Patent ID: 8514515
Filing Date: 2013-08-20
Classification: G11B,H02K

Abstract:
1. A motor comprising: a rotating portion including a rotor magnet; and a stationary portion including a stator facing the rotor magnet; wherein the stationary portion includes: the rotating portion includes a sleeve portion disposed between the upper plate portion and the lower plate portion; a lubricating oil is provided continuously between an upper thrust gap between the sleeve portion and the upper plate portion, a radial gap between the sleeve portion and the outer shaft portion, and a lower thrust gap between the sleeve portion and the lower plate portion; an upper seal portion is arranged radially outward from the radial gap and between the stationary portion and the rotating portion, an upper surface of the lubricating oil being located in the upper seal portion; a lower seal portion is arranged radially outward from the radial gap and between the stationary portion and the rotating portion, a lower surface of the lubricating oil being located in the lower seal portion; a lower thrust dynamic pressure generating groove array is defined on at least one surface of a lower surface of the sleeve portion and an upper surface of the lower plate portion, the lower surface of the sleeve portion and the upper surface of the lower plate portion defining the lower thrust gap; a radial dynamic pressure generating groove array is defined on at least one surface of an inner circumferential surface of the sleeve portion and an outer circumferential surface of the outer shaft portion, the inner circumferential surface of the sleeve portion and an outer circumferential surface of the outer shaft portion defining the radial gap; and at least a portion in an axial direction of a fixing range, in which the outer shaft portion and the inner shaft portion radially overlap, radially overlaps with an existing range in the axial direction of the radial gap.