Improvements in Horizontal-Axis Wind Turbines

Problem: Conventional horizontal-axis wind turbines require a geared transmission, which tends to be large, heavy, prone to failure, and leads to losses. Technology: The invention describes two concepts to address the need to avoid the need for gear transmission. -Mount a circular shroud around the turbine-blade tips, carrying permanent magnets or iron laminations or possibly conductors. These would pass close to a short stator carried on the main turbine pillar that would generate the electric power. -Have a single permanent magnet or high-permeability-iron stack at the end of each blade of a wind turbine. A ΓÇ£statorΓÇØ would extend in an arc of 60 degrees (for a three-bladed rotor) on two sides of the main turbine column, creating a continuous torque on the turbine rotor and generating electric power. Christopher Noble crn@mit.edu

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