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From: John Woodgate
Subject: Re: welding a transformer core
Date: Tue, 17 Dec 2002 07:13:54 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Tue, 17 Dec 2002 13:56:04 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Gibbo
wrote (in <firstname.lastname@example.org>) about 'welding
a transformer core', on Mon, 16 Dec 2002:
>No quotes as non are applicable.
>Can someone please explain to me why someone would want to weld the separate
>laminations of a transformer core (which are specifically made to have a
>non-conductive surface) together and thereby dramatically increase core losses
>What have I missed ?
Welding the E and I lams together at the edges proves not to cause
unacceptable losses. The welds have rather a small cross-section and a
high resistivity. In fact, because the welds are made with the E and I
blocks pressed tightly together, losses due to the air-gap are
minimised. Performance is comparable with that achieved with interleaved
core stacking, which is a time-consuming process, even when automated.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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