POWER GENERATOR FOR WELL EQUIPMENT Russian patent published in 2008 - IPC E21B47/00 

FIELD: mining; electrics.

SUBSTANCE: generator includes protection case and at least one mounting unit, electric connector, rotor installed on shaft with turbine, stator, exciter winding, and permanent magnets. Additional rotor and contact-free power transfer device in the form of primary and secondary windings are mounted on supports on the shaft. One of the windings is mounted on the turbine case connected to the main rotor, while the other one is mounted on the additional rotor. Stator and shaft are divided into upper and lower parts. Upper and lower shaft parts are connected. Exciter winding is mounted at the upper shaft part. Permanent magnets are installed inside the main rotor concentrically to the exciter winding. Primary winding of contact-free power transfer device is mounted at the lower shaft part, the secondary winding being mounted inside the lower stator part concentrically to the primary one. Primary exciter and windings are connected electrically to provide contact-free power transfer. Secondary winding is connected to the electric connection by electric wires passing through a hole in the lower stator part and led outside through a sealing plug.

EFFECT: reduced diametric dimensions and weight of generator.

2 cl, 1 dwg