蒸发冷却水轮发电机定子变形研究

he curling deformation of the stator lamination caused by the temperature difference between the core and frame will seriously endanger the safe operation of the generator. A method to calculate the deformation in the stator of large hydro-generators with evaporation-cooling system is developed in this paper. The physical and mathematic model is presented. Using the FEM the stator deformation of large hydro-generators can be calculated. As an example the deformation of the lamination and frame, the stress and curling safe coefficient under different operations for the 400MW evaporation-cooled hydro-generator at Lijiaxa Power Station have been calculated. After analyzing the calculated results and comparing with other generators, some useful conclusions for design can be made and it has been proved that the evaporation cooling system is an effective, easy maintained and safe cooling system.