Class / Patent application number | Description | Number of patent applications / Date published |
416036000 | Plural diverse condition responsive | 12 |
20090035133 | Delta Blade Propeller Apparatus - A method of using a delta shaped blade as an aircraft propeller, helicopter or autogiro rotor, or wind turbine propeller is presented. The invention combines the delta blade system with the use of torsion bars to achieve desirable control of blade twist. The invention uses blade twist to control the air loading on the craft; hence better control of maneuvering is achieved. The invention also optionally includes adjustable blade roots such that the sweep and aspect ratio of the delta blade is controllably variable. Compared to traditional propeller blade configurations, the invention boasts improved performance and enhanced aeroelastic properties. The invention is a far more efficient system providing economic advantages, higher speeds, and more durable designs. | 02-05-2009 |
20090123284 | High volume low speed fan - A high volume low speed (HVLS) fan provides improved air circulation and thermal control in a building by incorporating composite fan blades pivotable to both positive and negative pitch angles. The blades are molded of polymer material over a metal tube core for strength and ease of attachment to the fan hub, and have a symmetrical airfoil shape to produce an efficient bi-directional conical airflow. The fan includes a control unit providing manual and automated intelligent control over blade angle and rotational speed, as well as startup with approximately zero blade angle for more economical power consumption and less motor wear. The fan structure and mounting system allows the fan to be installed at an optimal height inside a variety of buildings to provide increased efficiency of air destratification and air mixing. An array of multiple HVLS fans with alternating directions of airflow can further increase efficiency of air movement. | 05-14-2009 |
20090220340 | VARIABLE TIP SPEED RATIO TRACKING CONTROL FOR WIND TURBINES - The present invention relates to a method of controlling the aerodynamic load of a wind turbine blade by controlling the tip speed ratio (TSR) and/or blade pitch setting of the wind turbine blade so as to optimize power production. A wind turbine blade undergoes an aero-elastic response including deflection and twist that is a function of the blade loading. The blade loading is dependent on the wind speed, TSR, and pitch setting. The aero-elastic response requires a different TSR and/or pitch to be selected throughout the power curve in order to maintain the optimum power production and to improve energy capture. | 09-03-2009 |
20090232653 | PADDLEWHEEL APPARATUS - A paddlewheel apparatus including a paddlewheel axle, first and second spaced apart annular wheel hubs locked in rotation with the axle, and a plurality of elongated tri-curved paddles cooperatively supported by the first and second wheel hubs and arranged around the circumference of the first and second annular wheel hubs and spaced apart from the paddlewheel axle. A method for creating current in a bio-pond raceway. | 09-17-2009 |
20100098540 | BLADE PITCH MANAGEMENT METHOD AND SYSTEM - A method for operating a wind turbine. The method includes providing a wind turbine having at least one blade having adjustable pitch angle that is adjusted according to an operational parameter schedule. A blade efficiency parameter is determined in response to a wind speed and a rotor speed. A minimum pitch angle is determined in response to the blade efficiency parameter and the pitch angle of the at least one blade in response to the blade efficiency parameter is maintained to an angle equal to or greater than the minimum pitch angle independent of the operational parameter schedule. A wind turbine plant and a method for servicing a wind turbine are also disclosed. | 04-22-2010 |
20100098541 | METHOD AND SYSTEM FOR OPERATING A WIND TURBINE GENERATOR - A method of operating a wind turbine generator having at least one wind turbine blade includes increasing a pitch angle of the at least one wind turbine blade as the at least one wind turbine blade rotates through a first range of blade azimuth values. Such increasing of the pitch angle reduces acoustic emissions generated by the wind turbine generator. The method also includes decreasing the pitch angle of the at least one wind turbine blade as the at least one wind turbine blade rotates through a second range of blade azimuth values. Such decreasing of the pitch angle increases electric power generated by the wind turbine generator. | 04-22-2010 |
20100135798 | WIND TURBINE NOISE CONTROLS - A method and system for providing noise control for a wind turbine system are disclosed. The method can include providing a wind turbine system comprising at least one blade operably mounted on the wind turbine and a controller, determining an external condition with at least one sensor, receiving a noise control signal related to the external condition, and adjusting an operating parameter in response to receiving the noise control signal related to the external condition. | 06-03-2010 |
20110142632 | Piecewise Variable Displacement power transmission - In one embodiment, a hydraulic circuit has an input shaft, at least one positive displacement hydraulic pump, a plurality of positive displacement hydraulic motors, and at least one fluid line operatively connecting the at least one positive displacement hydraulic pump to the positive displacement hydraulic motors. In operation, the at least one positive displacement hydraulic pump is placed in an operative condition. At least one of the positive displacement hydraulic motors is also placed in an operative condition. A flow rate of fluid in the fluid line is measured, and the remaining positive displacement hydraulic motors are switched between an operative condition and a bypass condition according to the measured flow rate of the fluid. | 06-16-2011 |
416037000 | Relative ambient condition sensing (e.g., temperature, density, wind force, etc.) | 4 |
20100021300 | VERTICAL AXIS WINDMILL - A vertical axis windmill is provided with a plurality of blades arranged at equidistant angular intervals with the vertical axis of rotation as the center in a plane perpendicular to a vertical axis of rotation, wherein the blade has a streamlined airfoil having a lift coefficient of 1.0 or more, comprising: an opening/closing member of which the front-end part is pivotally supported by the back side of the blade; and of which the rear-end part opens/closes with respect to the blade, and opening/closing control means for controlling the opening/closing action of the opening/closing member in response to the ratio of the rotational speed of the blade to a wind speed. | 01-28-2010 |
20100092291 | METHOD FOR CONTROLLING A WIND TUBINE USING A WIND FLOW MODEL - A control device is provided which is adapted for controlling at least one operational parameter of a wind turbine including a machine nacelle and a rotor having at least one rotor blade. The control device includes an input adapted for inputting a signal which is indicative of environmental data of the wind turbine, an evaluation unit adapted for generating at least one control signal on the basis of currently acquired environmental data and on the basis of previously acquired environmental data, and an output adapted to output the control signal adapted for adjusting the at least one operational parameter of the wind turbine. | 04-15-2010 |
20140017083 | WIND TURBINE STABILIZATION - System for stabilizing an offshore horizontal axis wind turbine having a tower, the system comprising sensors for generating signals representing detected movements of the tower, and gyroscopes. Each gyroscope has a spinning axis, an input axis and an output axis, and a flywheel rotatable about the spinning axis. The system further comprises an actuator for each gyroscope, said actuator being arranged with its related gyroscope in such a way that this actuator can apply a torque about the input axis of the gyroscope. The system also comprises a control unit for receiving the signals representing detected movements of the tower, and for providing the actuator with suitable control signals for said actuator to apply a torque about the related gyroscope input axis, said torque about the input axis producing a torque about the output axis of the same gyroscope that at least partly dampens the detected movements of the tower. | 01-16-2014 |
20160177922 | TRAILING EDGE JETS ON WIND TURBINE BLADE FOR NOISE REDUCTION | 06-23-2016 |