Patent ID: 8851942
Filing Date: 2014-10-07
Classification: B63H

Abstract:
1. A thrust generating apparatus which is positioned under water and configured to generate a thrust by ejecting water, comprising: a duct-shaped stator provided with a plurality of coils and a plurality of ring-shaped casings, the plurality of ring-shaped casings accommodating the plurality of coils respectively and being arranged in series in a water flow direction; and a plurality of ring-shaped rotors which are arranged radially inward relative to the stator, provided with magnets respectively corresponding to the plurality of coils and arranged in series in a rotational axis direction thereof, each of the rotors having a propeller vane protruding radially inward; wherein a radially inward tip end of the propeller vane forms a free end, the plurality of casings accommodating the plurality of coils respectively and the plurality of rotors provided with the magnets and the propeller vane constitute a plurality of motor units respectively; the plurality of motor units are coupled to each other in series in the water flow direction such that the plurality of motor units are individually dismountable; the stator has an annular coupling member which is formed on its outer peripheral surface with a concave portion, the annular coupling member being disposed between casings of the motor units; and the plurality of motor units are coupled to each other in series in the water flow direction by fastening both side walls of the concave portion to the casings of the motor units by bolts respectively.