"Jim Adney" wrote

Well, it's important to keep in mind that the V and I approaches
to
flux use completely different formulas. They are both RIGHT, but
one
(the V method) is a LOT easier to get close answers with.

But it is indirect. It depends on frequency. Current does not.

But now we have Gerald, who seems to know what he is on about.

cheers, Ian

On Sat, 12 Jul 2003 21:05:31 +0100 "Ian Iveson"
wrote:

"Jim Adney" wrote

Well, it's important to keep in mind that the V and I approaches
to
flux use completely different formulas. They are both RIGHT, but
one
(the V method) is a LOT easier to get close answers with.

But it is indirect. It depends on frequency. Current does not.

But you only know the current if you also know the inductance. Then
you can add in f and find the current.

This only works if you're willing to "design" by trial and error: That
is, make up a prototype, measure the L and whatever else you're
interested in and then make another guess to refine the "design."

If you work from the V perspective you can just work thru everything
before making your first prototype. That's what I do, and that's what
the people I buy custom transformers do. I know they get quotes back
to me in less time than it would take to actually build up a
prototype, and the calculations can all be computerized these days so
they only take a few moments to actually figure out what is needed.

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Jim Adney
Madison, WI 53711 USA
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