Patent ID: 8333006

Claim:
A method for removing a crack in an electromechanical rotor, comprising: providing an electromechanical rotor, the electromechanical rotor having a core portion, a plurality of slots formed on an outer surface of the core portion along an axial direction of the electromechanical rotor, the slot being configured to receive a coil, and a groove formed on both side walls of the slot, the groove being configured to hold a wedge for maintaining the coil in said slot, the core portion including a crack developed from a contact surface between the wedge and the slot along a circumferential direction; forming a first cut hole by cutting off a portion including the crack from an outer surface of said core portion toward a center axis of the core portion across the crack between adjacent slots along a circumferential direction of the core portion; and forming a second cut hole on an edge between a bottom surface of the first cut hole and a side surface of the first cut hole so as to have a given curvature.