phase converters

[m_c]

I don't have experience of running motors that big, but you're looking at 30A current at 240v under full load for each motor, and start up current is going to be far higher, which you'll really struggle with using any normal single phase supply.

[Jonathan]

Why not use a VFD? Obviously expensive for that size, but the starting current is much much less as you can set the acceleration to a long time. Still as m_c said 10hp/7.46kW is a lot for a normal supply, but will you actually be running the motors at full load?