Balance correction device for rotor

A balance correction device for a rotor, the balance correction device correcting balance of the rotor, the balance correction device comprising:

• a rotary drive to rotate the rotor around a rotation axis of the rotor;
• a laser oscillator to remove a part of the rotor by irradiating the rotor with a laser beam from a rotation-axis direction of the rotor;
• a rotation angle sensor to detect a rotation angle of the rotor;
• an irradiation position setting device to set a laser irradiation position in a radial direction of the rotor;
• and
• a controller configured to:
• control the rotary drive, the laser oscillator, and the irradiation position setting device;
• irradiate an imbalance correction position of the rotor with the laser beam based on an output of the rotation angle sensor so as to leave an outer peripheral portion of the rotor;
• and
• control a radial position of the laser irradiation position, a rotation speed of the rotor, and a laser output of the laser oscillator to form a groove in the rotor by the laser irradiation with a groove depth, in the rotation-axis direction, shallower toward a side closer to an outer periphery of the rotor.