Re: [CAD_CAM_EDM_DRO] Re: VFD for series 1 bridgeport

>
> On Sun Dec 23 21:14:00 2001, Raymond Heckert, <jnr@...> wrote:
>
> >Does anybody have any plans to make a high-power 3-phase inverter? I'm
> >thinking about charging a couple of BIG juicy capacitors through a
> >full-wave bridge, and use a sinewave synthesizer (3 of them timed 16666
> >microseconda apart) to feed a husky set of TRIAC's. I want about 15KVA at
> >230 VAC 3-phase. Any help would be appreciated.
> >
> >Best Wishes for safe & Happy Holidays!
> >
> >RayHex at jnr@...
>
> Well, not precisely, and I'm not sure how much help this might be, but I have a
> cookbook circuit that will take a 6 F clock and give you all 6 phases, (3 phases
> and their complements). It's square wave though, not sine. For the high power
> end the best I can come up with at the moment would be a MOSFET that'll do
> 1.2KV at 3 Amps 150Watts with a 4 Ohm on resistance. I suppose one could use a
> bunch of them to feed caps that then feed into a string of caps, but what kind
> of motor are you using that needs 15,000 Volts?
>

He said KVA, not KV, so that's 15,000 Volt-Amps or somewhere around 65 A.
Still one heck of a lot of power to be playing with. I think I'd go
buy one; it'd be cheaper than buying all of the power semiconductors you'd
blow up getting it working.

Paul


--
Paul Amaranth | Rochester MI, USA
Aurora Group, Inc. | Systems & Software
paul@... | Unix / Windows / NT