Patent ID: 9598937
Date: 2017-03-21
CPC Classifications: E21B,F03B

Claim:
1. A downhole rotating magnetic field generator, comprising: a stator assembly, comprising a stationary cylindrical body and windings arranged in a first region of the body, and a rotor assembly, comprising a permanent magnet arranged radially outside of the windings and a turbine rotor arranged in a second region of the body which is axially adjacent to the first region, wherein the turbine rotor and the permanent magnet are fixedly connected with each other along an axial direction, and arranged on the body at both ends of the rotor assembly respectively through a first bearing and a second bearing, wherein a first external fluid pass is arranged on the periphery of the turbine rotor, and wherein a guiding stator is arranged on a third region of the body that is axially adjacent to the second region, a second external fluid passage is arranged on the periphery of the guiding stator, and a third internal fluid passage communicated with the first internal fluid passage is arranged inside the guiding stator.