19 Oct
2007
19 Oct
'07
12:09 p.m.
On Fri, 19 Oct 2007, Patrick Finnegan wrote:
You know, it's ironic this topic has come up, as I'm currently working on
converting my 3ph SGI Onyx to single phase and had looked into static and
rotary phase convertors. Having never had any reason to look at one before
I started anew - and decided quickly that they did not appear to be safe
for computer use.
Where I am the cost of installing three phase would likely be in the
quadruple digits (Ah, electricians, well paid princes of the earth).
Thankfully the conversion on the SGI is relatively trivial with the
appropriate bits and pieces, nevertheless I was wondering about the
chances of building an MG set to produce a stable three-phase source.
On the off chance I end up dealing with this problem again, and won't be
in a position to do a conversion, does anyone know about the math involved
to work out what kind of sizes of motors would be required to produce such
a contraption?
Thanks all;
JP Hindin
My feeling is
that if you have to power some three-phase big iron
from a single-phase source, it's probably better to take a look at
one of the modern (and expensive) solid-state converters--or get some
real three-phase distribution installed.
Or, of course, you could just find a big heavy single phase motor, and
pair it up with a 3phase motor of the same RPM rating with a
shaft-coupler, and make your own single-to-three phase MG set.