VERIFICATION OF AXI-PERIODIC ANALYSIS WITH 3D-FEA AND CALCULATION OF EDDY CURRENT LOSS OF FLUX SHIELD IN THE LARGE TURBO GENERATOR USING AXI-PERIODIC ANALYSIS

摘要

Axi-periodic analysis for end region of large turbine generator is studied and verified by 3D-FEA inthis paper. Verification is done by comparing three components of flux densities from axi-periodic analysis and 3D FEA in static field, and the comparison shows some differences, and the cause of those differences are studied. Even though, the differences, considering computation time and effort for modeling of 3D FEA, the errors would be acceptable for initial design of large turbine generator. Then, axi-periodic analysis is extended to time harmonic field for its application. From the time harmonic field analysis, the effect of flux shield and eddy current loss in the flux shield for power angles are presented.