> a big toroid with a small amount of epoxy.
>
> Is this feasable?
>
>
>
>
>