Patent ID: 7418820
Filing Date: 2008-09-02
Classification: F03D,F04B,F05B,F16H,Y02E

Abstract:
1. A wind turbine comprising: (a) a rotor; (b) a generator; (c) a low-speed positive displacement hydraulic motor driven by the rotor to act as a hydraulic pump; (d) a variable displacement hydraulic transmission which is connected to and drives the generator, wherein the transmission accepts the entire output of the motor acting as a pump; (e) a closed loop hydraulic oil circuit for carrying pressurized oil to the transmission from the motor acting as a pump and to return oil to the motor acting as a pump from the transmission wherein the closed loop circuit directly connects the motor acting as a pump output and the transmission input without diversion; and (f) means for varying the displacement of the transmission in response to variations in pressure within the oil circuit.