An AC power generating system includes an array of permanent magnet alternators. The stator windings of these alternators are electrically connected in series and the total output voltage of the alternator array is regulated by adjusting the relative angular positions of the stators to control the phase...http://www.google.ca/patents/US4691119?utm_source=gb-gplus-sharePatent US4691119 - Permanent magnet alternator power generation system
