This single phase/3 phase issue has been with us for a very long time. All electric motors work by magnetic impulse regardless of their type. The big advantage 3 phase motors have over single phase is a more frequent impulse count per revolution. In other words, they are smoother and smaller for a given power. The dilemma in the US is that 3 phase power only exists in industrial zones and it is very expensive to bring elsewhere. In the past we had pseudo 3 phase generators using single phase input and idler motors as the only affordable solution, but things have changed today. Inverter technology has improved by leaps and bounds. Inverters now can produce very smooth digitally created sinusoidal output both efficiently and inexpensively with very high reliability. We see this most in VFDs, but inverter use has popped up everywhere, including UPS systems. These make a lot of sense, as they can be powered by a multitude of different sources. Where whatever energy source is available, it is converted to DC. This DC can be stored in batteries and/or directly used to produce eclectically quiet, sinusoidal, voltage correct, smooth AC single or 3 phase at any frequency one desires. Most importantly it can done at less cost than either wiring in a 3 phase service or a mechanical pseudo 3 phase system and every day the cost of these inverters drop. I think today, it is the only way to go.