How Are Bearings Used in Wind Turbines

The bearing of most note in any wind turbine is the yaw bearing. This is a single bearing of considerable complexity.

This yaw bearing consists of a set of axial rollers set inside a circular bearing. This is then padded with a radial gliding pad to smooth the device’s movement.

This bearing is essential for allowing a wind turbine to capture the wind which can be coming from any direction.

When the wind blows, the moving air pushes the turbine around. The internal bearing rolls on the axial rollers, like shopping cart wheels, until the wind turbine is eventually pointed in a direction where the turbine can capture as much wind energy as possible in its rotors.

Because of the conditions wind turbines must endure over the course of their lifetime, the yaw bearing must be weather proofed, and water proofed, and constructed to last as long as the wind turbine does.

Another use of bearings in wind turbines is inside the gearbox, or transmission. The gearbox, generally a planetary gearbox, is full of moving parts that need to be carried, requiring a set of complex gears and bearings.

Additionally, the blades that catch the wind’s energy are held together by a rotor that is itself a fairly substantial bearing. Consider that the blades of the largest wind turbines can weigh in the thousands of pounds. This means the rotor is required to keep moving parts separated which bearing a substantial load.

Besides these majorly important bearings, there are other more minor uses for bearings in these devices.

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