MULTI-PHASE POWER GENERATOR OF DOWNHOLE EQUIPMENT Russian patent published in 2011 - IPC E21B47/00 

FIELD: electricity.

SUBSTANCE: generator consists of protective housing (PH), at least, one attachment point, solid axis, rotor connected to hydraulic turbine, permanent magnets (PM), exciting winding and electric connector (EC). Note that PM are installed at solid axis, grouped by generator phase quantity and shifted in relation to each other by 360°/p, where p-the quantity of phases. Exciting windings are also grouped by phase quantity and installed inside PH. Rotor consists of alternating magnet-penetrable and magnet non-penetrable elements and is installed between solid axis and exciting winding. Hydraulic turbine is installed in generator front part. There are two attachment points at PH that provide passing of drilling mud. Note that inside the first attachment point there installed are straightener vanes that straighten the flow of drilling mud after hydraulic turbine. The wires from winding to EC go through the holes made in PH. The inner cavity of PH is filled with lubricating fluid. There is a drain hole in the bottom part of PH that is closed by plug. The hole for lubricating fluid filling in is made at the top and EC is at the bottom.

EFFECT: increase of generator capacity and reliability at decrease of its diametric sizes and weight.

7 cl, 7 dwg