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From: Ross Ogden [SMTP:rossoggy-at-yahoo-dot-com]
Sent: Saturday, August 22, 1998 12:03 PM
To: Tesla List
Subject: Re: Iīm_puzzled_about_your_MOTS
Youu can pull big arcs it the electrodes are placed vertically because
the hot hot air rised and creates a lower resistance path. If the
electrodes are placed horizontally the ir rises pulling the arc away
from the electrodes. My mot was shunted but it still took 18 amps max
streched arc was 8.5 " not bad eh. By the way mot shunts dont look
like neon shunts. The shunts are between the primary pancake coil and
the secondry coil pancake. The shunts look like a number of steel
plates stacked horizontaly they dont work very well though.
---Tesla List <tesla-at-pupman-dot-com> wrote:
>
>
>
> ----------
> From: RWB355-at-aol-dot-com [SMTP:RWB355-at-aol-dot-com]
> Sent: Friday, August 21, 1998 11:49 PM
> To: fwd
> Subject: Re: Iīm puzzled about your MOTS
>
> To: Gregory R. Hunter [SMTP:ghunter-at-enterprise-dot-net]
>
>
> Hi Greg, ( I couldnīt reach you at your email adresse, so I have to
do it over
> the Telsa list)
>
>
> I live in Germany. I canīt really tell you from what microwave oven
I pulled
> the MOT.
> I just found it in a dumpster and not having a MWO at home and being
> technically interested, I put the thing in my car and took it apart
at home.
> The MOT is a 2.3kV-at-700mA unit. It has no magnetic shunts at all. It
did have a
> soft start circuit in the primary, which I stripped for parts
usage. As far as
> I could see, however, it only limited the startup current, not the
running
> current. I rigged the MOT up on a Jacobbīs ladder and measured the
primary
> current. It was about 18 Amps -at-220V. 2.3kV-at-700mA=1610Watt, which
means about
> 7.5Amps at 220V. So obviously, this transformer isnīt shunted. The
xformer got
> slightly warm (but you could still touch it) after about 2min of
operation. I
> could pull a standing arc apart aprox. 3 inches before it cut off.
> So, I still canīt understand how the guy could pull his 5 MOT setup
to 18"
> before it cut off. An experiment with a power supply of
10kV-at-100(!!) amps
> yielded a spark length of no more than 36" before cutting the flame
off. I
> doubt the MOTS would be able to supply 30 to 40 amps nec. for the
18" spark
> length.
> I never tried your idea of connecting a DMM (and shorting the hv
secondary of
> the MOT). My DMM was too expensive for this. (DMM/DSO combi + aux
inputs for
> rpm,air pressure, temp, cap, induc, etc.)
>
> Sorry I couldnīt be of more help,
>
> Reinhard
>
>
>
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