Submersible motor apparatus

摘要

A submersible motor apparatus having a plurality of unit motors connected in series through their shafts in the direction of application of gravity. The shaft of an uppermost unit motor constituting an output shaft of the motor apparatus to which a pump is to be connected. The submersible motor apparatus has an upper thrust bearing disposed above the level of the stator core of the uppermost unit motor and adapted to bear the axial load applied to the shaft of the uppermost unit motor, and a lower thrust bearing disposed below the level of the stator core of a lowermost unit motor and adapted to bear the axial load exerted to the shaft of the lowermost unit motor. The shafts of the unit motors are connected in series by splined couplings.