We are in need of the following equipment: static or rotary
single-phase to three-phase converter.  Rotary converter is preferred.
 The input voltage (single-phase) is between 110-120 VAC (typical
house/office/shop value).  The output voltage (three-phase) is between
110-120 VAC (L-N), depending on the input voltage.  The output
connection must be wye (Y) such that a line-neutral connection between
any of the phases (i.e.: A-N, B-N, and C-N) provides 110-120 VAC.  Of
course, the output would be phase-shifted so that the three phases are
120-degrees apart from each other.  Two wires in ... four wires out.

After doing much searching, the only units consisted of 220-240 VAC
inputs, which means that a step-up transformer would have to be
installed between the wall source and the converter (1:2).  And a set
of three (3) step-down transformers would need to be installed after
the three-phase conversion has taken place.  This type of
configuration entails too many equipment pieces and would overtake the
limited space availability for installation.

The unit must be mountable on a vertical structure, with provisions
for (safe) connections such as conduit runs to the unit (with the
connections made internally in the unit).  The dimensions of the unit
must not be overwhelming (1'x1'x1' would be an acceptable maximum).

Can you please provide me with manufacturer website with this type of
product?

Some non-suitable products were found at:
http://www.kayind.com/index.htm
http://www.phase-a-matic.com/index.html

Thanks.

Hello Ckashrafi,

I have a few found a few manufacturers that should be able to handle your
needs. Most likely this will be a custom order or adaptation of an
existing product.

The site I kept getting referred to from several other sites
is a company in the United Kingdom (England, Wales). The page at
  http://www.isomatic.co.uk/3phConverter.htm
describes the use of converters in general and near the bottom the
section labeled "Options" indicates that single phase 110V input is
available through use of a "booster".

I found under "frequency conversion", a company named Georator Corporation
located in Manassas Virginia that produces a variety of products. The page
  http://www.georator.com/design.htm
allows you to design your own solution. You should be able to choose 110V
single phase input at 60HZ and three phase output to get a device to meet
your needs. You could also call 1-800-523-9938 to get connected to their
application engineering group.

International Computer Power in Industry California, has a product named
Ultra Phase (http://www.rotoups.com/products/ultra1.shtml) which claims
to be factory configured for any input (and output) voltage and frequency.
From the picture, the unit may be too large for your use and I am pretty
sure it does not use rotary conversion (from the description). I suggest
contacting the manufacturer to be sure.

If you need additional suppliers I would expect a number of companies
would be willing to "design your own solution". A search phrase such
as +custom phase conversion provides a list of companies such as...

http://www.virtualtechnologiesltd.com/Power_Supplies/alt_energy_power.htm

http://www.willett.ca/product.htm

http://www.tdipower.com/acp/prod.htm

and others.

The other suggestion I will make is to consider if your design could
be changed to use 208V (or 230V) three phase power. Many more companies
had products that appeared to provide that kind of power and the overall
cost of your product may be less than with a custom power converter.

Please let me know if this answer doesn't meet your needs and I will dig
in a little more to clarify the answer.

  --Maniac