Patent ID: 8432054
Filing Date: 2013-04-30
Classification: F03D,F05B,Y02E

Abstract:
1. A wind turbine comprising: (a) a rotor; (b) a hydraulic pump coupled to the rotor, (c) a plurality of variable displacement hydraulic motors (d) at least one shaft to which the plurality of hydraulic motors are attached such that the hydraulic motors drive the at least one shaft (f) a generator coupled to the at least one shaft; (e) a closed loop hydraulic oil circuit connected to the hydraulic pump and the plurality of variable displacement hydraulic motors, the closed loop hydraulic oil circuit configured to carry pressurized oil from the hydraulic pump to the plurality of variable displacement hydraulic motors, and to return oil from the motors to the pump; and (f) a controller and associated valves in the closed loop hydraulic oil circuit which control the flow of oil in the closed loop system and displacement of each of the variable displacement hydraulic motors.