BIROTATORY BOREHOLE ELECTRIC GENERATOR Russian patent published in 2008 - IPC E21B47/22 H02K5/12 

FIELD: electrical engineering.

SUBSTANCE: device is related to the sphere of electric engineering and is intended for use in power supply electric generators of borehole equipment and transmitting devices of bottomhole telemetric system. The substance of invention consists in the following. Birotatory borehole electric generator consists of fixation unit, rotor with working wheel of turbine, which is installed in the front part, and with set of permanent magnets, installed in it, stator with excitation winding. At that, according to this invention, in the back part of electric generator on additional rotor there is second working wheel of hydraulic turbine, on top of which there is the second set of permanent magnets, sets of permanent magnets are installed on rotor cones, and excitation winding is installed in the conical partition of stator between two rotor cones with sets of permanent magnets.

EFFECT: increases power of electric generator with simultaneous reduction of its weight and dimensions.

5 cl, 2 dwg