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From: "John Smith"
Subject: Re: Core gapping techniques and general SMPS magnetics stuff
Date: Sat, 14 Dec 2002 22:45:39 -0600
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"Chris Carlen" wrote in message
> Things are finally beginning to click in my head about this magnetics
> stuff, thanks to the EM course. I realize now that in a transformer the
> only flux is the magnetizing flux, since the fluxes from the primary and
> secondary currents (excluding the primary magnetizing current) cancel.
> Hence high Al values are good to get magnetizing current down. Am I on
> track here?
> So I will have to gap my cores. How do you folks gap E-cores for
> prototype/low volume applications? Obviously it's not that hard to
> figure out a way, but I'm curious how others do it too. I'll probably
> cut out some shim material, epoxy it to the outer legs, and hold the
> halves together gently in a vice until it all sets up. Then I can soak
> it in acetone later for a day if I want to disassemble it.
I agree with another responder that gapping the outer legs is not a good
idea. You will have enough noise from your transformer even with the center
leg only gapped. I recommend you buy the core already gapped in the center
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