DocumentCode
1489814
Title
Theoretical analysis of a ball bearing used in HDD spindle motors for reduction of NRRO
Author
Noguchi, S. ; Tanaka, K. ; Ono, K.
Author_Institution
NSK Ltd., Kanagawa, Japan
Volume
35
Issue
2
fYear
1999
fDate
3/1/1999 12:00:00 AM
Firstpage
845
Lastpage
850
Abstract
In this paper, we theoretically analyzed the NRRO of the ball bearing caused by form errors of the inner and outer raceways and balls. The results are summarized as follows: (1) as for geometrical errors of the inner and outer raceways, it is possible to reduce the NRRO to less than 1 nm by choosing either 12 or 18 balls, even if the inner and outer raceways have harmonic undulation of less than the eleventh order; (2) the effect of the differences in ball diameter and ball form error on the NRRO monotonously decreases as the number of balls increases
Keywords
disc drives; hard discs; harmonics; machine bearings; small electric machines; HDD spindle motors; HDDs; NRRO; ball bearing; ball diameter; ball form error; form errors; geometrical errors; harmonic undulation; raceways; Analytical models; Ball bearings; Costs; Disk recording; Equations; Hard disks; Instruments; Machining; Magnetic heads; Tracking;
fLanguage
English
Journal_Title
Magnetics, IEEE Transactions on
Publisher
ieee
ISSN
0018-9464
Type
jour
DOI
10.1109/20.753796
Filename
753796
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