Patent ID: 8941946
Filing Date: 2015-01-27
Classification: F16C,G11B,H02K

Abstract:
1. A motor comprising: a stationary portion; and a rotating portion arranged to be rotatable about a central axis extending in a vertical direction with respect to the stationary portion; wherein the stationary portion includes: the rotating portion includes: the cup portion includes: a lubricant is arranged between the sleeve portion and a combination of the shaft and the cup portion; a first seal portion is defined in a gap between the outer circumferential surface of the sleeve portion and an inner circumferential surface of the cylindrical portion, and a liquid surface of the lubricant is located in the first seal portion; and at least one of an outer circumferential surface of the first conical portion and an inner circumferential surface of the sleeve portion includes a first dynamic pressure generating groove array arranged to induce a dynamic pressure in the lubricant.