The present invention relates to a generator (1) of a wind power generation facility (100) or a hydro power plant (200), particularly a generator rotor (5) for a low speed rotating generator. According to the present invention, the generator rotor 5 is provided with a rotor belt 15 for supporting a plurality of pole shoes, a shaft 15 for fixing the generator rotor 5 to the shaft of the wind power generator 100, particularly a main shaft or a gear shaft , Or a hub flange (19) for fixing to a plurality of turbine blades of a hydroelectric power plant (200), and a support structure (17), the support structure being supported on the rotor belt (15) Wherein the rotor belt 15 is made of a metallic material having a first damping ratio D 1 and at least one of the support structure 17 or the hub flange 19 is connected to the hub flange 19, And the second damping ratio D 2 is higher than the first damping ratio D 1. The second damping ratio D 2 is a material having a second damping ratio D 2 partially or entirely.
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