Spindle motor
AssigneePanasonic Corporation
InventorsKatsuo Ishikawa, Tsutomu Hamada
Life of this patent
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Abstract
A spindle motor including a rotor hub which is rotationally driven by a magnetic action of a rotational magnetic field generated when a current is applied to a wire wound around teeth of a stator core and a magnetic field of a magnet provided on a rotor. Herein, the stator core formed by laminating magnetic steel plates is mounted to an outer periphery of a supporting part of a rotation support shaft of the rotor hub, and the supporting part is made of sintered metal containing a ferromagnetic material. This spindle motor can suppress generation of vibration and noise even when it is reduced in size.
Claims10
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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 hubs and a magnet,
- the rotor capable of being rotationally driven by a magnetic action of a rotational magnetic field created when a current is applied to the wire wherein
- a support part of the rotation support shaft and the stator core are respectively made of sintered metal containing a ferromagnetic material, and
- a hydrodynamic bearing comprising an operating fluid 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.
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Dependencies are inferred from the claim text.