Re: MOT info

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Hydrogen18" <hydrogen18@xxxxxxxxxxxxx>

I agree with Mike definetly here, inductive ballasts are simply the best. As
for a 6 or 8 pack, I think you will need to disconnect the HV from the core
and put it under oil for sure.

Eric
----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Wednesday, December 22, 2004 2:22 PM
Subject: Re: MOT info


> Original poster: "Mike" <mike.marcum@xxxxxxxxxxxx>
>
> I wouldn't worry about the difference cost wise between 30A and 60A draw.
> Assuming you run it for an hour a day at ~14 kW (plenty enough to
> annoy/scare the neighbors/police/swat team) over a month that's $84 vs.
$42
> for ~7kW. I seriously doubt you'll actually run it that much before spark
> gaps need replaced, ears need a rest, etc. I think it's always easier to
> use inductive ballasting and cheaper. With caps you'd need lots of them in
> parallel to handle the 30-60A and you'd need lots of uF (about 100uF for
> around 25A limiting off the top of my head). I haven't actually tried this
> myself, but seems like the caps would heat up like resistive ballasting. I
> personnly would just use the hardware store ballast, (2) 500' rolls of
> 10-12 awg for 26A limiting.
>
> Mike
> ----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Wednesday, December 22, 2004 1:55 PM
> Subject: Re: MOT info
>
>
> >Original poster: Rich Simpson <richcreations@xxxxxxxxx>
> >
> >[sorry if this shows up twice, I used the wrong email account]
> >
> >I have seen the circuit that uses two mots wired back to back, then a
> >center taped mot stack, and I have seen the circuit that grounds the
> >"center" mots, and disconnects HV lines from the cores on the outer ones.
> >and I have seen greg's 4 mot stack that uses caps for ballast. as well as
> >various variations
> >
> >which of these seems to be the best, for a 6 or 8 mot stack?
> >
> >what about ballasting, I would rather not pull 50amps, 20-30amps would be
> >ok (I have a 240v/60a circuit to use, but at $0.20 per kw, I would like
to
> >limit the current draw. should I use caps as greg has done, or should I
> >wind an inductor  around some rebar or welding rods?
> >
> >-Rich
> >
> >On Dec 21, 2004, at 11:12 AM, Tesla list wrote:
> >
> >>Original poster: "Christoph Bohr" <cb@xxxxxxxxxxxxxxx>
> >>
> >>Hello Rich.
> >>
> >>I have build a 4 and a 6-MOT stack in the past and both
> >>performed pretty well in respect to power handling capability.
> >>
> >>I have the MOT's under transformer oil which keeps them cold and
> >>aids isolation. Though I did not disconnect the cores from the inner end
of
> >>the
> >>secondary winding I had no problems with arcovers during normal
operation.
> >>I experienced a primary to core flashover in one of the outer MOT's
once,
> >>but this was after exessive voltage rise while not using a safety gap,
or in
> >>other words
> >>this was my own fault.
> >>
> >>I did not remove the shunts but always wondered if I had better done
that.
> >>Maybe anyone else can advise on this.
> >>Howerever, these things are powerfull and cheap to build, but can be a
pita
> >>to
> >>carry around, but a pole-pig isn't a lightweight neither.
> >>
> >>regards
> >>
> >>Christoph
> >
> >
> >
>
>
>