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High Quality Rolling Pitch Bearing for Wind Generator
Pitch bearing, also known as blade bearing, is a component of modern wind turbine (wind generator), which is used to connect rotor hub and rotor blade. The pitch bearings allow the required oscillations to control the load and power of the wind turbine. The pitch system brings the blades to the required position by adjusting the aerodynamic angle of attack. The pitch system is also used for emergency interruption of the turbine system.
Design of pitch bearings
Most large rolling bearings are used as pitch bearings for wind generator. The pitch bearing bears high bending moment, radial and axial load in two directions. Therefore, the rolling element of the most advanced wind turbine is the ball bearing, which is used in the way of double-row four-point contact. This means that each raceway carries two points and a total of four points. Other possible options are different arrangements of rolling elements or multi-row cylindrical roller bearings. The pitch bearing diameter of modern wind turbines can reach more than 4 meters.
Lubricants can only be replaced with a large amount of time and cost. In addition, due to the continuous rotation of the hub, the used lubricant must remain in place. Therefore, pitch bearings in wind turbines are usually lubricated with grease. The bearing will experience various operating conditions during operation. Therefore, the operating conditions of lubricating grease are very difficult during the whole turbine time. The industrial greases used so far have very different compositions and do not always achieve the expected wear resistance.
Load condition of pitch bearings
The load and operation condition of pitch bearing are unfavorable to rolling bearing. The pitch bearings are exposed to high loads and small reciprocating vibrations through the pitch system or created by motion from the wind profile. The micro reciprocating motion between the rolling body and the raceway will lead to wear phenomena such as false indentation and fretting corrosion. In addition, high load will cause the truncation of contact ellipse. Because the calculation method of small reciprocating motion to estimate the service life and friction torque of bearings is not applicable to pitch bearings.
High Quality Rolling Pitch Bearing for Wind Generator
Pitch bearing, also known as blade bearing, is a component of modern wind turbine (wind generator), which is used to connect rotor hub and rotor blade. The pitch bearings allow the required oscillations to control the load and power of the wind turbine. The pitch system brings the blades to the required position by adjusting the aerodynamic angle of attack. The pitch system is also used for emergency interruption of the turbine system.
Design of pitch bearings
Most large rolling bearings are used as pitch bearings for wind generator. The pitch bearing bears high bending moment, radial and axial load in two directions. Therefore, the rolling element of the most advanced wind turbine is the ball bearing, which is used in the way of double-row four-point contact. This means that each raceway carries two points and a total of four points. Other possible options are different arrangements of rolling elements or multi-row cylindrical roller bearings. The pitch bearing diameter of modern wind turbines can reach more than 4 meters.
Lubricants can only be replaced with a large amount of time and cost. In addition, due to the continuous rotation of the hub, the used lubricant must remain in place. Therefore, pitch bearings in wind turbines are usually lubricated with grease. The bearing will experience various operating conditions during operation. Therefore, the operating conditions of lubricating grease are very difficult during the whole turbine time. The industrial greases used so far have very different compositions and do not always achieve the expected wear resistance.
Load condition of pitch bearings
The load and operation condition of pitch bearing are unfavorable to rolling bearing. The pitch bearings are exposed to high loads and small reciprocating vibrations through the pitch system or created by motion from the wind profile. The micro reciprocating motion between the rolling body and the raceway will lead to wear phenomena such as false indentation and fretting corrosion. In addition, high load will cause the truncation of contact ellipse. Because the calculation method of small reciprocating motion to estimate the service life and friction torque of bearings is not applicable to pitch bearings.
