Abstract
Abstract. Pitch bearings of wind turbines are large, grease-lubricated
rolling bearings that connect the rotor blades with the rotor hub. They are
used to turn the rotor blades to control the power output and/or structural
loads of the turbine. Common actuators turning the blades are hydraulic
cylinders or electrical motor–gearbox combinations. In order to design pitch
actuator systems that are able to turn the blades reliably without imposing
an excessive power demand, it is necessary to predict the friction torque of
pitch bearings for different operating conditions. In this paper, the results
of torque measurements under load are presented and compared to results
obtained using different calculation models. The results of this comparison
indicate the various sources of friction that should be taken into account
for a reliable calculation model.
Subject
Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment
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