Base plate for spindle motor

Details Base plate for spindle motor Base plate for spindle motor

2006-10-17

2006-10-17

Schuberg, Darren (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S090000, C310S06700R, C310S091000, C360S099040, C360S099080, C360S098070

Reexamination Certificate

active

07122922

ABSTRACT:
A base plate for a spindle motor is provided defining a minimal axial gap with a relatively rotatable magnet. In an example, a surface of the base plate is positioned at 0.1 mm from an adjacent surface of a relatively rotatable magnet. The base plate is comprised of a composite material such that stiffness is improved and acoustic vibration is reduced, while maintaining low power consumption and a fast start-up time. A first material, being a nonmagnetic material is employed adjacent to a motor magnet, and a second material having a preferred stiffness is employed at a greater radial distance from the magnet than the radial distance between a stator and the magnet.

REFERENCES:
patent: 4814914 (1989-03-01), Hagiwara et al.
patent: 4998033 (1991-03-01), Hisabe et al.
patent: 5452156 (1995-09-01), Uda et al.
patent: 5479304 (1995-12-01), Morita
patent: 6005748 (1999-12-01), Heine et al.
patent: 6844636 (2005-01-01), Lieu et al.
patent: 07007883 (1995-01-01), None

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