Disclosed is an apparatus for controlling rotation speed and brake of a landscape windmill according to wind speed. The apparatus includes: a rotary shaft rotatably installed on a frame provided in a structure of the landscape windmill; a driving motor having a gearbox to rotate the rotary shaft and provided in the structure; windmill blades engaged to one end of the rotary shaft which is exposed to the outside of the structure; a brake part, provided on the frame, for braking the rotation of the rotary shaft; a wind speed sensor provided on a lateral portion or upper end of the structure to measure current wind speeds; a wind speed monitoring part for displaying the wind speed measured by the wind speed sensor on a display in real time, and outputting the measured value; and a control unit for comparing the measured wind speed value received from the wind speed monitoring part with a set wind speed value stored in advance, and when the measured wind speed value is equal to the set wind speed value, controlling the driving motor and the brake part to accelerate or decelerate the rotation speed of the windmill blades, or braking the rotary shaft. Therefore, the wind speed is measured in real time, and the process of decelerating the rotation of the windmill blades or operating the brake part is carried out automatically on the basis of the measurement. It is possible to prevent damage to the landscape windmill due to forcible rotation caused by strong wind or squall.
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