Abstract
This paper investigates the dynamic characteristics of 600MW turbo-generator stator core, including the bending modes, the torsional modes, the elliptical modes, the axial modes and the triangular modes. The magnetic pull formula under the steady-state condition is firstly deduced, based on which the pulsating characters and the core deformation due to the pull excitation are analyzed. Then, the finite element (FE) model of the stator core is set up and imported into ANSYS Workbench to calculate the natural frequencies and the vibration modes. Finally, the calculation is verified via comparing with the experimental data in the published papers. It is shown that the first natural frequency is much larger than the excited working frequency, which means the stator core is in a safe operation condition. The calculation proposed in this paper accords well with the experimental data obtained by other researchers.
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