Research on Stator-Core Temperature Characteristics under Static Air-Gap Eccentricity in Turbo-generator

The stator-core temperature characteristics under the static air-gap eccentricity in turbo-generator is analyzed and calculated in this paper. Firstly, the theoretical formula of magnetic field density under static air-gap eccentricity is deduced. Then, the calculation formula of hysteresis loss and eddy current loss of the stator-core based on the theoretical formula of magnetic field density is obtained and regular pattern is analyzed under static air-gap eccentricity. Finally the three-dimensional generator model was established to analyze stator-core temperature field distribution under static air-gap eccentricity by Maxwell-Ansys Workbench. The simulation results were consistent with the theoretical analysis, which verifies accuracy of the research method. It is shown that hysteresis loss and eddy current loss of the stator-core will increase due to the increment of static air-gap eccentricity, which further leads to the rise of stator-core temperature.