Wind Turbine Of Low Wind Speeds

摘要

Horizontal axis W/T of low wind speeds of propeller type, bearing a main rotor of three blades (1), while in the space between two successive blades (1) and diametrically opposite to the third, an additional 4th blade (2) also of propeller type but of significantly longer length, is interposed. This additional blade (2) is not permanently coupled but selectively engaged in the system of the W/T at low wind speeds, contributing to the startup and enhancing the energy production. The blade (2) bears diametrically opposite a counterweight (15) to balance the forces developed, and rotates in a plane parallel to the main rotor. The coupling of the blade (2) is preferably made at the stand-by state or at low wind speed operation of the W/T, while the uncoupling will be performed during operating state and at the rated power. The blade (2) after uncoupling, gets in vertical position and remains immobilized attached to the tower (3).

主权项

1. A horizontal axis wind turbine of propeller type comprising two separate rotors, a main and conventional rotor comprising three blades (1) with symmetrically arranged blades (1) permanent fixed to the main shaft (4) and the generator, and an additional 4th blade (2) also of propeller art, of longer length, and selectively coupled to the three conventional blade rotor, both rotating in their coupling phase in parallel planes to each other, in the same direction, and coaxial with the shaft (4);
wherein the additional 4th blade (2) at its coupling phase is positioned in the space between two successive conventional blades (1) and diametrically opposite to the third conventional blade (1) of the said three blade rotor, where the additional 4th blade (2) during its coupling phase rotates at the same rotational speed with the said three blade rotor, where the additional 4th blade (2) during its uncoupling phase is remaining in a stand-by position, been stopped and stored in vertical position always along and at the front of the tower (3) toward the wind direction, where the additional 4th blade (2), during its uncoupling phase, is not connected direct or indirect to the main shaft (4) and to the generator.