Motor and disk drive apparatus

摘要

A rotating portion of a motor includes a magnet, a yoke including a yoke cylindrical portion, and a hub including a hub cylindrical portion. A first radial gap, which is a radial gap between the magnet and the yoke cylindrical portion, is filled with an adhesive from an upper axial end to an axial middle portion thereof, and includes a tapered gap gradually increasing in radial width with decreasing height. An upper axial end of the tapered gap is located above the axial middle portion of the first radial gap. In addition, no adhesive is provided from a lower axial end to an axial middle portion of a second radial gap, which is a radial gap between the yoke cylindrical portion and the hub cylindrical portion.

主权项

1. A motor comprising:
a stationary portion including an armature; and a rotating portion configured to be rotatable about a central axis extending in a vertical direction; wherein the rotating portion includes:
a cylindrical or substantially cylindrical magnet including a pole surface positioned radially opposite to the armature;a yoke including a yoke cylindrical portion positioned radially outside of the magnet; anda hub including a hub cylindrical portion positioned radially outside of the yoke, and an annular disk mount portion extending radially outward from an outer circumference of the hub cylindrical portion; a first radial gap has a greater radial width at a lower axial end thereof than at an upper axial end thereof, the first radial gap being a radial gap between an outer circumferential surface of the magnet and an inner circumferential surface of the yoke cylindrical portion; a second radial gap has a greater radial width at a lower axial end thereof than at an upper axial end thereof, the second radial gap being a radial gap between an outer circumferential surface of the yoke cylindrical portion and an inner circumferential surface of the hub cylindrical portion; the first radial gap includes a tapered gap gradually increasing in radial width with decreasing height from an upper axial end thereof; the upper axial end of the tapered gap is located axially above an axial middle portion of the first radial gap; the first radial gap is filled with an adhesive from at least the upper axial end to the axial middle portion thereof; and no adhesive is located from at least the lower axial end to an axial middle portion of the second radial gap.