Re: inductor sizing

On Wed, 05 Mar 2008 09:00:36 -0600, John Fields
<jfields@xxxxxxxxxxxxxxxxxxxxx> wrote:

On Tue, 04 Mar 2008 19:38:55 -0800, John Larkin
<jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

On Tue, 04 Mar 2008 21:36:14 -0600, John Fields
<jfields@xxxxxxxxxxxxxxxxxxxxx> wrote:

On Tue, 04 Mar 2008 19:03:25 -0800, John Larkin
<jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

On Wed, 05 Mar 2008 02:22:18 GMT, Jamie Morken <jmorken@xxxxxxx>
wrote:

Hi,

For a filter inductor in an LC filter, does the inductor size (core
volume) scale linearly with inductance * current rating^2, all other
variables the same, ie. core material, frequency etc.

That's stored energy, which should be proportional to core volume.



Also I need some toroid cores for 200kHz LC filters, 250uH and 50Amps
peak current, are these going to be huge cores and what core materials
would be best to use, ferrite or powder cores?

I've downloaded the www.magneticsinc.com "Magnetics Inductor Design
Using Powder Cores" program:

Iron powder cores tend to burn their paint off in situations like
this. Permalloy powder is very good but expensive. The "Kool-Mu" cores
are almost as good, but cheaper. Gapped ferrites are OK here, too.

---
ISTM that, after the spec's were defined and the questions were:
"are these going to be huge cores and what core materials would be
best to use, ferrite or powder cores?", your response addressed
neither question and, while seemingly designed to assert your
guruness in matters magnetic, did little to help the OP...

Get a life, Fields.

---
There once was a fellow named Larkin
who thought that to him all should hearken.
Without thinking twice,
accept his advice,
not criticize, lest his thoughts darken.


Stick to designing 555 circuits; your career as a poet doesn't look
promising.

John

.

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