Re: 3-phase DC power supply

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Yurtle Turtle <yurtle_t@xxxxxxxxx>

You can always buy a used VFD from eBay. There are
many 120 and 240 volt single phase VFD's that output a
range of three phase voltages. You didn't say what
size the PSU was, so I'm assuming a 1-2 Hp VFD would
suffice. I'm also assuming a VFD's ugly waveforms
won't piss off your PSU too much.

Search eBay for words such as "drive", "VFD", and
"inverter". You'll get a lot of useless hits, but once
you find any drive, you can always click on "view
seller's other items".

Be sure the drive is complete, and doesn't need a
separate faceplate or anything.

Of course, if this is a 25 kVA PSU there's no hope of
getting anything that size in a 240 single phase to
240 three phase.

Adam

--- Tesla list <tesla@xxxxxxxxxx> wrote:

> Original poster: Ray von Postel
> <vonpostel@xxxxxxxxxxx>
>
> Tesla list wrote:
> >Original poster: Russell L Thornton
> <Russell.L.Thornton@xxxxxxxx>
> >
> >
> >Hi guys,
> >A friend of mine has a 30 KV, High current DC power
> supply that we
> >want to drive a new coil with. We plan to use a
> high power radar
> >switch for the gap.  The problem is the power
> supply is 3-phase and
> >we only have 220 available.  Does any one have any
> experience with
> >this or any suggestions on how to power this
> monster.
> >Thanks,
> >Russell
> >
>
>
>
> Hi Russell:
> The conversion of 220 single phase to 220 three
> phase is a common
> problem. I am aware of 2 types of converters.  The
> first is the
> capacitive converter and the second is the rotary
> converter.  They
> are rated in horse power and each has it's own
> advantages.  Suggest
> you run a search on the internet for "phase
> converter" to see which
> one meets your requirements.  I just bought a 2 HP
> rotary converter
> to run a 3 phase 220 volt, 1 HP motor from 220
> single phase.  This
> was for use on a machine tool and not a Tesla coil.
> The rotary
> converter was about $450.   An additional expense
> would be  a motor
> starter to connect between the 220 single phase and
> the rotary
> converter.  This was on hand so cost me nothing.
> Once you know the
> size and type you need you should be able to save
> some money on ebay.
>
> Ray
>
>
>