Re: Overheating MOT - dual 833A VTTC

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Ed Phillips by way of Terry Fritz <teslalist-at-qwest-dot-net>" <evp-at-pacbell-dot-net>

Tesla list wrote:
 >
 > Original poster: "Mccauley, Daniel H by way of Terry Fritz 
<teslalist-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>
 >
 > I'm having some problems regarding my MOT (microwave oven transformer)
 > overheating with my dual 833A.  The size of the MOT is about 5" x 5" x 5" so
 > its a fairly large transformer, and actually its heats up considerably even
 > during lighter loading.  Do you think maybe proximity is a problem?  The
 > transformer is approximately 12" away from primary and underneath by about
 > 6" inches on a separate level.
 >
 > Also, if this problem is suspect, would mu metal help shield it???  I'd
 > rather not relocated the transformer if possible.
 >
 > I guess tonite I'll try removing the transformer and running it from a
 > distance to see if it still heats up considerably.
 >
 > Thanks
 >
 > The Captain

	Actually that is a pretty SMALL transformer for the power you are
probably running, and further it's not really intended for continuous
operation.  To keep cost and size down it's probably running higher flux
density (less iron) than "normal", which will cause no-load heating, and
more copper loss (smaller wire) (voltage drop and heating in the
transformer windings).  It's hard to believe you're that the core is in
a high enough RF magnetizing field to cause much heating from that
source.

Ed