In-spindle motor assembly for disk drive and method for fabricat

Details In-spindle motor assembly for disk drive and method for fabricat In-spindle motor assembly for disk drive and method for fabricat

1988-05-02

1989-05-16

Echols, P. W.

Metal working

Method of mechanical manufacture

Electrical device making

29598, 360 9701, 310318, H02K 1500

Patent

active

048296570

ABSTRACT:
An in-spindle disk drive motor incorporating a novel two-piece aluminum spindle and a method for fabricating the same. The spindle is hollow and contains a removable steel flux sleeve on which plastic permanent magnets are mounted. The spindle is mounted by means of two bearings to a non-rotating stator shaft disposed through the center of the spindle and rigidly attached to a disk drive base. One of the bearings is located in a removable bearing sleeve at the top of the spindle and the other is located beyond the steel sleeve at the bottom end of the spindle. The aluminum spindle eliminates thermal distortion effects caused in prior art in spindle motors by thermal expansion differences between aluminum disks and non-aluminum spindles.

REFERENCES:
patent: 4667137 (1987-05-01), Macleod
patent: 4717977 (1988-01-01), Brown
patent: 4754353 (1988-06-01), Levy

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