Study on the structural strength of MW scale wind turbine’s main shaft

Abstract

The main shaft of the wind turbine is an important supporting component of the wind turbine and its performance directly affects the safety of turbine. The structural strength of the main shaft under the 7 ultimate load conditions is checked according to the working load data. The results show that the maximum working stress 182 MPa occurred in Mx (max) load conditions is less than the permissible stress. For the maximum limit working conditions, this paper proposes a method to change the diameter of the end of the main shaft to reduce the working stress. The results show that there is an approximate linear relationship between the diameter of the inner hole at the end of the main shaft and the maximum working stress. On the premise of keeping the quality unchanged, the maximum working stress can be effectively reduced by reducing the diameter of the inner hole, which improves the structural strength of the casting main shaft.