A gravity driven hydroelectric system, whereby hydroelectric power is developed from potential energy of dammed water driving a water turbine assembly. The hydroelectric power extracted from the water depends on volume and on a difference in height between a source and an outflow of the water. A penstock delivers the water to the water turbine assembly. The penstock has a housing secured by frame assemblies to a structure. The housing has electromagnetic coils that produce electricity from a rotation of turbine blades having magnets.

The present disclosure discloses a horizontal-axis ocean current power generation device for an underwater vehicle. The power generation device is disposed in a groove of a rotary body of the underwater vehicle, and includes an undercarriage unit, a yawing unit, and a power generation unit. The undercarriage unit can realize elevation and descent of the entire power generation device, and the power generation unit is capable of realizing arbitrary rotation within 360° in a horizontal plane through the yawing unit. The power generation device can actively yaw based on change of an ocean current direction to perform an incident flowing function. The power generation unit respectively drives an outer shaft and an inner shaft to rotate through a front blade and a rear blade that rotate in opposite directions, so as to drive inner and outer rotors of a motor, thereby cutting magnetic induction to generate electric power.

In accordance with various embodiments of the present disclosure, a hydroelectric turbine includes a stator and a rotor disposed radially outward of the stator. The rotor is rotatable around the stator about an axis of rotation. The turbine also includes a generator disposed along the axis of rotation. The generator is stationary and coupled to the stator. The turbine additionally includes a gear disposed along the axis of rotation. The gear is operably coupled to the generator. The turbine further includes a plurality of blades operably coupled to and extending radially outwardly from the gear. The plurality of blades is fixed to the rotor to rotate the rotor in response to fluid flow interacting with the blades.

The present disclosure discloses a horizontal-axis ocean current power generation device for an underwater vehicle. The power generation device is disposed in a groove of a rotary body of the underwater vehicle, and includes an undercarriage unit, a yawing unit, and a power generation unit. The undercarriage unit can realize elevation and descent of the entire power generation device, and the power generation unit is capable of realizing arbitrary rotation within 360° in a horizontal plane through the yawing unit. The power generation device can actively yaw based on change of an ocean current direction to perform an incident flowing function. The power generation unit respectively drives an outer shaft and an inner shaft to rotate through a front blade and a rear blade that rotate in opposite directions, so as to drive inner and outer rotors of a motor, thereby cutting magnetic induction to generate electric power.

In accordance with various embodiments of the present disclosure, a hydroelectric turbine includes a stator and a rotor disposed radially outward of the stator. The rotor is rotatable around the stator about an axis of rotation. The turbine also includes a generator disposed along the axis of rotation. The generator is stationary and coupled to the stator. The turbine additionally includes a gear disposed along the axis of rotation. The gear is operably coupled to the generator. The turbine further includes a plurality of blades operably coupled to and extending radially outwardly from the gear. The plurality of blades is fixed to the rotor to rotate the rotor in response to fluid flow interacting with the blades.

A wind wheel includes a main shaft, a wind plant hub, and a plurality of blades. Each blade includes a short elbow part with axial and sleeve segments connected at 30-45 angle and a long wing-shaped part, connected to the sleeve segment with an end shaft and by support devices with bearings. The short elbow part is made of steel, and is a distance of 1.5-5 meters or 0.20-1.5 meters from a connection thereof to the hub, and at a juncture of the axial and sleeve segments has a 10-80 elbow bend opposite a direction of rotation of the wind wheel. The sleeve segment of the short elbow part has a cylindrical skeleton with three double support rings and is connected to the wing-shaped part of the blade, a root end of which is supplied with a hollow steel shaft with three removable protuberances with the bearings.

The invention provides a lightning receptor arrangement (11, 12) for a wind turbine blade (10) comprising at least a self-threading screw (21) having a head (23) and a threaded shaft (25) as a the external metallic receptor element for receiving a lightning strike in one side of the wind turbine blade (10) and an internal element comprising an electrically conductive block (20) configured with at least an unthreaded hole (41) for cooperating with said threaded shaft (25) and connected to a down conductor (18) of a grounding arrangement. The internal element is joined to at least a shell (17) of the wind turbine blade (10) with an adhesive force capable of withstanding the torque applied to the self-threading screw (21) for threading it to the unthreaded hole (41).

A wind wheel includes a main shaft, a wind plant hub, and a plurality of blades. Each blade includes a short elbow part with axial and sleeve segments connected at 30-45 angle and a long wing-shaped part, connected to the sleeve segment with an end shaft and by support devices with bearings. The short elbow part is made of steel, and is a distance of 1.5-5 meters or 0.20-1.5 meters from a connection thereof to the hub, and at a juncture of the axial and sleeve segments has a 10-80 elbow bend opposite a direction of rotation of the wind wheel. The sleeve segment of the short elbow part has a cylindrical skeleton with three double support rings and is connected to the wing-shaped part of the blade, a root end of which is supplied with a hollow steel shaft with three removable protuberances with the bearings.

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 spar cap for a rotor blade of a wind turbine may generally include an assembly of pre-cured laminate plates stacked on one top of the other, with the assembly including an outermost pre-cured plate, an innermost pre-cured plate positioned opposite the outermost pre-cured plate and a plurality of intermediate pre-cured plates stacked directly between the outermost and innermost pre-cured plates. The outermost pre-cured plate may be configured to be positioned adjacent to an inner surface of a body shell of the rotor blade. In addition, the outermost pre-cured plate may define a plate thickness that differs from a plate thickness defined by the innermost pre-cured plate by at least 50%.