Temperature calculation and test verification of wind turbine main bearing
1. School of Energy and Power Engineering, Beihang University, Beijing 100083, China; 2. Beijing Goldwind Science ＆ Creation Windpower Equipment Co., Ltd., Beijing 100176, China
Abstract：During the generating of turbine, the temperature tests of the front and rear bearings on the generator were conducted to obtain temperature curve and temperature rise curve. According to the relationship between the power curve and the temperature rise curve, the temperature rise values of the front and rear bearings under the full power generation were calculated. The load at the center of the hub was obtained according to the blade root load. The frictional torques in the front and rear bearings and the generating heat by the frictional torque were calculated. Based on the calculated frictional heat, the temperature values of the front and rear bearings of the main shaft system under the full power generation were calculated by finite element method. The difference between the theoretical temperature and the test temperature was analyzed. The effects of radial load, bearing preload, bearing size, grease viscosity and bearing speed on bearing temperature were analyzed in detail. The results show that the radial load and the temperature rise of the front bearing are much larger than those of the rear bearing. Among the four friction torques, the thermal power loss caused by the sliding friction torque is significantly higher than those by other friction torques. The temperature rise of the bearing varies with the preload force, and the greater the pretension force is, the greater the temperature rises. The increasing of pretension force has great effect on the temperature rise of front bearing and has small effect on the temperature rise of rear bearing.
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DENG Zhidang1,2, SUN Tao2. Temperature calculation and test verification of wind turbine main bearing[J]. Journal of Jiangsu University(Natural Science Eidtion)
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2020, Vol. 41 
