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From: firstname.lastname@example.org (Eric Y. Chang)
Subject: Re: Any good uses for old microwave over parts?
Date: Fri, 8 Nov 2002 22:36:28 +0000 (UTC)
Organization: California Institute of Technology, Pasadena
References: <email@example.com> <firstname.lastname@example.org>
NNTP-Posting-Date: Fri, 8 Nov 2002 22:36:28 +0000 (UTC)
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N. Thornton (email@example.com) wrote:
: Perhaps you can come up with a practical use for them yet: so far I
: have seen this subject tackled repeatedly in s.e.d., and still no good
: use has surfaced. A welder is about the only one that flies.
: I keep wondering if a single TF would be enough to make a really small
: spot welder. It could be overrun much more heavily than in an oven,
: since it would only run for a second per minute ish. It would
Hi. I have seen several successful applications of microwave oven
transformers on the WWW. One of my favorites is an electric vehicle
battery charger. It uses tapped windings to charge several batteries
in a serial string. The key to prevent overheating is to keep a load
on the secondary at all times. When the load is disconnected, the
charger shuts off so that the transformer does not overheat at low
load conditions. See archives in www.evdl.org for more details.
Other applications I have seen are welders. These use a combination
of SCR phase control and line inductors to prevent overheating. Also,
load sensing helps a lot. Finally, there is a thread in the electrochem
batteries newsgroup about a battery tab welder. This device uses a
solid state relay to time the input pulse. According to the thread,
this spotwelder works!
Are there any magnetics tricks to play that would help keep them from
overheating? The battery charger guy says knock out the shunts.
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