Patent ID: 7420309

Claim:
A spindle motor comprising: a rotor magnet supported by a hydrodynamic bearing device so as to be rotatable; a stator core formed by laminating a plurality of magnetic material plates which have salient pole teeth portions facing the rotor magnet with a predetermined gap interposed therebetween, salient pole arm portions which is connected to the salient pole teeth portions, and a yoke portion connected to the salient pole arm portions and fixed to a base; and windings wound at least around the salient pole arm portions of the stator core, wherein the plates of the magnetic material of the stator core has the salient pole teeth portions facing an opposing surface of the rotor magnet substantially perpendicularly, being bent at first bent portions between the salient pole teeth portions and the salient pole arm portions such that the salient pole teeth portions and the salient pole arm portions are substantially parallel, and a thickness of the first bent portions of the plates is made thinner than that of other portions, and the plates are bent at second bent portions between the yoke portions and the salient pole arm portions such that the yoke portion and the salient pole arm portions are substantially parallel, and a thickness of the second bent portions of the plates is made thinner than that of other portions; and the plurality of magnetic material plates are laminated such that gaps are generated above and below the first and second bent portions.