Re: MOTs & Thoughts

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

Original poster: "Crow Leader by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla-at-lists.symmetric-dot-net>

Nice scope captures.

The waveforms are really distorted and strange compared to say a plain
generic power transformer. The shunts are obviously there for a reason and
are probably why this is happening. Maybe there is saturation in only PART
of the magneric circuit of the transformer. If the entire core was
saturated, you'd get clipped waveforms, and be unable to draw any more power
from the transformer. Since it's drawing only say 60W of actual power, and
again magnetron tubes in a microwave oven use more than that, we know that
is not true. Also, as you increase the voltage, the losses in the
transformer don't appear to suddenly shoot up like the current. There is no
sign yet of a completely saturated transformer. If you can supply the
reactive current, what happens to heat losses when you go past 120 volts?

KEN

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, July 22, 2002 8:52 PM
Subject: Re: MOTs & Thoughts


> Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
>
> Hi Ken,
>
> I hooked up my MOT with a current monitor on the input and looked at the
> input and output voltages with no load on the output of the MOT.
>
> http://hot-streamer-dot-com/temp/P2002-7-01.jpg
>
> Here are the input voltages (top) and input current (bottom) at 90, 100,
> and 110 VAC:
>
> http://hot-streamer-dot-com/temp/Ken90Vin.gif
>
> http://hot-streamer-dot-com/temp/Ken100Vin.gif
>
> http://hot-streamer-dot-com/temp/Ken110Vin.gif
>
> After 90 volts AC, the input current suddenly starts to grow these big
> spikes.  Since they are 90 degrees out of phase (sort of), the power is
> probably low (I should have pushed the power button on the scope...**)
>
> Here is the output voltage and input current:
>
> http://hot-streamer-dot-com/temp/Ken90Vout.gif
>
> http://hot-streamer-dot-com/temp/Ken100Vout.gif
>
> http://hot-streamer-dot-com/temp/Ken110Vout.gif
>
> As I turn up the voltage, the output voltage seems to be hitting some
> ceiling in that it suddenly does not want to go much higher.  Seems to be
> saturating to me ;-)
>
> I wonder if this action could be beneficial in a microwave oven for some
> reason.  I don't think it would have been very hard to fix this if they
> wanted too.  It seems to be deliberate.
>
> -------
>
> **Realizing I missed a golden opportunity to push buttons, I went back and
> found the power input:
>
> http://hot-streamer-dot-com/temp/Ken80p.gif
>
> http://hot-streamer-dot-com/temp/Ken90p.gif
>
> http://hot-streamer-dot-com/temp/Ken100p.gif
>
> http://hot-streamer-dot-com/temp/Ken110p.gif
>
> Vin Real Power
> 80.3 28.87W
> 89.7 36.19
> 99.3 45.41
> 110 57.72
>
> So it is only burning about 60 watts at 110 VAC.  Saturating, but the
> current is still mostly 90 degrees out of phase so the real heating power
> is low.
>
> Cheers,
>
> Terry
>
>
>
>
> At 07:10 PM 7/22/2002 -0500, you wrote:
> >I want to see the voltage and current waveforms of these so called
> >"saturated" transformers. Show me clipped output voltage waveforms at no
> >load.
> >
> >do these "saturated" transformers dissipate 600 watts of heat?
> >
> >KEN