Patent ID: 7083378

Claim:
A wind generator including a body installed freely rotatably at an upper portion of a tower, blades installed at a leading end of the body, a gearbox for receiving rotational force from the blades and increasing a rotational speed, and a generator connected to the gearbox for generating electricity by means of the increased rotational force received from the gearbox, wherein: the blades are coupled with a blade angle adjustment unit so that angles of the blades can be adjusted according to wind direction and velocity, the gearbox includes planet gears coupled with a rotational shaft of the blades, a ring gear which has teeth formed on a radially inner surface thereof and engages with the planet gears, and a sun gear which engages with the planet gears and is connected with the generator, a stop gear is installed to be rotated while being engaged with teeth formed on a radially outer surface of the ring gear, and the wind generator further includes an electronic brake connected to the stop gear for fixing or rotating the ring gear by intermittently controlling the rotational motion of the stop gear, wherein the blade angle adjustment unit includes a casing which is fixed to the leading end of the body and of which a leading end is supported so that the respective blades can be rotated, bevel gears fixed to leading ends of the blades, and a rotational speed reducer which is fixed to the casing and has a bevel gear engaged with the bevel gears of the blades.