DOWNHOLE GENERATOR Russian patent published in 2012 - IPC E21B47/00 H02K5/12 H02K21/22 

FIELD: machine building.

SUBSTANCE: proposed generator comprises protective casing, connector assembly, at least one attachment assembly, rotor with hydraulic turbine and permanent magnets, and excitation winding. Said excitation winding is fixed inside said protective casing. Disk is attached to rotor. Tight inducting baffle is arranged between permanent magnets and excitation winding. Said baffle comprises inducting parts. Note here that generator comprises, at least, one compensator of pressure and thermal expansion with compensation piston. Piston is sealed relative to protective casing. Note also that chamber under compensation piston communicates via openings with chamber accommodating rotor while chamber above compensation piston communicates via holes with ambient medium. Note that compensation piston is spring loaded toward the side opposite hydraulic turbine to create surplus pressure in chamber accommodating rotor.

EFFECT: simplified design, higher reliability and power output, smaller sizes.

5 cl, 2 dwg