Patent ID: 8508883
Filing Date: 2013-08-13
Classification: F16C,G11B,H02K

Abstract:
1. A motor comprising: a rotating portion including a rotor magnet; and a stationary portion including a stator radially 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; the sleeve portion includes: the upper plate portion includes: the lower plate portion includes: a lubricating oil is continuously arranged between the upper plate portion, the shaft portion, the lower plate portion, and the sleeve portion; an upper seal gap which opens upward is defined between an outer circumferential surface of the upper plate cylindrical portion and an inner circumferential surface of the outer sleeve cylindrical portion; an upper seal portion is arranged in the upper seal gap, a top surface of the lubrication oil being located in the upper seal portion; a lower seal gap which opens upward is defined between an outer circumferential surface of the outer sleeve cylindrical portion and an inner circumferential surface of the lower plate cylindrical portion; a lower seal portion is arranged in the lower seal gap, a bottom surface of the lubrication oil being located in the lower seal portion; a lower thrust dynamic pressure generating groove array is arranged on at least one surface of a lower surface of the sleeve flange portion and an upper surface of the lower plate connecting portion; a radial dynamic pressure generating groove array is arranged on at least one surface of an outer circumferential surface of the shaft portion and an inner circumferential surface of the inner sleeve cylindrical portion; and at least a portion of the upper seal portion and at least a portion of the lower seal portion radially overlap with a radial gap between the outer circumferential surface of the shaft portion and the inner circumferential surface of the inner sleeve cylindrical portion.