Re: MOT core

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

Original poster: "Hydrogen18" <hydrogen18-at-hydrogen18-dot-com> 

The only thing I know to say here is stack the cores. Alternatively you
could use very small wire for the secondary to achieve the HV output.
Stacking the cores(inserting 1 E into each end of the "bobbins") will halve
your power output but double your winding window.
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, February 01, 2004 6:49 PM
Subject: MOT core


 > Original poster: "Dan" <pbursa-at-cfl.rr-dot-com>
 >
 > Hello !
 > I am curious if someone here has experience with rewinding microwave
 > transformer.
 > I cut of the I part of the core, removed old windings and split the E core
 > in half so now I have two identical E cores .
 > Together they make 5.5 inches long, 4.15 wide and 1.35 thick core with
 > about 1.72 square inches area...
 > This looks like I'll need over 400 turns on primary... this would require
 > 40000 turns for 12KV secondary and there is not enough space for this, I'm
 > afraid.
 > My question is - if I use less primary windings (say 150 - 200), how it
 > affect performance, core saturation, ...
 > I noticed that original MOTs primary was also less than proper amount of
turns.
 > Also, since MOT core is welded together, how the weld affect the core
 > losses and eddy currents? isn't the very purpose of using laminated core
to
 > minimize these loses ?
 > How about potting finished transformer in oil ?
 > Thank you in advance
 > Vladan
 >
 >
 >