Patent ID: 8631576

Claim:
A method of attaching a rotor of a wind turbine generator to a nacelle, the method comprising: an assembly step in which three wind-turbine rotor blades are radially attached to a rotor head around a rotation axis of the rotor to assemble the rotor on the ground; a cable attaching step in which a first end of a first cable is attached to a first hoisting portion provided on the rotation axis of the rotor on the rotor head to which the wind-turbine rotor blades have been attached, a first end of a second cable is attached to a second hoisting portion provided on the rotor head at a position away from the rotation axis of the rotor, and a second end of the first cable and a second end of the second cable are attached to a same single crane portion of a single crane which is separately provided from the wind turbine generator; a hoisting step in which the rotor is hoisted only with the first cable; a rotor raising step in which the first cable is extended so that the rotor is hoisted with the second cable; and a rotor attaching step in which the rotor hoisted with the second cable is attached to the nacelle.