A motor includes a bearing mechanism including a shaft disposed along a center axis extending in a lengthwise direction, a sealing member disposed on a lower side of the bearing mechanism, a stationary portion including a base constituting a part of the housing, and a rotary portion rotating relative to the stationary portion about the center axis via the bearing mechanism. The base has a through hole defined therein so as to have a center aligned with the center axis and pass through the base in an axial direction. The bearing mechanism is fixed to the base in a first fixing region defined between an inner circumferential portion of the base and an outer circumferential portion of the bearing mechanism. The sealing member is fixed to the base in a second fixing region defined between the inner circumferential portion of the base and an outer circumferential portion of the sealing member. At least one of the first fixing region and the second fixing region includes a sealing region.

An apparatus includes a stationary sleeve and a shaft operable to rotate with respect to the stationary sleeve. A hub rotates with respect to the stationary sleeve in response to the shaft rotating. A mechanically adjustable gap forming component is attached to the stationary sleeve and radially extends between the hub and a base. The mechanically adjustable gap forming component forms a radially extending gap above the mechanically adjustable gap forming component. The mechanically adjustable gap forming component is mechanically adjustable in an axial direction with respect to the stationary sleeve. The hub dynamically adjusts the radially extending gap above the mechanically adjustable gap forming component during rotation of the hub.

A spindle motor includes a shaft, a base part, a stator core, a rotor, and a bearing part. The shaft extends along a center axis extending in the vertical direction and has a screw hole extending axially downward from the upper end thereof. The screw hole has a screw part onto which a screw is screwed. The bearing part includes an upper annular member, a lower annular member, and a sleeve. The upper annular member and the lower annular member protrude radially outward from an outer peripheral surface of the shaft and are disposed to be spaced apart from each other in the axial direction. The sleeve covers the outer peripheral surface of the shaft, extends in the axial direction, and is defined in a cylindrical shape. The upper end of the upper annular member is disposed lower than the lower end of the screw part in the axial direction.

A spindle motor includes a shaft, a base part, a stator core, a rotor, and a bearing part. The shaft extends along a center axis extending in the vertical direction. The bearing part includes an upper annular member, a lower annular member, and a sleeve. The upper annular member and the lower annular member protrude radially outward from an outer peripheral surface of the shaft and are disposed to be spaced apart from each other in the axial direction. The sleeve covers the outer peripheral surface of the shaft, extends in the axial direction, and is defined in a cylindrical shape. The base part has an annular protruding portion that protrudes axially upward from the upper surface of the base part and surrounds the shaft. The stator core is held on an outer peripheral surface of the annular protruding portion.