Patent ID: 9551186
Date: 2017-01-24
CPC Classifications: E21B,F16D,H02K

Claim:
1. A downhole turbine generator comprising: a turbine to transform hydraulic power of a first fluid medium passing through the turbine into rotational power of a rotating shaft a speed governor to reduce the rotational power of the rotating shaft by a variable amount depending on a speed of the rotating shaft, wherein the speed governor comprises weighted arms that shear a second fluid medium to a greater degree when the speed of the rotating shaft is higher and shear the second fluid medium to a lesser degree when the speed of the rotating shaft is lower, wherein the shearing of the second fluid medium generates a countervailing torque on the rotating shaft that reduces the rotational power of the rotating shaft; and an alternator configured to produce electrical power from the rotational power of the rotating shaft, wherein at least a part of each weighted arm of the speed governor is configured to shear the second fluid medium by extending farther away from the rotating shaft and further into the second fluid medium when the speed of the rotating shaft is higher.