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RE: [TCML] interesting spark gap idea, lets work together
I've heard suggestions on using chokes on the line to the motor. My manual cautioned against that, so I didn't do it. I had filters to help isolate the incoming 240 from what went to my pig. I think others have successfully used VFDs and PLCs, so it can be done.
--- On Sat, 2/20/10, Jim Mora <wavetuner@xxxxxxxxx> wrote:
> From: Jim Mora <wavetuner@xxxxxxxxx>
> Subject: RE: [TCML] interesting spark gap idea, lets work together
> To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
> Date: Saturday, February 20, 2010, 4:53 PM
> Hello Yurtle, and esteemed Group,
>
> What precautions , if any, where in your gap motor inverter
> for hash? Or are
> all methods futile? I am in the process of building a HP
> 10" coil with a 17"
> rotary and 3/8 W electrodes. I want to use an AC motor.
> This will be in
> series with a well deigned and blown 5 gap .25" W gap set (
> a modified
> suggestion from Richard Quick some time ago). I would hate
> to loose my well
> integrated speed control (inverter) in a run. Maybe the
> group can make some
> suggestions or brain storm this lingering bummer?
>
> Otherwise, I am going to use my 1hp DC motor and control it
> with a variac
> and a heavily rectified AC from my control cabinet as
> suggested by Steve
> Young awhile ago.
>
> Thanks Much,
> Jim Mora
>
> Production VFD's are expensive!
>
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx
> [mailto:tesla-bounces@xxxxxxxxxx]
> On Behalf
> Of Yurtle Turtle
> Sent: Thursday, February 18, 2010 3:46 PM
> To: Tesla Coil Mailing List
> Subject: RE: [TCML] interesting spark gap idea
>
> Actually, I use my current gap at around 10 kVA on my 10"
> coil, as I've
> already blown up two VFDs and only have one left.
>
> http://www.classictesla.com/hot-streamer/adam/bigass_coil/coil09.jpg
>
> http://www.classictesla.com/hot-streamer/adam/bigass_coil/rsg1.jpg
>
> As you see, I had a vacuum gap in series with my three
> phase vfd rsg, as I
> found I got my best performance with this. I was actually
> running my motor
> as high as 150 Hz, with a series vacuum gap on a variac, to
> find the best
> combination.
>
> These photos are really old, as I now have a .1 nF cap and
> have raised my
> top topload as high as my 8' garage door will allow.
>
> After blowing my second vfd, I chose to build a shop vac
> gap, as a quick
> fix, and haven't been too disappointed. It may have lost a
> foot or so, but
> when you already have more than you need (or the neighbors
> can stand)...
>
> --- On Thu, 2/18/10, Lau, Gary <Gary.Lau@xxxxxx>
> wrote:
>
> > From: Lau, Gary <Gary.Lau@xxxxxx>
> > Subject: RE: [TCML] interesting spark gap idea
> > To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> > Date: Thursday, February 18, 2010, 5:09 PM
> > Good point - my experience was with a
> > 15/60 NST. But using a static gap on a pig-powered
> > coil is probably not the best choice anyway.
> >
> > Regards, Gary Lau
> >
> > > -----Original Message-----
> > > From: tesla-bounces@xxxxxxxxxx
> > [mailto:tesla-bounces@xxxxxxxxxx]
> > On
> > > Behalf Of futuret@xxxxxxx
> > > Sent: Thursday, February 18, 2010 4:37 PM
> > > To: tesla@xxxxxxxxxx
> > > Subject: Re: [TCML] interesting spark gap idea
> > >
> > >
> > > Gary L,
> > >
> > > If Gary W. used his vacuum gap on his large coil
> which
> > gave 12 foot sparks,
> > > the higher current in his gap may explain why he
> was
> > able to see performance
> > > changes even at higher blower speeds. It would
> > seem reasonable to me that
> > > the more powerful the coil is, the more air would
> be
> > needed to keep the gap cool
> > > and help to quench it. Maybe someone else
> > mentioned this already, I wasn't
> > > following the posts.
> > >
> > > Regards,
> > > John
> > >
> > > -----Original Message-----
> > > From: Lau, Gary <Gary.Lau@xxxxxx>
> > > To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> > > Sent: Thu, Feb 18, 2010 4:20 pm
> > > Subject: RE: [TCML] interesting spark gap idea
> > >
> > >
> > > That's an excellent point - using something to
> control
> > the blower speed. If
> > > using a vacuum cleaner AC/DC "universal" motor,
> a
> > triac-based lamp dimmer can
> > > be
> > > used if you want that instead of a variac
> (smaller
> > & cheaper). But my
> > > experience differs from Gary W's as far as the
> optimum
> > speed setting.
> > >
> > > I found that any speed beyond maybe 20% of full
> power
> > offered no difference in
> > > spark performance. It just made the vacuum
> > cleaner motor louder, which I really
> > > didn't want. And since a full-throttle vacuum
> > cleaned motor can draw 10-12
> > > Amps, I'd rather have as much of my 20 Amp
> breaker
> > budget going to my NST and
> > > not so much to the gap blower.
> > >
> > > Regards, Gary Lau
> > > MA, USA
> >
> >
> > <snip>
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxx
> > http://www.pupman.com/mailman/listinfo/tesla
> >
>
>
>
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