This alternator adopts high performance material application technology, fractional slot stator winding technology, small size, light weight, greater output power compared with the same weight alternator, and when the rated speed is 6000r/min, it can steadily output electrical energy of 400HZ, 400V. It can match with micro turbojet engine built entirely into the generator set, which is the main or standby power in the advanced fields such as aerospace, military equipment and unmanned aerial vehicle.