Patent ID: 8873198
Filing Date: 2014-10-28
Classification: F16C,G11B,H02K

Abstract:
1. A motor comprising: a rotating portion including a rotor magnet; and a stationary portion including a stator which faces the rotor magnet, wherein the stationary portion includes: a shaft component which includes an inner shaft portion which is disposed around a central axis, and an outer shaft portion which is fixed to an outer circumferential surface of the inner shaft portion; an upper plate portion which is disposed on one side of the shaft component and extends radially outward from the one side of the shaft component; and a lower plate portion which is disposed on the other side of the shaft component and extends radially outward from the other side of the shaft component, the rotating portion includes a sleeve portion which is disposed between the upper plate portion and the lower plate portion, lubricating oil is continuously provided between 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, a lower thrust dynamic pressure generating groove array is provided on at least one surface of a lower surface of the sleeve portion and an upper surface of the lower plate portion, which define the lower thrust gap, a radial dynamic pressure generating groove array is provided on at least one surface of an inner circumferential surface of the sleeve portion and an outer circumferential surface of the outer shaft portion, which define the radial gap, the radial dynamic pressure generating groove array includes an upper radial dynamic pressure generating groove array and a lower radial dynamic pressure generating groove array, the inner shaft portion is fixed to the outer shaft portion in an interference fit state, and a range of a fixing region in an axial direction between the inner shaft portion and the outer shaft portion in an interference fit state is included in a range between the upper radial dynamic pressure generating groove array and the lower radial dynamic pressure generating groove array.