I don't think that's the concept used. It's more likely to be a salient pole synchronous machine with the field winding supplied by an rotating transformer and

I don't think that's the concept used. It's more likely to be a salient pole synchronous machine with the field winding supplied by an rotating transformer and diodes (the second illustration in the linked article seems to corroborate that). This concept has been proposed at least since the 1960s, to the best of my knowledge, but is only viable with modern power semiconductors. The hyped-up style is typical of american "technical" articles about electrical machinery.