| US 7,541,708 B2 | ||
| Spindle motor | ||
| Katsuo Ishikawa, Ozu (Japan); and Tsutomu Hamada, Hirakata (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Filed on Dec. 23, 2005, as Appl. No. 11/315,310. | ||
| Claims priority of application No. 2004-375159 (JP), filed on Dec. 27, 2004. | ||
| Prior Publication US 2006/0158060 A1, Jul. 20, 2006 | ||
| Int. Cl. H02K 7/08 (2006.01) | ||
| U.S. Cl. 310—90 [310/216] | 5 Claims |
| 1. A spindle motor comprising:
a stator comprising a stator core having teeth;
a wire wound around the teeth of the stator core; and
a rotor comprising: a rotation support shaft, a rotor hub and a magnet,
the rotor capable of being rotationally driven by a rotational magnetic field created when a current is applied to the wire,
wherein the stator core comprises a laminated plurality of magnetic steel plates mounted to an outer periphery of a supporting
part of the rotation support shaft of the rotor,
the supporting part of the rotation support shaft comprises sintered metal containing a ferromagnetic material, and can be
passed through a magnetic flux of the rotational magnetic field,
a hydrodynamic bearing comprising an operating fluid filled between the rotation support shaft and the supporting part, and
at least a portion of the supporting part of the rotation support shaft which comes into contact with the operating fluid
is pore-sealed treated.
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