Abstract: A motor includes a shaft along a central axis, an inner ring fixed on an outer circumferential surface of the shaft, a tubular sleeve extending axially around the shaft, an outer ring fixed to an inner circumferential surface of the sleeve via an adhesive agent, a cap annularly expanding around the shaft and covering an axially upper side of the inner and outer rings, and a bearing portion including dynamic pressure grooves in at least one of an outer circumferential surface of the inner ring and the inner circumferential surface of the sleeve. In the bearing portion, a stationary portion and a rotating portion face each other across a gap where lubricating oil is present. At least one interface of the lubricating oil is in a radial gap between the inner and outer rings. The cap includes a recess recessed axially downward over an entire circumference. At least a portion of an outer circumferential surface of the recess portion is fixed by press-fitting to an inner circumferential surface of the sleeve.

Abstract: A base portion of a motor includes an inner bottom plate portion, a recessed portion and groove portions recessed upward from a lower surface of the inner bottom plate portion, and at least one through hole passing through the inner bottom plate portion in an axial direction. The groove portions extend from the recessed portion toward land portions of a circuit board on a lower surface of the base portion. Conducting wires are drawn out from coils above the base portion to a draw-out surface through the at least one through hole, and are passed through communicating openings and the groove portions to be soldered to the land portions. Each of the at least one through hole is covered with the sealant. Drawing the conducting wires out of the recessed portion through the groove portions prevents the sealant in the recessed portion from overflowing toward the land portions.

Abstract: A base portion of a motor includes an annular inner bottom plate portion, a recessed portion and groove portions recessed upward from a lower surface of the inner bottom plate portion, and at least one through hole passing through the inner bottom plate portion in an axial direction. The groove portions are arranged to extend from the recessed portion toward land portions of a circuit board arranged on a lower surface of the base portion. A draw-out surface of the recessed portion has a lower opening of each of the at least one through hole defined therein. A wall surface of the recessed portion includes communicating openings each of which is in communication with one end of a separate one of the groove portions. Conducting wires are drawn out from coils arranged above the base portion to the draw-out surface through the at least one through hole, and are passed through the communicating openings and the groove portions to be soldered to the land portions. The recessed portion has a sealant arranged therein.