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| Number | Title | Issue Date |
| 8033788 | Method for determining fatigue load of a wind turbine and for fatigue load control, and wind turbines therefor A method of determining fatigue load of at least one operative wind turbine, comprising: providing a transfer function that associates an obtained at least one measurement value of a first sensor to an obtained at least one measurement value of a second sensor the a... | 10/11/2011 |
| 7762771 | Device for driving a first part of a wind energy turbine with respect to a second part of the wind energy turbine A device for driving a first part of a wind turbine with respect to a second part of the wind turbine includes a driving element for engagement with the first part. The device also includes a driving unit including a housing to be fixedly connected to the second par... | 07/27/2010 |
| 7385306 | wind power generator including blade arrangement The invention relates to a wind power current generator comprising a bearing, a tubular stator that carries a race of the bearing, a tubular rotor coaxial with the tubular stator that can rotate in relation to the stator, a hub connected to the rotor, and at least t... | 06/10/2008 |
| 7355294 | Method and system for wind turbine blade movement This document discusses, among other things, a wind turbine blade pitch system for moving the blades to control their pitch in the event of a power failure. The system includes at least one backup that has a non-electrical component that can pitch the blades in the ... | 04/08/2008 |
| 7351033 | Wind turbine load control method A method for limiting loads in a wind turbine by using measured loads or wind speed to increase the minimum pitch angle for extended periods. The minimum pitch angle will be allowed to relax down to the default when load excursions diminish. The method will allow tu... | 04/01/2008 |
| 7241193 | Variable marine jet propulsion A variable marine jet propulsion system incorporates a motor, a variable-pitch propeller pump in a spherical housing, a variable housing and a variable inlet duct, and a microcontroller. The pump, the nozzle and the inlet are controlled by the microcontroller, which... | 07/10/2007 |
| 7223071 | Device for providing assistance to the pilot of a rotorcraft in the event of engine failure The present invention provides a device enabling the collective pitch of the blades of the main rotor of a single-engined rotorcraft to be reduced automatically in the event of an engine failure. The device comprises an actuator which increases the collective pitch ... | 05/29/2007 |
| 7223073 | Boat propeller A boat propeller comprising a central hub member and an inner hub assembly that defines a longitudinally extending bore having an inner surface. The exterior surface of the central hub member is sized and shaped for disposition therein the bore of the inner hub asse... | 05/29/2007 |
| 7172392 | Passive speed and power regulation of a wind turbine A wind turbine with at least one blade having a pitch axis that is offset laterally so that the blade does not intersect with an axis of rotation of the wind turbine, and a center of mass and an aerodynamic center are offset from the pitch axis in the direction para... | 02/06/2007 |
| 7160083 | Method and apparatus for wind turbine rotor load control Vertical and horizontal wind shears, yaw misalignment and/or turbulence act together to produce asymmetric loading across a wind turbine rotor. The resultant load produces bending moments in the blades that are reacted through the hub and subsequently to the low-spe... | 01/09/2007 |
| 7121505 | Method of control for toy aircraft The invention described here offers a low-cost method of remote flight control suitable for use in toy airplanes and ornithopters (flapping-wing aircraft). To accomplish this, the aircraft is powered by a reversible electric motor. The propeller or flapping wing pro... | 10/17/2006 |
| 7118338 | Methods and apparatus for twist bend coupled (TCB) wind turbine blades A method for controlling a wind turbine having twist bend coupled rotor blades on a rotor mechanically coupled to a generator includes determining a speed of a rotor blade tip of the wind turbine, measuring a current twist distribution and current blade loading, and... | 10/10/2006 |
| 7118339 | Methods and apparatus for reduction of asymmetric rotor loads in wind turbines A method for reducing load and providing yaw alignment in a wind turbine includes measuring displacements or moments resulting from asymmetric loads on the wind turbine. These measured displacements or moments are used to determine a pitch for each rotor blade to re... | 10/10/2006 |
| 7101152 | Method for maximizing the energy output of a wind turbine A method is provided for controlling a wind turbine, and a wind turbine is provided with a control device for controlling a wind turbine. A method and a wind turbine are developed so that losses of yield, particularly as a result of variations in the conversion of t... | 09/05/2006 |
| 7100866 | Control system for a flying vehicle In one embodiment of the present invention there is described a vehicle having a propeller mechanism for propelling the vehicle in a horizontal direction. The vehicle includes a transmitter positioned on the bottom of the vehicle for transmitting a signal from the v... | 09/05/2006 |
| 7081689 | Control system for a wind power plant with hydrodynamic gear A wind power plant connectable to an electric grid is provided that has at least three control levels. A controller controls an angular position of the rotor blades and/or controls a setting of the reaction member of the hydrodynamic speed transformer and/or control... | 07/25/2006 |
| 7004724 | Method and apparatus for wind turbine rotor load control based on shaft radial displacement Vertical and horizontal wind shears, yaw misalignment and/or turbulence act together to produce asymmetric loading across a wind turbine rotor. The resultant load produces bending moments in the blades that are reacted through the hub and subsequently to the main sh... | 02/28/2006 |
| 6966754 | System and method for monitoring a wind turbine In one aspect, the present invention relates to a system for monitoring wind turbines, wherein image and acoustic monitoring, in particular, is performed. In order to further improve, for example, the maintenance, safety and efficiency of a wind turbine, it is desir... | 11/22/2005 |
| 6634224 | Method for the determination of the pressure in and/or of the through-flow through a pump In the method for the determination of the pressure (p) in and/or of the through-flow (Q) of a liquid through a pump having at least one magnetic bearing for the axial journaling of the pump rotor (1), axial forces act on the rotor (1) of the pump during ... | 10/21/2003 |
| 6468035 | Method and apparatus for controlling airplane engine An airplane engine control method and apparatus are provided which form an engine control system easy to operate, which set a reciprocating engine of an airplane in such an operating condition in a partial power mode as to maximize the efficiency of the a... | 10/22/2002 |
| 6158960 | Propeller hub with self-adjusting pitch mechanism A mechanism for automatically changing the pitch of propeller blades employing engine torque alone which increases with air speed. A powered hub mounts at least two blades and includes blade pitch changing elements automatically responsive to engine torqu... | 12/12/2000 |
| 6059528 | Electronic propeller control system An improved electronic hydraulic propeller control designed as a retro-fit kit for existing Hamilton Standard Division 54460 and 54H60 propeller controllers includes an apparatus for controlling the pitch angle of a propeller blade. The retro-fit kit incl... | 05/09/2000 |
| 6007298 | Optimum speed rotor A variable speed helicopter rotor system and method for operating such a system are provided which allow the helicopter rotor to be operated at an optimal angular velocity in revolutions per minute (RPM) minimizing the power required to turn the rotor and... | 12/28/1999 |
| 5810561 | Variable pitch propeller apparatus A variable pitch propeller apparatus for use with a motor is disclosed. The apparatus includes a housing having a plurality of blades mounted therein for rotation. Adjustable high pitch and low pitch stop rings are connected to the housing and a synchroni... | 09/22/1998 |
| 5494406 | Propeller for boat A propeller for a boat having a plurality of recesses and a plurality of land portions arranged circumferentially alternately around an outer periphery of a propeller boss which is fitted over and connected to a propeller shaft. A boss of each of propelle... | 02/27/1996 |
| 5465211 | Control system for propeller driven aircraft A control system is provided which prevents a powerful, propeller driven, jet training aircraft from requiring corrective action to throttling and gyroscopic effects when the student wishes to fly the aircraft in coordinated flight. The control system inc... | 11/07/1995 |
| 5413461 | Method and apparatus for controlling a propulsion engine output based on the net axial force on a propeller shaft A method and apparatus for controlling a propulsion engine output in a vessel, based on the net axial force on a propeller shaft in the vessel. The apparatus includes a regulating loop with a computer which continuously controls the delivery of fuel to th... | 05/09/1995 |
| 5326223 | Automatic variable pitch marine propeller with mechanical holding means There is provided a self-actuating variable pitch marine propeller which incorporates two or more blades, each independently rotatable, relative to the propeller hub, between a first lower and a second higher pitch. The blades are preferably mechanically ... | 07/05/1994 |
| 5240374 | Damped automatic variable pitch marine propeller There is provided a self-actuating variable pitch marine propeller which incorporates two or more blades, each independently rotatable, relative to the propeller hub, between a first lower and a second higher pitch. The blades are preferably mechanically ... | 08/31/1993 |
| 5129785 | Automatic variable discrete pitch marine propeller A self-actuating variable pitch marine propeller which incorporates two or more blades having cylindrical shafts which are rotatably connected to a central hub via cylindrical joints; the blades rotate about and translate radially, relative to the hub cen... | 07/14/1992 |
| 5032057 | Automatic variable pitch marine propeller There is provided a self-actuating, variable pitch propeller having a plurality of blades. All of the blades are automatically movable between a first, relatively lower pitch position and a second, relatively higher pitch position, substantially simultane... | 07/16/1991 |
| 5019006 | Aircraft engine propeller overspeed protection technical field An aircraft engine propeller autofeather system (4) has a feather solenoid (8) which is actuated by either a signal provided by an engine power loss detector (10) or a signal provided by an engine overspeed detector (12). The overspeed detector (12) detec... | 05/28/1991 |
| 4929153 | Self-actuating variable pitch marine propeller There is provided a self-actuating, variable pitch propeller having a plurality of blades. All of the blades are automatically movable between a first, relatively lower pitch position and a second, relatively higher pitch position, substantially simultane... | 05/29/1990 |
| 4759514 | Tail rotor yaw position control for a helicopter A yaw rate stabilizer for the tail rotor of a helicopter includes a tail rotor shaft rotatably supporting a tail rotor on which rotor blades are radially mounted to develop a lift force directed substantially horizontal and transverse to the longitudinal ... | 07/26/1988 |
| 4693671 | Reversible self-adjusting propeller device A self-adjusting propeller device having a control blade and a thrust blade connected together in nondiametrical relation and pivotally mounted on a hub for rotation about a hub axis. In response to a change in load on the device, the control blade pivots... | 09/15/1987 |
| 4690614 | Torque meter A torque meter is provided for use in conjunction with a layshaft having a forward and rear end and which is rotatably mounted in a housing. The layshaft is axially movable with respect to the housing between a forward and a retracted position while a gea... | 09/01/1987 |
| 4673822 | Wind electric generator Wind mill blades are mounted on spokes provided on a power shaft via springs, and thereby in an ordinary wind velocity the wind mill blades are adjusted into a prescribed angle, while in a storm they are made parallel to the direction of a wind, thus enab... | 06/16/1987 |
| 4656362 | Blade pitch angle control for large wind turbines A blade pitch angle control system for a wind turbine includes an improved control means (95) for providing a minimum pitch angle reference signal indicative of desired blade pitch at wind velocities less than rated. The control means includes means (35 a... | 04/07/1987 |
| 4648797 | Torque control system The dynamic instabilities in a system which controls prime mover output torque and angular velocity separately are avoided by deriving an accelerating torque signal in an output torque controller where it is added to a sensed torque signal, and the added ... | 03/10/1987 |
| 4641039 | Wind motors and aerogenerators An aerogenerator or wind motor comprises a variable pitch propeller rotor. It comprises compensation means (13) which are sensitive to the deceleration of the rotor to automatically exert on each blade (3), in case of deceleration of the rotor, a force wh... | 02/03/1987 |
