A system for generating alternating current of selected voltage at a target frequency includes a plurality of A.C. generators, at least one of which has a rotatably mounted stator. A prime mover drives a power input shaft at speeds extending through a wide range and the shaft is connected to the first...http://www.google.fr/patents/US4087698?utm_source=gb-gplus-shareBrevet US4087698 - Alternating current power generating system
