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Re: PIRANHA-III Power control? (fwd)
Original poster: Gerry Reynolds <greynolds@xxxxxxxxxx>
---------- Forwarded message ----------
Date: Sun, 17 Dec 2006 20:35:06 -0700
From: Terrell Fritz <terrellfone@xxxxxxxxxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: PIRANHA-III Power control? (fwd)
Hi,
The Router Controller is just a plain dumb dimmer circuit with heavy duty
parts. I little report is here:
http://drsstc.com/~piranha/PIRANHA/PIRANHA-3/RouterSpeedControl.pdf
The internal circuit is a standard simple Triac dimmer type circuit with
minimal parts.
I t appears they are "all the same" since the external layout of various
version is identical.
http://www.grizzly.com/products/G3555
http://www.mlcswoodworking.com/orderstatus/html/smarthtml/pages/speedcon.html
http://www.woodzone.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=828122
http://www.rockler.com/ecom7/product_details.cfm?offerings_id=10760&cookietest=1
A company in China probably turns out a million an hour :-p I was a
little surprised to see the "ST" triac in it, but realizing that in China
"any part" can be "labeled as you wish" ;-)
However, it might be simple to "add" a few parts to it for the ST pulse
design... It has most of the "stuff" all there ready to go as is...
Hmmmmmm...
The MOTs I used are not modified (normal shunting).
Cheers,
Terry
At 05:16 PM 12/17/2006, you wrote:
>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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> >
> >