Patent Number: 8,573,937

Title: System for providing dynamic pitch control in a wind turbine

Abstract: A system for providing dynamic pitch control in a wind turbine. In accordance with an embodiment, the dynamic pitch control uses a starting spring to pitch the blades of the wind turbine into a starting position that is suited for very low wind speeds. The pitch control then automatically pitches the blades into a run position as the rotation speed increases, using a combination of a rotational mass and a restraining spring. This allows the turbine to be started, and to generate power, at a much lower starting wind speed yet still operate at optimal speeds in its typical running range. In accordance with an embodiment, as the wind speed further increases beyond an overspeed limit, the rotational mass overcomes its restraining spring, and automatically pitches the blades back toward and beyond their start position, reducing the likelihood of damage to the turbine caused by high rotation speeds.

Inventors: Preus; Robert W. (Newberg, OR)

Assignee: Xzeres Corp.

International Classification: F01D 7/02 (20060101); F03D 7/04 (20060101)

Expiration Date: 1/05/12017