We used to use a bunch of them in the computer business back when computers filled the room. They went from 208 60hz 3/p to 208 400hz 3/p tho. Same basic machine.
Your talking about a motor generator, a RPC uses a 3Ø motor to manufacture a phase from a single phase supply to operate 3Ø motors on a 1Ø supply. Most are self starting, some home built models use a "pony motor" to bring them up to speed, & then idle them, (all of them single phase the idler motor).
There are plans out there for folks building their own RPC's, there are a lot of people who never heard of RPC's, here is a link to 1 forum that has plans for them. http://www.practicalmachinist.com/v...ry-phase-converter-designs-plans-101231/
Some people are a bit too "clever" for their own good, but that would be a good topic for a thread on it's own.
Off topic but since a lot of people have never heard of RPC's......