Re: PIRANHA-III Power control? (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Gerry Reynolds <greynolds@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Sun, 17 Dec 2006 10:44:54 -0500
From: BRIAN FOLEY <ka1bbg@xxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: PIRANHA-III  Power control? (fwd)

Hi, a small inductance on the control input can help a lot with peak
current, and with a bit of design work can be made to limit the input
current to a value wanted. cul brian f.
----- Original Message ----- 
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Sunday, December 17, 2006 10:00 AM
Subject: Re: PIRANHA-III Power control? (fwd)


> Original poster: Gerry Reynolds <greynolds@xxxxxxxxxx>
>
>
>
> ---------- Forwarded message ----------
> Date: Sun, 17 Dec 2006 15:59:51 +0900
> From: Peter Terren <pterren@xxxxxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: PIRANHA-III  Power control? (fwd)
>
> You are concerned to avoid the near saturation wastefulness of the MOT's
> driven at mains voltage.  A dimmer switching at 90%  will be well past the
> peak of the half wave and hence past the point of near saturation I
suspect
> but with the current being 90 degrees slow I am not sure what will happen.
> Switching a transformer on at zero crossing gives the biggest current
surge
> (rather than at peak).  I'm sure the dimmer people have it all worked out
> but I'm not sure it will neccessarily work as expected to improve
> efficiency.
>
> Peter
>
> > ---------- Forwarded message ----------
> > Date: Sat, 16 Dec 2006 19:08:32 -0700
> > From: Terrell Fritz <terrellfone@xxxxxxxxxxxxxxxxxxxxxxx>
> > To: Tesla list <tesla@xxxxxxxxxx>
> > Subject: PIRANHA-III  Power control?
> > Hi,
> > I am working on PIRANHA III issues today.  A dual MOT system that runs
off
> > a 120VAC 20A circuit with ease.  It is in the 8 foot arc to ground
> > range...  About 2kW input at ~90% efficiency.
> > These coils like to run with the MOT input voltage at about 95-105 volts
> > to
> > stay out of the MOT saturation range which just waists precious
> > current.  Normally that is done with a 15 -20 amp variac...
> > http://drsstc.com/~piranha/PIRANHA/PIRANHA-3/PIRANHA-III-001.gif
> > Variacs are very nice, but they are real heavy and not real "modern" or
> > solid state.  The charging circuit (MOT / Primary Cap loop) is resonant
> > too
> > to drive up to a 15000 volt firing voltage...  But the waveforms are
> > pretty
> > "tame" and the power factor is excellent without any fiddling.
> >
> > http://drsstc.com/~piranha/PIRANHA/PIRANHA-3/PIRANHA-III-002.gif
> >
> > It would be super cool to use a beefy lamp dimmer circuit or some
similar
> > cheap but very reliable solid state thing to control power other than
the
> > variac.  The PIRANHA input section is very forgiving of sloppy input
wave
> > forms and all so no big deal there.  Ceiling fans are made for inductive
> > loads...
> >
> > I don't know much about dimmer circuits and such so I can't guess at
what
> > to do and feed the computer models well.  0:-|
> >
> > If anyone knows what to do to make a cheap hardy dimmer type circuit
that
> > could run two MOTs (~2kW)  I am all ears ;-))
> >
> > Cheers,
> >
> > Terry
>
>
>
>
>
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