| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 416044000 | Impeller rotation speed responsive | 36 |
| 20080253889 | VERTICAL AXIS WIND TURBINES - A vertical axis wind turbine is described. The wind turbine can include a top ring, a middle ring and a lower ring, wherein a plurality of vertical airfoils are disposed between the rings. For example, three vertical airfoils can be attached between the upper ring and the middle ring. In addition, three more vertical airfoils can be attached between the lower ring and the middle ring. When wind contacts the vertically arranged airfoils the rings begin to spin. By connecting the rings to a center pole which spins an alternator, electricity can be generated from wind. | 10-16-2008 |
| 20090004005 | Method of Controlling the Pitch Velocity of a Wind Turbine Blade and Control System Therefore - A method of controlling at least one wind turbine blade during the stopping process of the rotor in a wind turbine system is disclosed. The method optimizes the control velocity of the process in response to one or more feedback values of the system and/or one or more feedback values from the surroundings of the system by altering the angular pitch velocity from 10°/sec during the initial stage of the stopping process to 5°/sec at the final stage of the stopping process. A control system and a wind turbine as well as use hereof are also disclosed. | 01-01-2009 |
| 20090081042 | METHOD OF CONTROLLING A WINDMILL, ESPECIALLY IN STAND-ALONE OPERATION AND A WINDMILL - A windmill comprising a rotor having a substantially horizontal axis of rotation ( | 03-26-2009 |
| 20090155074 | VERTICAL AXIS TURBINE - Turbine systems and apparatuses and methods for operating a turbine. The turbine has a shaft coupled to a generator and a segment and the segment has an asymmetric shaped wall. | 06-18-2009 |
| 20100135799 | Blade pitch control system - A method of operating a blade pitch change system of a gas turbine engine and its arrangement, the system comprising a blade, an actuator, a pressurised fluid system and a control system that regulates pressurised fluid to the actuator to control its position and thereby the blade's pitch; the blade pitch change system operates in a forward thrust mode and a reverse thrust mode, the control system comprises a main pitch control valve and a first reverse blade control valve through which the pressurised fluid passes. The method comprises the steps of a) continuously varying the main control valve to change the blade's pitch within the forward thrust mode at a first rotational rate, b) switching the first reverse blade control valve on to change the blades' pitch between the forward thrust mode and the reverse thrust mode at a second rotational rate that is greater than the first rotational rate. | 06-03-2010 |
| 20100135800 | SYSTEMS AND METHODS FOR DETERMINING THE ANGULAR POSITION OF A WIND TURBINE ROTOR - Certain embodiments of the invention may include systems and methods for determining an angular position of a wind turbine rotor. According to an exemplary embodiment of the invention, the method for determining an angular position of a wind turbine may include measuring tangential acceleration and radial acceleration of the rotor, measuring speed of the rotor, determining rotational tangential acceleration of the rotor based at least in part on the change of rotor speed over time, determining rotational radial acceleration based at least in part on the rotor speed, adjusting the measured tangential acceleration based at least in part on the determined rotational tangential acceleration, adjusting the measured radial acceleration based at least in part on the determined rotational radial acceleration, and determining an angular position of the rotor based at least on the adjusted tangential acceleration and the adjusted radial acceleration. | 06-03-2010 |
| 20100135801 | SYSTEMS AND METHODS FOR TESTING A WIND TURBINE PITCH CONTROL SYSTEM - Certain embodiments of the invention may include systems and methods for testing a wind turbine pitch control system. According to an exemplary embodiment of the invention, a method for testing a wind turbine pitch control system is provided. The method can include measuring tangential acceleration (At) of a wind turbine rotor, determining pitch angle of one or more turbine blades, and predicting torque applied to the one or more turbine blades based at least in part on the tangential acceleration (At) and the pitch angle. | 06-03-2010 |
| 20100303623 | WIND POWER DEVICE - A new reduced cost easily manufactured light weight wind turbine design combining the use of downwind passive yaw, large take off rim on the outside of the semi rigid sails, a new method of furling or changing sail AOA, new semi rigid sail design, and new tower design that allows passive yaw for high installation of wind wheels to gain energy from higher wind speeds. | 12-02-2010 |
| 20110033294 | BLADE PITCH REGULATING HUB AND SPEED REGULATING GEAR FOR WIND DRIVEN POWER GENERATORS - A blade pitch regulating hub ( | 02-10-2011 |
| 20110142633 | SYSTEMS AND METHODS FOR ASSEMBLING AN AIR DISTRIBUTION SYSTEM FOR USE IN A ROTOR BLADE OF A WIND TURBINE - A method of assembling an air distribution system for use in a rotor blade of a wind turbine. The rotor blade includes a sidewall at least partially defining a cavity extending from a blade root towards a blade tip. The method includes positioning at least a portion of a manifold within the cavity and coupling the manifold to the sidewall. The manifold extends from the blade root towards the blade tip and has a root end and an opposing tip end. A passage is defined from the root end to the tip end. A flow control device is coupled to the manifold root end and configured to channel air through the manifold. A bypass flow assembly is coupled to the manifold and configured to channel air through the air distribution system with the flow control device in a non-operating configuration. | 06-16-2011 |
| 20110255970 | Impeller for water pump - A present invention's object is to maintain a discharge performance by making a discharge flow rate constant in a low rotation region of an engine rotation speed and to reduce the discharge flow rate in a high rotation region. The present invention consists of a housing case, an impeller base provided with plural holes and plural elliptical elongated holes, a vane body provided with a rotary shaft on an inner peripheral side and a rocking shaft on an outer peripheral side, a plate cam in which an elongated groove is formed on an outer peripheral side of a disc portion and a single torsion spring. The spring and the plate cam are housed in the housing case and the impeller base. The rotary shaft is inserted rotatably into the holes, and the rocking shaft is movably inserted into the elliptical elongated holes and the elongated groove. | 10-20-2011 |
| 20120070286 | SPEED REGULATABLE ROTOR ASSEMBLY FOR WIND TURBINE - A rotor assembly for a wind turbine includes a hub adapted to be carried by a shaft of the wind turbine, a plurality of prop arms extending from the hub, a plurality of blades carried by the plurality of prop arms, and a rotor speed regulating mechanism adapted to alter a pitch of the plurality of blades responsive to varying wind speeds, thereby regulating the speed of the plurality of blades. | 03-22-2012 |
| 20120087793 | Multi purpose variable speed wind powered generator - A Multi Purpose Variable Speed Wind Powered Generator is configured to generate electrical power to all types of transportation and equipment in any wind condition. An on board trip computer monitors wind speed and calibrates settings. As wind speed increases in certain increments the wind speed activates the variable pitch modulation, which controls the blades angle of attack controlling rotor rpm. As the wind speed increases substantially wind speed activates the variable pitch modulation in the rotors decreasing pitch to keep rpm relative. At extreme wind speeds rotor pitch modulation adjusts almost to a neutral position to keep rotor rpm relative. Then the onboard trip computer responds in like sequence in union with wind monitor and rotors partially closing the grill diaphragm disk. This allows less airflow through the grill diaphragm disk to the rotors. Rotor modulation returns back to original pitch positioning and the processes are repeated as needed through every wind speed. Any transmission drive type can be used to engage propulsion forces from the electric motor. Rotor brakes are to slow or stop rotors movement at any time for any reason. The combustion engine is used at any time or any reason. | 04-12-2012 |
| 20120107119 | PARTIAL COARSE PITCH START RAM AIR TURBINE WITH ENHANCED SPRING SUPPORT - A Ram Air Turbine (RAT) is provided and includes a turbine hub having an end plate and a nose cone attached thereto at trailing and leading ends, respectively, a governor shaft, to which turbine blades are connected, which is coupled to the end plate and supported within the nose cone to be rotatable with the turbine blades about a central axis thereof and axially movable from a first position relative to the turbine hub to a second position relative to the turbine hub and a hub assembly operably coupled to the turbine hub, the governor shaft and the turbine blades whereby the hub assembly biases the governor shaft toward the first position at low rotational speeds such that the turbine blades assume a partial coarse pitch angle, and the second position at high rotational speeds such that the turbine blades assume a fine pitch angle. | 05-03-2012 |
| 20120114485 | RAM AIR TURBINE STARTUP - A ram air turbine (RAT) in which a cam follower is operably coupled to turbine blades such that a cam follower position determines turbine blade pitch. | 05-10-2012 |
| 20120141274 | WIND TURBINE ROTOR BLADE WITH PASSIVELY MODIFIED TRAILING EDGE COMPONENT - A wind turbine rotor blade includes a root portion and an airfoil portion extending from the root portion and defined by a leading edge and a trailing edge. The airfoil portion further includes a main foil section and a trailing edge section that is pivotally connected to the main foil section along a span-wise extending hinge line. A passive torsion element is coupled between the main foil section and the trailing edge section. The torsion element is biased to a neutral position wherein the trailing edge section is pivoted chord-wise to a low wind speed position relative to the main foil section. The trailing edge section is self-actuating from the low wind speed position to an increased wind speed position relative to the main foil section against as a function of the biasing force of the torsion element and wind speed over the airfoil section. | 06-07-2012 |
| 20120282094 | Wind Turbine Blade Tip Brake Apparatus and Method - The invention relates to a wind turbine blade tip and actuator assembly and method for controlling the speed of a wind turbine rotor blade. The invention consists of a moveable and turnable blade tip, an actuator assembly for turning the blade tip, control rods, cables and springs for controlling the blade tip, a magnet assembly for holding the blade tip in position and a hydraulic damping cylinder for controlling the rate at which the blade tip deploys. | 11-08-2012 |
| 20130064663 | MORPHING SEGMENTED WIND TURBINE AND RELATED METHOD - A downwind morphing rotor that exhibits bending loads that will be reduced by aligning the rotor blades with the composite forces. This reduces the net loads on the blades which therefore allow for a reduced blade mass for a given maximum stress. Also provided is a pre-aligned configuration rotor whereby the rotor geometry and orientation does not change with wind speed, and instead is fixed at a constant downwind deflection consistent with alignment at or near the rated wind speed conditions. Also provided is a twist morphing rotor where the airfoil-shapes around the spars twist relative to the wind due to aerodynamic forces so as to unload the rotors when there is a gust. This can help reduce unsteady stresses on the blade and therefore may allow for reduced blade mass and cost. The twist morphing rotor may be combined with either downwind morphing rotor or pre-alignment rotor. | 03-14-2013 |
| 20130230401 | FLYWEIGHT FOR RAM AIR TURBINE - A flyweight for use in a ram air turbine has a body with a circumferentially enlarged portion extending between flat sides spaced by an angle of between 45 degrees and 150 degrees. A pivot point is defined by a bore at a circumferentially intermediate point in the body, and in a relatively thin inner portion. The relatively thin inner portion extends beyond the pivot point to an end that will be radially inward when the flyweight is mounted in a ram air turbine. A governor, a ram air turbine and a method are also described. | 09-05-2013 |
| 20140308127 | Airfoil blades with self-alignment mechanisms for cross-flow turbines - This invention proposes a cross-flow turbine design with airfoil blades and self-alignment mechanisms. The airfoil blade self-alignment mechanisms rotate the airfoil blades at half of the turbine main shaft's speed and dynamically flip the blades after reaching the windward position to realign the airfoil blades or reset the attack angle of each airfoil blade so that the airfoil blade feathers the fluid flow at the windward position, generates maximum drag force at or near the leeward position, and produces both maximum lift and drag forces in between. | 10-16-2014 |
| 20140377066 | Portable Self-Inflating Airborne Wind Turbine System - A portable airborne wind-energy power conversion system, alone or in a modular array, wherein each portable airborne system comprises tethered airship, hydrogen generation system, hydrogen recovery system, and control system, wherein the tethered airship comprises a self-inflating horizontal-axis wind turbine rotor, an electrical generator, a self-inflating aerodynamic shroud surrounding the wind turbine rotor, and stabilizing fins, wherein the aerodynamic shroud has the geometry of a wind concentrator and diffuser in fluid communication with the wind turbine rotor that is located in the narrowest section of the shroud between the concentrator and diffuser sections of said shroud, wherein the airship is additionally self-deflating and the entire system is collapsible into a volume less than one tenth of its original size, so that the portable airborne system can be easily transported, stored, or relocated, wherein the system can continue to produce usable power, even during the process of self-deflation. | 12-25-2014 |
| 20150064006 | RAM AIR TURBINE STARTUP - A ram air turbine (RAT) in which a cam follower is operably coupled to turbine blades such that a cam follower position determines turbine blade pitch. | 03-05-2015 |
| 20160131108 | AIRFLOW GENERATION DEVICE AND WIND POWER GENERATION SYSTEM - There is provided an airflow generation device and the like capable of suppressing an increase in a number of poles of a slip ring, and effectively preventing a malfunction from occurring due to a generation of noise caused by the slip ring. An airflow generation device of an embodiment has a main body, a rotation speed detecting unit, and a voltage application unit. The main body has a first electrode and a second electrode provided to a base formed of a dielectric, and is disposed on a rotary body. The rotation speed detecting unit detects a rotation speed of the rotary body. The voltage application unit generates an airflow by applying a voltage between the first electrode and the second electrode based on the rotation speed detected in the rotation speed detecting unit. Here, the voltage application unit and the rotation speed detecting unit are disposed in the rotary body. | 05-12-2016 |
| 416046000 | Including pitch lock or adjustable stop | 7 |
| 20080273976 | Variable rotor blade for gas turbine engine - A variable rotor blade mechanism for use in a gas turbine engine comprises a blade rotor, a blade, a harmonic drive system, a stepper motor and a bracket. The blade rotor rotates absolutely about an axial engine centerline during operation of the gas turbine engine. The blade extends radially from the blade rotor and is configured to be adjustable by rotation about a radial axis. The harmonic drive system is mounted to the blade rotor and connected to the blade to rotate the blade about the radial axis. The stepper motor drives the harmonic drive with relative rotational input with respect to the absolute rotation of the blade rotor. The bracket is disposed about the engine centerline and supports the stepper motor stationary with respect to the rotation of blade rotor such that the relative rotational input to the stepper motor is generated. | 11-06-2008 |
| 20090180876 | Electrohydraulic propeller governor - Proposed is a hydraulically controlled variable pitch propeller system for air, land or water craft, comprising an engine, an engine controller, a rotating propeller featuring at least two propeller blades ( | 07-16-2009 |
| 20100296927 | EOLIC TURBINE AND ADJUSTING DEVICE OF THE BLADE PITCH - An eolic turbine is disclosed, comprising: a hub ( | 11-25-2010 |
| 20110142634 | OVERSPEED PROTECTION SYSTEM AND METHOD - An overspeed protection system for a wind turbine having a hub and at least one rotor blade mounted to the hub includes a rotation sensor adapted for measuring a rotor speed of said wind turbine; a comparator connected to the rotation sensor and adapted for comparing the measured rotor speed with a predetermined threshold value of the rotor speed wherein the comparator outputs a signal indicative of the comparison; and an auxiliary pitch drive controller connected to the comparator and adapted to receive the signal indicative of the comparison, the auxiliary pitch drive controller being further adapted for controlling a pitch drive unit of the wind turbine independently of a main turbine controller and, if the threshold value is exceeded, to adjust a pitch angle of the rotor blade of the wind turbine so that aerodynamic braking of the wind turbine is effected. | 06-16-2011 |
| 20120014793 | WIND TURBINE WITH VARIABLE BLADE PITCH FOR WIND POWER ELECTRICAL GENERATOR - The present patent application provides a wind turbine with variable blade pitch. The wind turbine with variable blade pitch includes a turbine shell coaxially disposed at a turbine axis; and at least three evenly distributed blade handle bases fixedly disposed at the outer circumference of the turbine shell. A blade handle axis is coaxially configured on each blade handle base. A blade is fixedly disposed on each blade handle axis. A centrifugal blade pitch changing unit is disposed on the turbine shell and configured to adjust the rotation speed of the wind turbine. When the rotating speed of the wind turbine exceeds the rated rotating speed, it is regulated by the centrifugal blade pitch changing unit, so as to avoid the rotating speed of the wind turbine to be greatly increased due to the wind speed rise and make the wind turbine run stably at the rated rotating speed. | 01-19-2012 |
| 20130149149 | ROTOCRAFT ROTOR INCLUDING A FLAPPING ABUTMENT MECHANISM FOR BLADES HINGED ON A HUB OF THE ROTOR - An abutment mechanism for limiting the flapping of the blades of a rotor ( | 06-13-2013 |
| 20130287569 | TURBINE LOCK PLUNGER FOR RAM AIR TURBINE ASSEMBLY - A ram air turbine assembly includes a governor shaft rotatable about an axis and a stop shaft coupled for rotation with the governor shaft. A rotatable housing portion surrounds at least a portion of the stop shaft. A lock plunger extends through an opening in the rotatable housing portion to prevent rotation of the rotatable housing portion and minimize vibration impact loading when stowed. | 10-31-2013 |
| 416047000 | Control by means of separate motor | 3 |
| 20090185902 | Device for Controlling the Blades of a Wind Turbine - The invention relates to a device for controlling the blades of a wind turbine. According to the invention, each blade ( | 07-23-2009 |
| 20110171027 | TORQUE COMPENSATION FOR PROPELLER PITCH CHANGE MECHANISM - A propeller assembly has a plurality of propeller blades, and a pitch change mechanism including at least one motor. A drive input drives the plurality of propeller blades to rotate about a central drive axis. The pitch change mechanism is operable upon driving of the motor to move the propeller blades relative to the drive input. The drive input includes a drive input gear transmission to change a pitch angle of the blades when the blades are moved relative to the drive input by the pitch change mechanism. Further, a method of operating a propeller assembly to change a pitch angle is disclosed and claimed. | 07-14-2011 |
| 20120328436 | ELECTROMECHANICAL ACTUATOR DRIVEN GOVERNOR FOR RAM AIR TURBINE - A ram air turbine governor includes a hub carrying multiple turbine blades. A sensor is configured to detect a parameter. A counterweight is coupled to at least one turbine blade and is configured to provide an input to the turbine blade in response to a centrifugal force to move the turbine blade from a first pitch position to a second pitch position. An electromechanical actuator is operatively coupled to the counterweight. A controller is in communication with the mechanical actuator and the sensor. The controller is configured to command the electromechanical actuator and move the turbine blade from the second pitch position to a third pitch position in response to the detected parameter. | 12-27-2012 |
| 416051000 | Centrifugal mass moved along guided or lineal path | 2 |
| 20080260532 | Vertical Axis Turbine - A turbine with a vertical axis of rotation is described, with particular reference to a wind powered embodiment. It is advantageous to ensure that a turbine rotates at a substantially constant speed despite variations in the driving force and to ensure that the turbine is not damaged when the driving force is excessive. The turbine includes a plurality of turbine blades arranged about a central axis, with each turbine blade being pivotally mounted towards its outer periphery about an axis substantially parallel to the central axis. A biasing element biases the inner periphery of the turbine blades towards the central axis. As the speed of rotation of the turbine increases, the blades swing out of the wind and there center of gravity moves away from the central axis, tending to slow the speed of rotation. | 10-23-2008 |
| 20090317251 | Stabilizing Apparatus For Vertical Axis Wind Turbine - A stabilizing apparatus is provided, applicable to all kinds of vertical axis wind turbine (VAWT), including at least two rolling units, at least two guiding units and at least an engaging unit. The engaging unit is engaged to the guiding units to fix the relative position among the guiding units. The guiding units are symmetrically extending from the center area of the apparatus to the outer brink of the circumference of the apparatus with a housing space formed inside each guiding unit. The rolling units are uniformly housed inside the housing space of the guiding units. The inner wall of the bottom of the housing space inside the guiding unit forms a guiding track. The guiding track also extends from the center of the apparatus towards to the brink of the circumference of the apparatus. The straight line connecting the starting and the ending points of the guiding track forms an angle of 0-45° to the horizon surface. When the present invention is installed with the wind turbine rotor of a VAWT and rotates with the wind turbine rotor synchronously, the rolling units move outward along the guiding tracks because of the centripetal force; hence, the rotational inertia of rotor system increases as the rotor rotation speed is increased by wind so that the wind turbine rotor can start with a lower starting torque and spin more stably. | 12-24-2009 |
| 416052000 | Centrifugal mass coaxial with impeller | 1 |
| 20120014794 | AUTOMATIC PITCH CONTROL FOR HORIZONTAL AXIS WIND TURBINES - A self setting and self powered system for adjusting the blade angles of a wind turbine such that they have a high angle of attack when parked to promote early start up, move to their ideal setting angle for normal running, can respond to gusts and lulls with appropriate changes, and feathers the blades to limit the rpm and reduce loads in storm conditions. The system balances the thrust loads on the turbine against centripetal forces generated by masses reacting to the rpm, increasing the blade pitch with gusts to increase torque and hence rotational acceleration and reducing blade pitch in lulls to conserve rotational momentum, and uses springs to establish the starting position and the rpm limit appropriate for the generator mechanism. | 01-19-2012 |
