Patent ID: 9001459
Filing Date: 2015-04-07
Classification: G11B,H02K

Abstract:
1. A motor, comprising: a stationary unit; a rotary unit including a rotor magnet; and a bearing mechanism arranged to support the rotary unit so as to rotate with respect to the stationary unit about a center axis extending in an up-down direction; wherein the stationary unit includes a stator positioned radially inward of the rotor magnet, a base portion positioned below the stator, and a stator fixing portion provided in a substantially cylindrical shape to extend upward from a central portion of the base portion, the stator being fixed to an outer circumferential surface of the stator fixing portion; the stator includes a stator core and a plurality of coils; the stator core includes an annular core-back and a plurality of teeth portions extending radially outward from the core-back; each of the teeth portions includes a coil winding portion wound with each of the coils, a tip end portion positioned radially outward of the coil winding portion, the tip end portion having a circumferential width larger than a smallest width of the coil winding portion, and an increased width portion positioned between the coil winding portion and the core-back, the increased width portion continuously extending from the coil winding portion and the core-back, the increased width portion having a circumferential width larger than the smallest width of the coil winding portion; the increased width portion includes a slanted portion extending radially outward and upward; an axial position of a magnetic center of the rotor magnet overlaps with an axial existence range of the tip end portion; and a thickness of the slanted portion in a direction perpendicular or substantially perpendicular to an upper surface of the slanted portion is smaller than an axial thickness of the coil winding portion.