Re: MOTs & Thoughts

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

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <FutureT-at-aol-dot-com>

In a message dated 7/21/02 6:18:36 PM Eastern Daylight Time, tesla-at-pupman-dot-com
writes:

Steve,

I've seen similar results in stacked MOT tests I did.  The distorted
waveform is actually excellent for VTTC's and actually helps to
produce the elusive sword-like sparks.  My guess is that if you
remove the shunts, the MOT's will saturate at an even lower
voltage.  I may have tested that, but I can't remember.

cheers,
John


>
> Original poster: "S & J Young by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <youngs-at-konnections-dot-net>
>
> I took some no load measurements on a 4 MOT stack that some of you might
> find interesting.  All 4 MOT primaries are in parallel, and are powered by a
> 120 volt variac.  Here are no load primary volt vs amp measurements:
>
> Volts                    Amps
> below 75              less than .5
> 80                         1
> 95                         2
> 90                         3
> 95                         4
> 100                        5.5
> 105                        7.5
> 110                      10.5
> 115                      14.5
> 118 (max)           17.6
>
> As you can see, the MOT cores start serious core saturation at around 100
> volts, or about 85% of their rated voltage.  The moral of this story is to
> design your MOT stacks to produce the output you need without exceeding 85
> or 90% of the normal primary voltage.
>
> Question:  Suppose I knock out the magnetic shunts.  Would the above
> measurements be much different??
>
> Another thing to be aware of is that above 90% of normal input voltage
> causes significantly distorted sine waveforms that sometimes have strange
> effects on DVMs, causing them to indicate quite inaccurate measurements.
>
> --Steve Young
>
>
>