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From: John Popelish
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Subject: Re: Transformer with magnetic shunt?
Date: Tue, 07 Jan 2003 04:55:01 GMT
NNTP-Posting-Date: Mon, 06 Jan 2003 23:55:01 EST
David Harmon wrote:
> I am modifying a transformer from an old microwave oven in order to
> build a spot welder similar to the recent discussion in the "welded
> transformer" thread. My transformer had the primary and secondary
> side by side, so it was relatively easy to cut and remove the
> secondary winding.
> Between the primary and the secondary windings, there are some
> stacks of laminated iron that I did not expect to see. It looks to
> me like they would shunt some of the magnetic flux away from the
> secondary winding and prevent the full power from the primary from
> being coupled into the secondary. Isn't that a bad thing? What is
> the purpose of those bits?
> Should I leave them there or knock them out before I put in the new
> 1-turn secondary winding?
> Picture in alt.binaries.schematics.electronic under the same subject
It is probably a good idea to leave them in. They provide a current
limit when the secondary is short circuited. This is very useful when
welding. It is equivalent to connecting a series inductor in the
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