Patent ID: 8729753

Claim:
A motor, comprising: a shaft; a sleeve rotatably supporting the shaft by hydrodynamic pressure; a base fabricated with a steel sheet; a core installation part fixed with respect to the base; and a stator core fixed to the core installation part, wherein the core installation part includes a mounting portion which is protruded to an outer radial direction from at least part of an outer circumferential face of the core installation part to form a support surface to retain the stator core in an axial position, wherein the stator core is fixed to the mounting portion and an outer circumferential face of the core installation part where the mounting portion is not formed, wherein the base has a fixing portion protruded upwardly in an axial direction, and the core installation part is fixed to an inner circumferential face of the fixing portion, wherein the sleeve is coupled to an inner circumferential face of the core installation part, and wherein a hydrodynamic part is formed on at least one of the outer circumferential face of the shaft and an inner circumferential face of the sleeve.