Patent ID: 8143751
Filing Date: 2012-03-27
Classification: G11B,H02K

Abstract:
1. A motor, comprising: a stator unit with a stator; a substantially cylindrical closed-top rotor unit, the stator arranged inside the rotor unit; and a bearing mechanism arranged to support the rotor unit in such a manner as to permit rotation of the rotor unit about a central axis with respect to the stator unit, wherein the rotor unit includes a rotor hub, which defines at least a cover portion of the rotor unit, and an annular magnetic field generating member arranged below the cover portion and outside the stator; the cover portion of the rotor unit includes a through-hole and a lower opening positioned arranged opposed to the magnetic field generating member at a lower portion of the through hole; and one of the cover portion and the magnetic field generating member includes an annular salient portion provided radially inwards of the lower opening, the annular salient portion protruding annularly about the central axis toward, and making contact with, the other of the cover portion and the magnetic field generating member.