It says it's a controller FOR a car alternator, it sounds like the design is to control a 3-phase motor which provides rotary power to the alternator. If it was for using the alternator as a power source (for example driven by an engine) it would normally be brushed as mentioned but even if it really had three phase windings they would normally go to rectifiers not power transistors.
What are you actually building JamesBond001 ?
Brian.
(who designed some of the technical looking props in 'Skyfall')!