Analysis And Research Of Wind Turbine Pitch Bearing Performance

Pitch bearing is the most important part of the wind turbine variable pitch system,its fatigue life and reliability has important influence of the wind turbine operation and power quality. In the base of the study on variable pitch system of the wind turbine,this paper anlyzed the performance of pitch bearing in the static load and fatigue life prediction. In order to improving the traditional numerical calculation method, we consider the effect of the bearing contact angle changes on the ball bearings load. Using the bearing size data of the American National Renewable Energy calculation report to set up 3D model, Import into the finite element pretreatment software, established the sample model of the wind turbine pitch bearing using nonlinear spring based on Hertz contact theory. Calculating the static performance of 7 operating conditions, attain the change rules of the bearing ball contact angle. Using the contact angle to calculate and analysis the maximum ball load and maximum contact stress. Found that this method is more reasonable after comparing the method to the traditional numerical calculation which is not considering the change of contact angle effect. Calculation the static load factor of the pitch bearing. Calculating and anlyzing the fatigue life of the pitch bearing using a improved fuction based on the traditional one, because the pitch bearing is a oscillating bearing and the improved fuction also considering the effect of the contact angle. The calculation result has a reference value. The results showed:this method can find out the weakness of designing, all of these offered reference to the designing and running of the pitch bearing in the future.