Re: MOT problems/strange MOT?...Please Help!!

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

Original poster: "Hans Scholze by way of Terry Fritz <twftesla-at-uswest-dot-net>" <hanscs-at-eagle.ptialaska-dot-net>

Mike,

>From what I can tell, those extra wires are for a low voltage/high current
winding that drives the filament of the magnatron.  I have a couple of MOTs
like this and I just leave the extra winding disconnected.

Hans


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, February 25, 2001 8:07 AM
Subject: MOT problems/strange MOT?...Please Help!!


> Original poster: "Mike Waddick by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <Mikew-at-winternet-dot-com>
>
> Hello all,
>
> I am currently working on a dual MOT power supply with voltage
doublers/level
> shifters. The mots i got i have no specs on, but i got a mesured output
voltage
> of 2kv, this seems about right. the Two Mots are exactly the same and they
run
> at the same voltage. The cores are hooked together as ushual. For my level
> shifter i used two 2100v 1uf MOT caps on each leg of the mots and i used 2
> strings of 22 1n4007 diodes. It is set up just like every other MOT power
> supply out there. One thing that seems to be alittle different from each
design
> is the connection between the middle of the diodes and GND. I have it
connected
> to GND.
>
> Ok this seems all right doesn't it?
>
> Well one thing is my MOTS are alittle wierd, if someone has ever seen this
type
> please give me alittle info. Well the MOTS are alittle wierd because they
have
> three HV outputs. There is on to the core and there are 2 on the secondary
> windings. The ones on the secondary windings are kind of wierd. They are
both
> connected to the core and one has a resistance to the core of 60 ohms and
the
> other has a resistance of 100 ohms. Between the two termianls there is a 1
ohm
> difference. If i short the two outputs on the secondary it starts to burn
and
> gives some smoke, but the MOTS seem fine. They both are connected to the
core.
> I even have tryed connecting one of the outputs to the core, and all it
does is
> draw ALOT of current. I also mesured the output of both of the terminals
to GND
> and i got the same voltage. Can anyone explain these MOT's?
>
> The thing that seems to be very unushual is that i am only getting 3kv per
leg
> after the level shifters. This doesnt seem right. That means the level
shifters
> are only giveing a 1kv increase. This is the same if the MOT's primarys
are in
> phase or out of phase. It makes no difference it still gives a final
output of
> 3kv per leg.
>
> I have tryed everything i can think of and i have asked everyone i know
and i
> have gotten responces from "that circuit isnt a voltage doubler"  to "Your
MOTs
> are bad".
>
> So any help would be very helpful.
>
> Thanks alot,
>
> Mike Waddick
>
> <http://www.winternet-dot-com/~mikry>Http://www.winternet-dot-com/~mikry
>
>
>
>
>