I had ever to contact with a microoven transformer manufacturer,the list price
for 1000w microwave oven's only $10/ea. the core not hypersil and the the
wire's material is Al,Not Cu.
73!Hsu
----- Original Message -----
From: "Herzog" <herzog@frontiernet.net>
To: "Ham-amps" <amps@contesting.com>
Sent: Thursday, March 12, 2009 9:06 AM
Subject: [Amps] microwave transformers
> RE: Dittos from all I have learned about MOTs about the only thing
> they will
> do correctly is run a microwave oven. They have too few turns in the
> primary
> so the transformer runs hot and lossy, the magnetic shunts limit output
> current
> and the welds along the edges of the laminations act like a big shorted
> turn,
> so the transformer runs hot and lossy. The transformer pulls several
> hundred watts just idling with no load. Did I mention they run hot and
> lossy?
> They were built with one thing in mind - maximum cheapness.
>
> It is a shame because they look so tempting to use. But for all the work
> and aggravation of trying to rebuild them, grinding off the welds
> across the
> laminations, knocking out the magnetic shunts, possibly adding turns to
> the
> primary, you might be much better off to just buy some laminations and
> build your own transformer. Plus you will learn something by building
> your own transformer and it is fun!
> =================================
> How about putting two transformers, with the primaries in series, and
> the secondaries in parallel.
> Or if need more use 4, two primaries in series, then in paralleled.
> The whoole microwave is just too cheap to not use them; unless space,
> etc is the object, not just price. K 2 L B.
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|