In a first aspect, a yaw system for rotating a nacelle with respect to a tower is provided. The yaw system comprises a gliding yaw bearing, an annular gear and a plurality of yaw drives, a braking disk and one or more braking disk for braking the rotation of the nacelle. In a further aspect, a tower adapter for a wind turbine is provided. The tower adapter comprises a first bearing component of a gliding yaw bearing and braking disk to brake the rotation of the nacelle with respect to the tower adapter. In yet a further aspect, a wind turbine comprising such a yaw system and/or such a tower adapter is provided.

A blade pitch arrangement of a wind turbine is provided having a number of blade shafts extending radially outward from a hub and a rotor blade mounted around each blade shaft, which blade pitch arrangement includes a toothed ring arranged at the root end of each rotor blade; and a pitch drive unit for each rotor blade, having a driver body and a pinion realized to engage with the toothed ring of a rotor blade; wherein a pitch drive unit is arranged relative to its corresponding rotor blade such that the pinion is positioned closest to the hub, and the driver body extends in a direction radially outward from the hub. A wind turbine is also described.

A system of harnessing energy with a non-buoyant object and a buoyant object that captures the potential energy of a weight as it falls through a fluid such as water and then attaches a float to the weight to return it to the origin via the differential in densities thereof. The exemplary fluid used is water and that of oceans or lakes. The floats are deposited near the bottom of the ocean or lake by way of a tube or other passageway.

A system for capturing fluid energy has a blade shaft coupled to a gear assembly and a blade assembly. The blade assembly has a rod arm and a blade having a front surface and a blade plane, the blade fixedly coupled substantially normal to the rod arm. A limiter coupling has a limiter coupling axis and is coupled to the blade such that the limiter coupling axis is substantially parallel to the front surface and perpendicular to the rod arm. A horizontal limiter restricts the limiter coupling to a range of motion substantially along a first movement axis perpendicular to the limiter coupling axis and substantially perpendicular to the blade shaft. The blade assembly interacts with a fluid flow to transmit fluid energy from the fluid flow to the blade shaft to impart rotational energy to the gear assembly.

A device for the accumulation of elastic energy and converting it into electrical energy, which provides the highest possible efficiency of energy storage and conversion. The device uses a high load capacity and efficiency of the roller screw mechanism and the ability of disc springs to store and release energy with the greatest possible specific elastic deformation. The device is equipped with a brake, which makes it possible to maintain the accumulation of elastic energy for a long time. In the state of energy storage, the motor-generator works as a motor, and to convert the stored elastic energy into electrical energy, it works as a generator.

A system with orbiting axis for converting energy from a fluid includes an inner transmission shaft and an output transmission shaft; a sectorial blade configured to exchange energy with the fluid and connected to the inner transmission shaft by a support element pivotable such that the blade is configured to rotate around an axis of the inner transmission shaft; a for synchronization and transmission of rotation-oscillation movement of the blade and including the inner transmission shaft and the output transmission shaft. The support element is hinged to the inner transmission shaft by a first rotator rigidly connected, at a first extremity, with the support element by a pin and, at a second extremity, to one of the transmission shafts, each blade being configured to perform the rotation-oscillation movement integrally with the support element and always oriented in the direction of the fluid.

A vertical axis wind turbine includes two or more cells arranged one above the other along a vertical machine axis, wherein each of the cells includes a plurality of vertical blades which are arranged within the cell distributed on a concentric circle about the machine axis and which are connected so as to be able to move together on this circle and which are rotationally fixed with a main shaft, and wherein the blades in the cell are each individually mounted so as to be able to rotate about a vertical axis of rotation which in particular runs internally through them.

The present invention describes a floating yawing spar buoy current/tidal turbine. The spar includes a spreader above the rotor(s) with the spreader tips connected to fore and aft cable yokes that transition to opposing mooring lines connected to anchors on the seabed. The spreader comprises a yaw motor, which drives gears that engage with a ring gear fixed to the outer perimeter of the spar.

A wind-turbine rotor blade, comprising a blade root and a blade tip, a flange arranged on the blade root side for fastening the rotor blade to a rotor hub of a wind turbine, and a pitch bearing for adjusting the angle of attack of the rotor blade. The rotor blade has a non-pitched carrier, on which the flange is embodied, wherein the pitch bearing is fastened to the carrier and is spaced apart from the flange toward the blade tip.

An energy storage method and system includes a collapsible bladder that is filled with water at depth. The bladder may be lowered to additional depths to increase the pressure experienced within the bladder and to increase the stored energy. In a preferred embodiment, over produced electricity is used to pump water into a bladder. During periods of high electricity demand, pressurized water within the bladder is directed through a conduit to turn turbines of generators and produce electricity. Two large all-thread screws are attached to the bladder and anchored to the seafloor or at or near a bottom of a body of water. Associated threaded mechanisms are connected to the exterior of the bladder such that when the all-thread screws are turned, the bladder is raised and lowered within the water to vary the internal pressure. In this manner, the bladder is lowered or anchored deeper as needed to produce additional pressure. Energy needed to lower the bladder may be recovered during the deflation process or in high excess energy production times where demand is low. The bladder may be used to store fresh water and reused as necessary. Controlled operation of the procedure may be performed through use of PLCs and coupled to sensors and actuators.