What different kinds of bearings are used in wind turbines?

By Paul Dvorak This article is part of the 2017 Renewable Energy Handbook. A complete digital version of the handbook is here: https://goo.gl/Sg4mHO
A wide range of bearings perform different functions throughout a wind turbine. For instance:
The slewing ring bearing from Kaydon is available without gears, or gears on inside or outside.
Slewing ring bearings are typically found in the pitch and yaw locations of a turbine and help ensure that the blades rotate smoothly. As long as proper maintenance procedures are observed, they do not usually experience many problems besides normal wear and tear over time.
Spherical roller bearings are often used in the main

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