A fluid turbine is described herein. The fluid turbine is subject to internal stresses, which can increase the frequency of maintenance or cost of construction, including fixing or replacing one or more components or increasing the amount of material used. One or more support arms of the fluid turbine can be provided in a given manner to generate a force during rotation that opposes one or more other forces, thereby reducing or eliminating the internal stresses exerted on the fluid turbine. For example, the one or more support arms can be provided in a given orientation or with given masses to generate the opposing force. In another example, the one or more support arms can be shaped or angled to generate an aerodynamic force.

An energy-harvesting building structure has multiple levels, a vertical shaft (central vortex tower] to direct wind upward toward an outlet at the top, and multiple wind powered turbines in the shaft. Wind collection areas on multiple levels are exposed to multiple directions. Wind vanes pivot into a backstopped position for redirecting wind to spiral inward toward the shaft. Wind twisters receive and further redirect wind inward and upward into the shaft to feed an air vortex driving the turbines at different levels. Two concentric stages of wind vanes may be included within wind collection areas, with the inner stage vanes having a surface which deforms in one direction but not the other. The building can include occupancy zones between wind collection levels. Heated air can be released into the bottom of the shaft to feed the vortex. At a top level, another wind turbine can draw wind up the shaft.

A rotor blade assembly of a wind turbine includes a rotor blade having an aerodynamic body with an inboard region and an outboard region. The inboard and outboard regions define a pressure side, a suction side, a leading edge, and a trailing edge. The inboard region includes a blade root, whereas the outboard region includes a blade tip. The rotor blade also defines a chord and a span. Further, the inboard region includes a transitional region of the rotor blade that includes a maximum chord. Moreover, a unitless first derivative of the chord with respect to the span of the rotor blade in the transitional region ranges from about −0.10 to about 0.10 from the maximum chord over about 15% of the span of the rotor blade. In addition, the unitless first derivative of the chord with respect to the span a slope of a change in the chord in is greater than about −0.03 at an inflection point of the chord in the outboard region.

A support system may secure a wind turbine above an angled roof. The angled roof may have a first angled surface, an opposite second angled surface, and a peak between the first angled surface and the second angled surface. The support surface may have a first weighted ballast located along a portion of the first angled surface and a second weighted ballast located along a portion of the second angled surface. The support system may have a connector extending between and connecting a portion of the first weighted ballast and a portion of the second weighted ballast. The connector may extend over the peak. The support system may have a mounting portion on the connector for securing a wind turbine to the connector. The first weighted ballast and the second weighted ballast may be sized and weighted to maintain the wind turbine above the peak during wind conditions.

The present invention, a multi-axial variable height wind turbine, includes a wind turbine, a structural support, a tilting boom extending between said structural support and said wind turbine, a multiaxial drive mechanism extending upwardly from said structural support for receiving said tilting boom where the multiaxial drive mechanism operationally connects the tilting boom to the structural support for rotation along a plurality of axes. The tilting boom includes a counterweight system positioned opposite said wind turbine which includes a moveable mass which is moved along the tilting boom by a drive mechanism for movement of the wind turbine between a raised position and a lowered position. The wind turbine also includes a plurality of pitched blade members extending between an inner hub and an outer ring.

A separable fluid turbine rotor turbine is described herein. The fluid turbine includes blades and support arms to adjoin the blades to a hub. The blades, support arms, or blades and supports can be assembled from a plurality of segments which are adjoined via one or more connectors. The connectors can be internal or external to the blade or support arm segments. Additional connectors can be used to adjoin the blades and support arms, the blades and the hub, and the support arms and the hub.

Wind turbine systems with wind directors are disclosed. The wind director is configured to simultaneously reduce drag force applied to a returning blade and increase force applied to an advancing blade. In some embodiments, the wind director includes an inlet having an inlet width configured to receive wind at a proximal end, and an outlet having an outlet width on a distal end opposite the proximal end. The wind director is configured to position near a wind turbine such that wind exiting the outlet is applied to an advancing blade of the wind turbine. Furthermore, the wind director provides a barrier to a returning blade opposite the first blade, thereby reducing drag force applied thereto. The wind director may further comprise a secondary duct which has an angled outlet and is configured to apply an additional force to the returning blade.

The present invention, a multi-axial variable height wind turbine, includes a wind turbine, a structural support, a tilting boom extending between said structural support and said wind turbine, a multiaxial drive mechanism extending upwardly from said structural support for receiving said tilting boom where the multiaxial drive mechanism operationally connects the tilting boom to the structural support for rotation along a plurality of axes. The tilting boom includes a counterweight system positioned opposite said wind turbine which includes a moveable mass which is moved along the tilting boom by a drive mechanism for movement of the wind turbine between a raised position and a lowered position. The wind turbine also includes a plurality of pitched blade members extending between an inner hub and an outer ring.

The present invention relates generally to systems, devices and methods for the efficient use of utilities, more particularly to the distribution and provision of electricity supply at appropriate voltages, monitoring and usage by end devices, and to facilitating consumers in changing their energy usage behaviour, and to adopt and easily install appropriate sustainable, energy efficient or renewable technologies. Said end devices typically including traditional electric, electronic and lighting appliances requiring AC or DC power provision or low voltage DC power via AC/DC converters.

Methods, systems, and devices are disclosed for wind power generation. In one aspect, a wind power generator includes a support base; inductors positioned over the support base in a circular array; an annulus ring track fixed to the base support and providing a circular track around which the inductors are located; an annulus ring rotor placed on the annulus ring track and engaged to rollers in the circular track so that the annulus ring rotor can rotate relative to the an annulus ring track, in which the annulus ring rotor include separate magnets to move through the circular array of inductors to cause generation of electric currents; and a wind rotor assembly coupled to the annulus ring rotor and including wind-deflecting blades that rotate with the rotor and a hollow central interior for containing a wind vortex formed from deflecting wind by the blades to convert into the electric energy.