To attain miniaturization and lightening of weight, and easily perform supply/discharge of water by forward/reverse rotation operating of a motor.
In a stator assembly 1, a rotor assembly 2 is rotatably stored, the stator assembly has a stator core 12 provided with an excitation winding in each magnetic pole, the rotor assembly has a rotor core 21 of 4-pole salient structure, the rotor core is formed with a recessed part 28 communicating with an axial direction of a rotor shaft 23 in a peripheral part, by this recessed part, an axial flow blade is formed. The rotor core is rotatably supported by a sleeve bearing 22 fixing the rotor shaft in a support member 24. In non-core part of the rotor assembly, a current plate 32 is arranged. Liquid is fed from a liquid inflow guide 35 to a liquid outflow guide 36 through the current plate, rotor core and the current plate.
TANABE YOSHIFUMI
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