Apparatus for improving the performance of a rotational wind ene

Fluid reaction surfaces (i.e. – impellers) – Articulated – resiliently mounted or self-shifting impeller... – Resilient bias or mount

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416 11, 416 60, 416170R, F03D 1102

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active

043137130

ABSTRACT:
A system of coil springs of proper elastic constant(s) is attached on one end to the (horizontal or vertical) shaft of a wind energy conversion system and on the other end to the rotor, thereby forming a non-rigid connection between the two. The direction of the spring windings is such as to wind, in the relative motion of the rotor with respect to the shaft, in the direction of the rotor rotation. The system of springs generally consists of two or more sections each with an appropriate elastic constant. The spring sections are connected to each other through a rotating wheel with appropriate mass and mass distribution, so as to maximize the moment of inertia. A tube-like sleeve which rotates freely with respect to the shaft and the mass wheel, acts as a support for the rotor and the rotating mass. The system of springs and masses (inertia) improves the performance of a rotational wind energy conversion system in many ways, e.g., lowers stresses on hardware, increases and optimizes energy extraction from the wind, lowers the minimum wind velocity at which energy can begin to be obtained, minimizes effects due to resonant vibrations, etc.

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patent: 3924827 (1975-12-01), Lois
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patent: 4180369 (1979-12-01), Ottosen

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