Rotary Phase Converter (Create 3-phase power from a single phase source)

[Frank S]

Split phase is also the type of current here in the USA When talking about 220 v single phase
some mistakenly say there are 2 phases of 120v to get the 220 volt when actually it is only 1 phase split in the transformer to achieve 220v
Split phase is also used in rule Australia to get 480v