MOTOR, FAN AND MANUFACTURING METHOD OF THE SAME

摘要

A motor according to the present invention includes a boss portion 34 preferably includes an inner ring portion 342 having at an axially lower end surface thereof a substantially ring shaped convex portion 3421. The boss portion 34 preferably includes at a central portion thereof a through hole at which a shaft 32 is press fitted. A rotor holder 31 having a substantially cylindrical shape includes a through hole 321 centered about a rotary axis. The through hole 321 and the inner ring portion 342 of the boss portion 34 are fitted to one another. The convex portion 3421 includes a portion plastically deformed outwardly in the radial direction so as to sandwich an inner circumferential surface 3211 of the rotor holder 31. The inner circumferential surface of the impeller cup portion 22 includes a plurality of convex portions 221 near an upper portion thereof. The rotor holder 31 is press into the inner circumferential surface of the impeller cup portion via the convex portions 221.