Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1988-09-22
1990-05-22
Salce, Patrick R.
Electrical generator or motor structure
Dynamoelectric
Rotary
29596, 310 67R, 360 9908, H02K 500, G11B 5012
Patent
active
049280295
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: 4535373 (1985-08-01), Schuh
patent: 4554473 (1985-11-01), Muller
patent: 4607182 (1986-08-01), Ballhaus
patent: 4658312 (1987-04-01), Elasasser et al.
patent: 4717977 (1988-01-01), Brown
patent: 4731554 (1988-03-01), Hall et al.
patent: 4739427 (1988-04-01), Kilmer et al.
patent: 4814652 (1989-03-01), Wright
Maxtor Corporation
Rebsch D. L.
Salce Patrick R.
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