Modal Simulation and Verification on Stator End Winding of Large Nuclear Power Turbine Generator

The 1300 MW nuclear power turbine generator is a four-pole generator with a rated speed of 1500 r/min. Due to its large capacity and low speed, the stator core and stator end winding bear huge electromagnetic torque. At the same time, because of the large heat generated by the stator winding during operation, the stator end winding is subjected to a large thermal expansion force. All these loads may have a serious impact on the stator end winding. In this paper, the three dimensional parametric finite element method and modal optimization algorithm are used to obtain the finite element model of each component of the stator end winding. Finally, the modal natural frequency of the overall end winding structure is obtained, so that the four-lobe modal natural frequency avoids the excitation frequency of 100 Hz, and the accuracy of the simulation mode is verified by modal test. The stator end winding modal simulation provides a reference for the stator end winding structure design of the large nuclear power turbine generator, ensures the good dynamic characteristics of the end winding structure, which provides a guarantee for the safe and stable operation of the stator end winding.