Abstract: There is provided a spindle motor including: a base member including a bend portion; an installation member having an insertion groove formed therein and a stator core fixed thereto, the insertion groove having the bend portion inserted thereinto; and a sleeve fixed to an inner peripheral surface of the installation member.

Abstract: There are provided a rotating member assembly and a spindle motor including the same. The rotating member assembly includes: a shaft including an outer surface step part provided in an outer surface thereof; and a rotor hub including an insertion hole into which the shaft is inserted, the insertion hole including an inner surface step part provided in an inner surface thereof and corresponding to the outer surface step part, such that the inner surface step part and the outer surface step part are fittingly-coupled to each other.

Abstract: There are provided a rotating member assembly and a spindle motor including the same. The rotating member assembly includes: a shaft including an outer surface step part provided in an outer surface thereof; and a rotor hub including an insertion hole into which the shaft is inserted, the insertion hole including an inner surface step part provided in an inner surface thereof and corresponding to the outer surface step part, such that the inner surface step part and the outer surface step part are fittingly-coupled to each other.

Abstract: Disclosed herein is a spindle motor having a fluid dynamic bearing as an oil gap formed between a rotator and a stator, wherein the stator includes a sleeve having a protruding part extending in a circumferential direction formed on the upper part thereof, the rotator includes a hub including an oil interface forming member positioned under the protruding part of the sleeve and coupled to the lower end thereof, and an oil interface of the oil gap is formed between the upper part of the oil interface forming member and the lower part of the protruding part of the sleeve.

Abstract: There is provided a motor including: a sleeve supporting a shaft and a thrust plate coupled to the shaft through oil; a hub operating together with the shaft and including a magnet coupled thereto; a base including the sleeve and a core coupled thereto, the core including a coil wound therearound; and a base cover coupled to the sleeve to thereby close a lower portion of the sleeve, wherein an interval between the sleeve and the hub is smaller than an interval between the thrust plate and the base cover in order to maintain a state of non-contact between the thrust plate and the base cover.

Abstract: There is provided a spindle motor including a stator and a rotor, including: a shaft rotatably mounted with respect to the stator; and a rotor case coupled with the shaft and including a protruding part protruded axially downwardly from a lower portion of an inner diameter part thereof, wherein the shaft is provided with an outer wall part formed to have an insertion groove opened axially upwardly into which the protruding part is inserted so as to compensate for a reduction in adhesion due to a reduction in a thickness of the rotor case.

Abstract: Disclosed herein is a spindle motor having a fluid dynamic bearing as an oil gap formed between a rotator and a stator, wherein the stator includes a sleeve having a protruding part extending in a circumferential direction formed on the upper part thereof, the rotator includes a hub including an oil interface forming member positioned under the protruding part of the sleeve and coupled to the lower end thereof, and an oil interface of the oil gap is formed between the upper part of the oil interface forming member and the lower part of the protruding part of the sleeve.