Jerry wrote:

A 3 phase motor will supply nearly full power
when running on single phase, but it will stall much more easily than when
it has 3 phase power.

I see a slight contradiction in this statement.


If all 3 of your 4 KW motors are spinning at the same time from the same
power connection, you will have made your own 3 phase power within the
unit's wiring anyway.

And you only have to feed in 1/3 of the wattage.
Quick, quick! To the patent-office! :-)


Nick
--
The lowcost-DRO:
http://www.yadro.de