F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F03 MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
F03D WIND MOTORS
7/00 Controlling wind motors
F03D7/02 the wind motors having rotation axis substantially parallel to the air flow entering the rotor
F03D7/0276 controlling rotor speed, e.g. variable speed