When the windmill rotates, it rotates around its own axis, which is one of the movements. At the same time, because the blades of the windmill are fixed around the axis, not the rotating shaft itself, the whole windmill will also do translation movement. In addition, due to the wind, the blades of the windmill will swing up and down, which can be regarded as a vibration movement.
The rotation of windmill can be regarded as compound motion, including rotary motion, translational motion and vibration motion. Under the action of these movements, the windmill can take advantage of wind energy to actively rotate and convert the kinetic energy generated by rotation into other forms of energy such as electric energy.
The meaning of windmill
Windmill is a device that uses wind energy to convert energy. Rotating parts include bearings, shafts, rotors and blades, which rotate under the action of wind.
The wind acts on the blades of the windmill. Because of the different air pressure, the blade will produce a large pressure on one side and a small negative pressure on the other side, which will lead to the rotation of the blade.
Under the action of the wind, the blades start to rotate, and the rotor and shaft also rotate. The shaft is fixed on the rocker arm through the bearing, and the rocker arm is connected with the generator through the main shaft. The faster the rotating speed, the more electricity the generator generates. At the same time, the angle of windmill blades can also be adjusted by mechanical system or electronic control, so as to adjust the position and direction of blades to obtain the maximum wind energy conversion efficiency.
Generally speaking, the rotation of a windmill is a process in which the wind acts on the blades and is transmitted to the generator through the rotating parts to convert mechanical energy into electrical energy. Wind power, blade design, rotor speed and generator efficiency all affect the efficiency of wind energy conversion.
The origin of windmills
The origin of windmills can be traced back to China and the Middle East around 2000 BC. According to historical records, the earliest windmill was a mechanical device for pumping water, which was called "sail windmill" or "Oriental windmill".
This windmill is composed of many wooden boards with the same geometric shape, similar to modern barrels or drums. The wind rotates on these plates, and the rotating shaft can drive the water pump to lift water. With the passage of time, this traditional windmill has been improved and developed, and many types have been derived, such as "vertical windmill" and "horizontal axis windmill".
Medieval Europe was another important birthplace of windmill technology. Due to good climatic conditions and rapid urbanization, European countries need more effective methods to provide various resources, such as flour and textiles. As a result, European craftsmen and scientists began to develop various types of windmills, from vertical axis windmills to horizontal axis windmills, from small windmills to large windmills.