Re: MOT power supply

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

Original poster: "Black Moon by way of Terry Fritz <twftesla-at-qwest-dot-net>" <black_moons-at-hotmail-dot-com>

Old news.. theres also a url somewhere about hooking mots back to back
ie, hook two mot seconarys in par, and use the two mots as a 120 to 120 
isolation tranformer, revirse the ground connection for the 2nd mot of 
course, and you add isolation for running more mots in series
Iv heard if you put over 2x a mots voltage across its insulation, it usally 
fails, but 2x is usally ok.

>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: MOT power supply
>Date: Sat, 16 Nov 2002 19:59:20 -0700
>
>Original poster: "Steveh by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
><steve.g.hall-at-attbi-dot-com>
>
>Mark,
>
>I don't think it would be possible to run a typical 120V MOT at 240V. I did
>some analysis on a few of my MOTs. By measuring the cores cross sectional
>area and counting the number of turns on the primary, it is a simple matter
>to calculate the flux density. The result was 20,000 gauss for all of my
>MOTs. This happens to be the absolute maximum flux density for typical
>silicon-iron used in transformer cores. This was no surprise, MOTs are
>designed with one goal in mind - CHEAP!
>In other words, a typical MOT is on the verge of saturation at its intended
>input voltage. Increasing the voltage much beyond 120V will result in large
>amounts of current being drawn with little increase in output voltage.
>You could, however, connect two MOTs together with the primaries in series
>and the secondaries in parallel, observing proper phase, of course. This
>would allow you to use 240V for power. I also don't see any reason why one
>couldn't connect larger numbers of MOTs together in a similar fashion. Even
>numbers would be used with primaries series connected in pairs, multiple
>pairs would be paralleled. The secondaries could probably be wired in pretty
>much any combination of series/parallel for the desired output current and
>voltage. It would probably be best if all transformers were identical, but
>that may not be an absolute requirement.
>Any thoughts on this?
>
>Steve
>----- Original Message -----
>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: <tesla-at-pupman-dot-com>
>Sent: Friday, November 15, 2002 9:05 PM
>Subject: MOT power supply
>
>
> > Original poster: "Mark Rossman by way of Terry Fritz <twftesla-at-qwest-dot-net>"
><marossma-at-oakland.edu>
> >
> > Has anyone built an MOT power supple with an imput voltage of 240v  with
> > transformers that came from a 110 volt microwave. Im assuming that the
> > primary windings could easily handle the higher voltage, but i thought id
> > ask before i hooked it up.
> >
> > Thanks a lot
> > Mark
> >
> >
> >