Sorry, I misunderstood what you were thinking. If I were doing this, I
would not simply drive the generator with no electric feed lines.
Induction generators do not work well when not connected to the power
grid. But they do work well if they are connected to the power grid.
So if you leave your RPC connected as is and change the pony motor to
a ten hp motor driving the RPC through a belt drive, it will work very
well. By leaving the RPC connected to electric power, you will not
have to generate that phase. You could probably get by with less than
a 10 hp motor.

About 25 years ago I made someone a three phase source using a 7.5 hp
three phase motor and a two hp single phase motor. It powered a
centerless sander that had a 5 hp three phase motor as I remember. It
worked well for some twenty years until the business was sold and the
sander was moved to a location with three phase power.


Dan