RE: New "MOT" power supplies??

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

Original poster: "Steven Ward" <srward16-at-hotmail-dot-com> 

Some features about the transformer i have.

1, the core has a HUGE gap in it, maybe 1mm.  Obviously this is how they 
make it push out 1kW!!  The core is easily disassembled and the windings 
are very easy to access and to modify ;)

2, There is good insulation between the core and coils!  Im sure you could 
series these.  The plastic bobbin is rather thick (maybe .5mm+), there are 
no gaps in it (its all molded) so it wont be able to creep to the core.
Also, there is a rather hefty air gap between the core and the plastic 
bobbin!  This means that oil could fill right in there for extra cooling 
and insulation. There is probably about 1mm of air between the core and 
bobbin.
Also, no connections are made to the core like in a standard MOT where the 
secondary is grounded with the core.

3, there are very very few turns on the coil.  It looks like only 15-25 
turns on the primary!  The secondary looks like 24awg, it might have about 
100 turns or so.  Also, with the secondary being segmented the way it is, 
they are easier to wind and dont require perfect winding techniques (like 
winding a home-brew flyback! been there, done that... a few times).

I would think that 4 to 6 transformers like these in series (which i think 
is VERY possible) would really kick out some power.  If one could find 
suitable cores surplus, then come up with a suitable bobbin, then we would 
be set!  Or better yet, someone find these actual transformers!  They only 
weigh perhaps a bit over 1 lb and are small!  The driver would not need to 
be giant either since the switching frequency is maybe 40khz or so (much 
easier than SSTC work in the several hundred khz..).

Steve Ward


>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: RE: New "MOT" power supplies??
>Date: Thu, 13 Nov 2003 07:21:19 -0700
>
>Original poster: "Daniel Barrett" <dbarrett1-at-austin.rr-dot-com>
>
>
>
>-----Original Message-----
>Original poster: Ed Phillips <evp-at-pacbell-dot-net>
>
> >       I can't imagine those things being useful for TC work, at least 
> not for
> > primary capacitor charging.  Maybe the rectified output would be OK for
> > a DC coil.  I suspect also that the line isolation isn't good enough to
> > allow stacking those things in series.
> > Ed
>
>         I dunno. From the pictures, it looks like the transformer has so 
> few turns
>as to be easy to rewind for 2X or 4X the original voltage. At that point you
>have an EXCELLENT supply for a DC coil. Plus, a little back engineering may
>show an easy way to increase the power. Add a little oil bath for the whole
>thing...
>db