Disk drive motor with thermally matched parts

Details Disk drive motor with thermally matched parts Disk drive motor with thermally matched parts

1987-02-27

1989-03-21

Salce, Patrick R.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

310 67R, 310 89, 360 9808, G11B 5012, H02K 700

Patent

active

048146528

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 removeable 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: 4519010 (1985-05-01), Elsaesser et al.
patent: 4558245 (1985-12-01), Glasauer et al.
patent: 4607182 (1986-08-01), Ballhaus
patent: 4672487 (1987-06-01), Brand et al.
patent: 4672488 (1987-06-01), Wright

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