SUBMERSIBLE MOTOR Russian patent published in 2003 - IPC

FIELD: submersible pump drives. SUBSTANCE: motor designed for operation in curved boreholes and at high depths has shaft-mounted wound stator core and squirrel-cage rotor made of at least one squirrel-cage stack and radial bearings, all mounted in stator frame. Stator has six-phase winding for connection to three-phase mains. Frame has end plate with valve and head with current lead. Motor also has coupling in the form of twin articulated joint with twelve degrees of freedom disposed in head coaxially with motor shaft, and also sliding journal bearing mounted in lower part of shaft which is movable in plane perpendicular to shaft thereby ensuring its self-alignment and abutting against thrust journal and thrust bearing at any positions of shaft. EFFECT: enlarged functional capabilities. 2 cl, 1 dwg