Rotor device for use in fan motor, has shielding case with upper wall, hub with another upper wall that is attached to shielding case, and through hole and openings that are arranged to be offset from each other

摘要

The device has a shielding case with an upper wall. A hub has another upper wall that is attached to the shielding case. A through hole (215) and openings (226) are arranged to be offset from each other. The former upper wall provides the openings that are placed near a circumference of a slant plate shaped projection part. The hole provides a slant wall at long sides in parallel with a slope as the projection part.