Re: More three phase fun...

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Hydrogen18" <hydrogen18@xxxxxxxxxxxxx>

On a similiar notion, you might find a big 1 phase motor and a big 3 phase
generator at a scrapyard. Hopefully, you'd know what to do with it.

Eric
----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Tuesday, January 18, 2005 5:31 PM
Subject: More three phase fun...


> Original poster: "Jim Lux" <jimlux@xxxxxxxxxxxxx>
>
> OK.. here's another idea.
>
> You want a BIG coil, drawing a bunch o' power (say, 10kVA +)
>
> you want to run off three phase (so you can use primary side chokes and
> resonant charging)
>
> You want to be reasonably portable (as in, it can be towed behind a
> reasonable sized SUV)
>
> You don't want to fool with all sorts of idler motors, big boxes of
> capacitors and such like to draw the 10kVA from your single phase service
at
> home (although, 10kVA is only 40A from the 240V service)
>
> You want to "own" the gear, as opposed to renting a big generator each
time
> you play with the coil.
>
>
> Get 3 inexpensive gasoline powered generators... (e.g. Coleman power mate
> 3750W @ 249 from PepBoys, etc.)
> http://www.colemanpowermate.com/generators/pm0523202_17.shtml
>
> Run them in parallel, phased 120 degrees apart.
>
> Now... you're going to say, How in the world do you do that??
> I'm not sure, yet, but I suspect you can do it the same way you can
parallel
> two generators.. You start them both, measure the relative phase (connect
> the "neutral" on both, put a lightbulb between the "hot", and adjust the
> speeds until the lightbulb stays out) and adjust until in phase, then
> connect the two together, after which, they'll remain locked (except for
> some potential problems with resonance, governor mismatches, etc.)
>
> So, I think, if you had some sort of "three phase" intertie (a smallish
> zigzag transformer, or even a small three phase motor), you could do this.
> The key is the intertie.. if one generator slows down a bit (retarding the
> phase), then it needs to draw less power, so it can catch up.
>
> Yes, these cheap generators are just that... cheap, noisy, etc.  However,
> you're running a big (presumably noisy) tesla coil with them. They're also
> heavy!  100 pounds each.
>
> I recognize that a "better" solution is probably to get a surplus 20kVA 3
> phase genset.
>
>
>
>