TWI663330B

The present invention provides an active windmill structure, which is to configure a plurality of blade sets on the periphery of a pivotally rotatable transmission base to be distributed to be separated from each other by a corresponding angle and capable of being rotated to be opened or closed by the ratio of their weights or by electric control. Each of the blade sets is respectively configured with at least one blade disposed at two sides of the transmission base. The blades located at the two sides of the transmission base are perpendicular to each other for extension and are pivotally rotatable synchronously toward the same direction. When the wind comes from the front, one blade set in the horizontal axis is automatically opened in the horizontal direction to minimize the wind resistance. When the wind comes from the rear, the other corresponding blade set in the horizontal axis is automatically closed in the vertical direction to maximize the wind resistance. The blades may generate the pushing force i