Effect of Generator Rotor Radial Deviation on the Unbalanced Magnetic Pull of 1000 MW Hydro-Generator Unit

The 1000 MW hydro-generator unit has huge geometrical dimensions and requires high installation accuracy. control of its deviation will directly affect the quality operational performance rotor eccentricity is one core problems faced in operation giant unit. This paper presents a method to calculate asymmetric magnetic field by means transient finite element calculation reveal effect generator radial on unbalanced pull effects dynamic are analyzed time frequency domains, respectively. results show that both DC component key harmonic increase with value, this variation relationship nearly linear. when no more than 0.15 mm, caused calculated be small, which acceptable. conclusions investigation can help straighten out requirements standards for large units.