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3D Magnetic Field and Loss Analysis at the No Load Condition in the End Region of 4-Poles Large Turbine Generator

To study the principle of magnetic field and loss at the end region of large 4-poles large turbine generator, 3D transient electromagnetic field finite element (FE) models of the end region are established respectively. Considering the factors such as rotor motion, core non-linearity and time-varying of electromagnetic field, the anisotropic heat conductivity and different heat dissipation conditions of stator end region, a 50Hz, 1150MW, 4-poles large turbine generator is investigated. The magnetic field and loss at no-load condition of the generator end region are calculated and the calculation results are compared with the test data. The result shows that the calculation model is accurate.