A vertical axis wind turbine rotor with a base having a rotational centre, a top surface, a top surface edge, and a plurality of top plates disposed radially around the rotational centre. The rotational centre defines an axis of rotation substantially orthogonal to the top surface. The top surface extends radially from the rotational centre to the top surface edge. Each of the top plates has a leading edge coupled to the base. Each top plate is passively transitionable between a first position above at a first height, and a second position above the top surface at second height. The rotor may also have a bottom surface with a plurality of bottom plates coupled thereto and disposed radially around the rotational centre. The bottom plates can be passively transitionable between a raised position and lowered position.

A vertical axis windmill comprises three or more frames rotatable in unison about a substantially vertical axis and a plurality of airfoils hingedly affixed to each frame. Each airfoil is able to swing away from its respective frame in a first direction from a closed position to an open position and not able to swing away from its respective frame in a second direction from the closed position.

Disclosed is a power generation device (1), comprising a shaft column (11) and at least two blade units (12-17), wherein the blade units (12-17) are sheathed onto the shaft column (11) and capable of rotating around the shaft column (11), the adjacent blade units rotate in opposite rotational directions, each blade unit (12-17) has a plurality of arm portions (121-171) and a plurality of movable blades (122-172), the arm portions (121-171) extend radially outwardly from the shaft column (11), each of the movable blades is connected to one side of the corresponding arm portion and, after passing through a first radial center line (19) of the shaft column (11), expands gradually, and after being expanded, does not interfere with the adjacent blade unit, the first radial center line (19) is parallel to a fluid flow direction, and each of the movable blades is gradually closed after it rotates through a rotation angle. The power generation device (1) can maximize the use of energy in the fluid so as to improve power generation efficiency.

A wind turbine device includes a rotatable seat, and a blade assembly including a rotary shaft having a fulcrum portion rotatably connected to the rotatable seat, and two mounting portions extending oppositely and respectively from two opposite ends of the fulcrum portion. At least two blade units are respectively connected to the mounting portions. Each blade unit includes a plurality of angularly spaced-apart blade modules each including a grid frame and a plurality of blades connected to the grid frame. The grid frame includes at least two airfoil-shaped first rods extending along an axial direction of the rotary shaft and spaced apart from each other along a radial direction of the rotary shaft.

A system for generating electric energy from wind or hydraulic energy includes a turbine, and an electric energy generating device to which the turbine is connected through a shaft along a first axis. The turbine includes at least one blade, configured to perform a first rotary movement with respect to the first axis, and a second rotary movement with respect to a second axis, coinciding with the axis of the blade itself. This provides a system with structural features allowing high efficiency, facilitating installation in various environmental contexts, without risk of damage for the respective operational and structural integrity, at the same time. Additionally, the system has an essentially reduced environmental impact, as well as a low noise level so that it can be installed in an urban context or in any case close to built-up areas, i.e. near houses or buildings.

This disclosure provides a vertical-axis windmill including a rotating vertical shaft and at least one vane assembly mounted to the rotating vertical shaft. The vertical-axis windmill rotates around a vertical axis when wind impinges upon the vane assembly. During rotation, a planar sail of the vane assembly moves along an oscillatory arc of about 90°, with the planar sail assuming each of a vertical orientation and a horizontal orientation once during each 360° rotation of the vertical shaft. As described below, this configuration advantageously allows the windmill to be self-starting and suited for operation at low wind-speed.

A fluid turbine apparatus includes a fixed structure and a rotating structure supported by the fixed structure. The rotating structure includes a central shaft, and at least two wings connected to the central shaft. Each of the wings includes a wing frame, at least one door and a respective at least one door stopper. Each of the doors pivots relative to the respective wing frame between closed and open positions. In use, the door located at one side of the central shaft facing a flow of fluid is in the closed position with fluid force transferred to the door, while the door located at the opposite side of the shaft is in the open position with fluid passing through the respective wing frame. The fluid force creates a torque that rotates the central shaft. Apparatuses can extract power from wind or water current.

A vertical axis wind turbine rotor with a base having a rotational centre, a top surface, a top surface edge, and a plurality of top plates disposed radially around the rotational centre. The rotational centre defines an axis of rotation substantially orthogonal to the top surface. The top surface extends radially from the rotational centre to the top surface edge. Each of the top plates has a leading edge coupled to the base. Each top plate is passively transitionable between a first position above at a first height, and a second position above the top surface at second height. The rotor may also have a bottom surface with a plurality of bottom plates coupled thereto and disposed radially around the rotational centre. The bottom plates can be passively transitionable between a raised position and lowered position.

Wind energy assemblies which contain arrays of wind diodes, which arrays are assembled into a wind energy collector assembly.

The Vertical Tilting Blade Turbine Windmill device is for capturing kinetic energy from the wind and is comprised of a vertical shaft having a central hub connectively attached, the central hub having a plurality of wind capture arms comprising a rotating wind capture blade having a capture surface and a slicing edge that are rotated by a rotating gear and drive gear combination connectively attached to said wind capture blades enabling a rotation of said wind capture blades wherein the wind capture blades are rotated between a blade-mode to capture the wind and a knife-mode to pass with less drag resistance through the air/wind thereby enabling an increase in the ability to capture more of the energy available in an on-coming wind stream.