Patent ID: 8324771

Claim:
A spindle motor for use with a storage disk drive apparatus, the spindle motor comprising: a stator unit; and a rotor unit supported to be rotatable about a central axis with respect to the stator unit; wherein the stator unit includes: a stator arranged around the central axis; a base portion including a through hole passing therethrough in a direction parallel or substantially parallel to the central axis, and arranged on a lower side of the rotor unit in the direction parallel or substantially parallel to the central axis; and a circuit board attached to a lower surface of the base portion, and including a connection portion to which a conductive wire from the stator is connected after passing through the through hole, and a strip-shaped extending portion arranged to extend from the connection portion; the lower surface of the base portion includes: a recess portion arranged to accommodate the connection portion of the circuit board; and a groove portion arranged to extend from the recess portion to have the extending portion arranged therein; and at least a portion of a bottom surface of the groove portion defines a protrusion portion arranged to protrude downwards; the strip-shaped extending portion is arranged to extend over the protrusion portion; the lower surface of the base portion further includes: a central region concentric with the central axis; and a peripheral region arranged radially outward of the central region and a position of the peripheral region with respect to the direction parallel or substantially parallel to the central axis being at a level higher than that of the central region; the recess portion and the groove portion are arranged within the central region.