Spindle motor

Details Spindle motor Spindle motor

2008-01-22

2008-01-22

Schuberg, Darren (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

Reexamination Certificate

active

07321178

ABSTRACT:
In a spindle motor in which teeth portions of a stator core formed by laminating magnetic plates are bent in order to increase the number of turns of the stator windings, a gap in the teeth portions between the magnetic plates is avoided and a precise attractive force adjustment becomes possible. The stator core is bent such that its teeth portions faces a surface of a rotor magnet at right angles, and the teeth portions and salient pole arm portions around which windings are wound are substantially parallel to each other. The salient pole arm portions locate approximately halfway between a lower surface of a hub and an upper surface of a base. Further, a thickness of a magnetic plate is set to be 0.5 to 0.9 times that of other portions.

REFERENCES:
patent: 5694268 (1997-12-01), Dunfield et al.
patent: 5859486 (1999-01-01), Nakahara et al.
patent: 6759784 (2004-07-01), Gustafson et al.
patent: 2004/0090701 (2004-05-01), Byun et al.
patent: 2006/0103248 (2006-05-01), Tamaoka
patent: 3052540 (2000-04-01), None
patent: 2004-166497 (2004-06-01), None
patent: 2006-158188 (2006-06-01), None

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