Spindle motor and storage disk drive apparatus

A spindle motor comprising:

• a stator unit including a stator concentric with a central axis, a base portion with an axially extending through hole, and a printed circuit board including a connection portion and an extending portion extending from the connection portion, the connection portion connected to a conductive wire extending from the stator and through the through hole;
• and
• a rotor unit rotatably supported by the stator unit about the central axis with respect to the stator unit;
• wherein the base portion includes:
• a lower surface;
• a recess portion on the lower surface to accommodate the connection portion of the printed circuit board;
• and
• a groove portion on the lower surface in communication with the recess portion, the extending portion of the printed circuit board being arranged in the groove portion;
• a cured resin material is provided within the recess portion to cover at least a region extending from a connection point of the connection portion to a boundary between the recess portion and the groove portion;
• and
• a trench portion extending upwards from a bottom surface of the groove portion or a protrusion portion protruding downwards from the bottom surface of the base portion is defined in at least a portion of the groove portion to extend between opposite lateral surfaces of the extending portion and corresponding side surfaces of the groove portion;
• the lower surface of the base portion includes a central region substantially concentric with the central axis and a peripheral region arranged around the central region at a position higher than the central region, the recess portion and the groove portion being arranged within the central region;
• and
• the cured resin material is either arranged radially inward from a tip of the protrusion portion or arranged radially inward from a radially outer end portion of the trench portion.