Spindle motor for hard disk drives

Details Spindle motor for hard disk drives Spindle motor for hard disk drives

2005-08-30

2005-08-30

Nguyen, Tran (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S06700R, C360S099080

Reexamination Certificate

active

06936944

ABSTRACT:
Disclosed is a spindle motor for hard disk drives capable of generating mechanical and electrical preloads to form a predetermined sized air gap through use of mechanical and electrical offsets, so that the spindle motor is prevented from being damaged by friction and heat generated during an initial starting. The spindle motor with mechanical and electrical offsets is designed so that a midpoint of the vertical width of the poles wound around by a coil of a stator is placed within a magnetic field so as not to be flush with a midpoint of the vertical width of a permanent magnet fitted on the inner circumferential surface of the hub, and each of the poles has at least one of its upper and lower end extending in a vertical direction by a predetermined length to distribute magnetic flux density differently between the upper and lower ends of each pole.

REFERENCES:
patent: 4200344 (1980-04-01), Binns et al.
patent: 5880545 (1999-03-01), Takemura et al.
patent: 6583952 (2003-06-01), Grantz et al.
patent: 08-212686 (1996-08-01), None
patent: 2000-324777 (2000-11-01), None

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