Patent ID: 8542459

Claim:
A motor comprising: a stationary portion including a stator; and a rotating portion including a rotor magnet, and rotatably supported by the stationary portion through a lubricating oil; wherein the stationary portion includes: a shaft portion centered on a central axis extending in a vertical direction; and an upper thrust portion arranged to extend radially outward from an upper portion of the shaft portion; the rotating portion includes: a sleeve portion arranged opposite to an outer circumferential surface of the shaft portion and a lower surface of the upper thrust portion; a tubular portion arranged to extend upward from an outer edge portion of the sleeve portion, and arranged opposite to an outer circumferential surface of the upper thrust portion; and an annular seal cap arranged above the tubular portion; the lower surface of the upper thrust portion and an upper surface of the sleeve portion are arranged to together define an upper thrust gap therebetween, the lubricating oil is located in the upper thrust gap, the outer circumferential surface of the upper thrust portion and an inner circumferential surface of the tubular portion are arranged to together define an upper seal portion therebetween, the upper thrust gap is arranged to be in communication with the upper seal portion, and the upper seal portion includes a surface of the lubricating oil located therein; the seal cap includes: a first seal cap lower surface which is an annular surface facing axially downward; and a second seal cap lower surface which is an annular surface facing axially downward and which is arranged radially outward of the first seal cap lower surface; the tubular portion includes: a first tubular portion upper surface which is an annular surface arranged axially opposite to the first seal cap lower surface; and a second tubular portion upper surface which is an annular surface arranged radially outward of the first tubular portion upper surface and arranged to be in contact with the second seal cap lower surface; the first tubular portion upper surface includes an oil-repellent film region covered with an oil-repellent film; and the first tubular portion upper surface and the first seal cap lower surface are arranged to together define a substantially annular radially extending gap therebetween.