Patent ID: 8608449

Claim:
A large vertical axis wind turbine comprising: a tower frame, said tower frame being a truss structure and comprising at least 3 sub-tower frames in parallel with each other and forming a polygon from a top view, a platform disposed on the tower frame for installing and fixing a generator, a vertical central axis supported on the tower frame, said vertical central axis being hollow with a truss structure disposed therein, and a vertical axis windmill supported on the tower frame, the vertical axis windmill comprising supporting arms for supporting a plurality of blades of the vertical axis wind turbine, wherein said supporting arms of said vertical axis windmill are rotatable around said vertical central axis; each of said sub-tower frames is a hollow tube; a ratio of a diameter of said vertical axis windmill to a distance between two adjacent sub-tower frames is between 2.5 and 6; and a ratio of the diameter of said vertical axis windmill to a height of said tower frame is between 3 and 0.5, and wherein said truss structure in said vertical central axis extends heterogeneously from the bottom to the top, said truss structure at the bottom has a high density and said truss structure on the top has a low density.