WELL DRILLING MACHINE Russian patent published in 2012 - IPC E21B4/04 E21B7/00 H02K3/00 

FIELD: mining.

SUBSTANCE: machine includes a housing, coaxially located stator with coils, and rotor with excitation windings, which is installed inside stator. Excitation windings are located inside rotor and have four-pole coiling so that similar poles with "+" sign and with "-" sign are located along its axis and powered from DC supply through the collector, and coils of stator winding, which interact with magnetic field of excitation winding, envelope the rotor circle and are adjacent to two similar magnetic poles of excitation winding, thus forming minimum working air gap, and coils are separated from two other similar magnetic poles through the distance providing the weakening effect of fields; at that, in the housing on both sides of the rotor there installed is additional stator containing the coils laid as bipolar coiling into two non-magnetic rotors, which represent rotation bodies with side surface enveloping one fourth of the rotor circle, thus forming the working air gap.

EFFECT: enlarging the service life of drilling tool owing to improving the efficiency and increasing the control speed of operating conditions during drilling process.

3 dwg