Spindle motor and disk drive apparatus

摘要

A spindle motor includes a stationary portion and a rotating portion. The stationary portion includes a base member, a stator core, coils, and a circuit board. The base member includes a middle region, a peripheral region, jetty portions, a recessed portion, and at least one through hole. The jetty portions are positioned at least axially below the peripheral region, and include a pair of extension portions. The recessed portion is arranged inside the jetty portions, and a portion of the circuit board is arranged in the recessed portion. The at least one through hole is arranged to pass through the middle region in an axial direction. The recessed portion is covered with a sealant.

主权项

1. A spindle motor comprising:
a stationary portion; and a rotating portion configured to be rotatable about a rotation axis extending in a vertical direction with respect to the stationary portion; wherein the stationary portion includes:
a base member extending in directions perpendicular to the rotation axis;a stator core positioned axially above the base member;coils attached to the stator core, and including lead wires; anda circuit board located on a lower surface of the base member; the base member includes:
a middle region which is a flat surface which surrounds the rotation axis;an outer circumferential portion positioned radially outside the middle region, the outer circumferential portion being an arc extending more than 180° around the middle region to define a major arc;a peripheral region positioned radially outside the middle region, and positioned axially above the middle region;jetty portions including a pair of extension portions, each of which is continuous with the middle region and extends in a direction away from the rotation axis, and arm portions, each of which extends from a tip portion of a separate one of the pair of extension portions in a direction different from a direction in which a corresponding one of the extension portions extends, the jetty portions are positioned at least axially below the peripheral region, and a portion of the jetty portion positioned at least radially outside the outer circumferential portion;a recessed portion located inside the jetty portions, and in which a portion of the circuit board is provided; andat least one through hole positioned radially inward of the outer circumferential portion which passes through the middle region in an axial direction; the lead wires of the coils are passed through the at least one through hole to reach a lower side of the base member, and are electrically connected to the circuit board; and the recessed portion is covered with a sealant.