Patent ID: 7936078
Filing Date: 2011-05-03
Classification: F03D,F05B,Y02E

Abstract:
1. A variable speed wind turbine, comprising (a) a rotor including a hub having a longitudinal axis and a plurality of blades connected with said hub and extending radially therefrom; (b) a rotor shaft connected with said hub and driven for rotation by said rotor in response to wind striking said rotor blades; (c) a variable ratio gearbox connected with said rotor shaft, said variable ratio gearbox having first and second output shafts which rotate at speeds that are not in fixed proportion to the speed of rotation of said rotor shaft; (d) a fixed speed generator connected with said first output shaft of said variable ratio gearbox; and (e) a variable speed generator connected with said second output shaft of said variable ratio gearbox, said fixed and variable speed generators producing electrical outputs.