PURPOSE: To miniaturize a power generating device, reduce the weight thereof, and improve high efficiency by arranging a turbine for driving a power genera tor inside a duct, and dispersingly-arranging the power generating devices which can generate power in both normal and reverse directions while varying the pitch of the turbine, on a plurality of magnetic levitation vehicle.

CONSTITUTION: In a ram air turbine power generating device 10, respective stators 14, 16 are arranged coaxially in front and rear directions held a turbine 12 in which pitching change is enabled in a duct 11, and also they are arranged symmetrically in front and rear directions. Namely, Current having a same amount is power-generated regardless of advance direction of a vehicle and flow-in directions A, B of air flow. The pitch change system of a turbine blade and the power generator are respectively mounted in respective stator housings 15, 17 and a turbine disk 13. The ram air turbine power generating devices 10 are dispersingly-arranged on a plurality of magnetic levitation vehicles. It is thus possible to miniaturize each power generating device and reduce the weight thereof, and also improve high efficiency, when demanded power generating amounts are equal to each other.