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From: Ken Smith
Subject: Re: Magnetically Shielded Inductors
Date: Wed, 2 Oct 2002 17:18:11 +0000 (UTC)
Organization: a2i network
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org>
NNTP-Posting-Date: Wed, 2 Oct 2002 17:18:11 +0000 (UTC)
In article <email@example.com>,
Bill Sloman wrote:
>Ken Smith wrote in message news:...
>> In article <firstname.lastname@example.org>,
>> Bill Sloman wrote:
>> [.. I wrote ...]
>> >> I have also found that EFD cores have fairly low external field.
>> >Compared with what?
>> Compared to "Shielded inductors" of the bobbin core type and the ones like
>> the Coilcraft DS-5022 series. The reasons for the low external field
>> seem to be the fact that the gap is on the center leg only and the two
>> legs shunting the field.
>That *is* interesting. I'd have expected that the shielded inductors
>with a cap going most of the way around the core would have done
>better. Could be that the EFD cores are made from higher permeability
It could be the material but I think it is more to do with the shape of
the core. With an EFD core, the gap is in the middle of the object. In
the DS-5022, the gap is at one end. I suspect that if we did a model of
the situation, we'd find that the gap in the middle radiates less.
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