Characteristics of heat transfer in small disk enclosures at high rotation speeds

Author

Sato, Isamu ; Otani, Koji ; Mizukami, Makoto ; Oguchi, Shigemitu ; Hoshiya, Kunio ; Shimokura, Ken-ichiro

Author_Institution

NTT Appl. Electron. Lab., Tokyo, Japan

Volume

13

Issue

4

fYear

1990

fDate

12/1/1990 12:00:00 AM

Firstpage

1006

Lastpage

1011

Abstract

Experimental results are reported for heat transfer in small disk enclosures containing several 5.25-in-diameter disks and two symmetrical brushless DC motors mounted on a spindle. The air flow over the disk is probably turbulent at a rotation speed of more than 5400 r.p.m., and windage loss dominates the total rotation loss. Effective forced convection reduces the temperature increase inside the enclosure. There is not much temperature dependence on disk position, because heat generation in the enclosure is symmetrical. Track densities of more than 100 tr/mm are shown to be feasible as a result of the small thermal off-tracking and head position deviation

Keywords

convection; hard discs; packaging; 5.25 inch; disk enclosures; forced convection; head position deviation; heat generation; heat transfer; rotation loss; symmetrical brushless DC motors; thermal off-tracking; windage loss; Brushless DC motors; Coils; Distortion measurement; Heat transfer; Information processing; Magnetic heads; Pollution measurement; Temperature; Thermal expansion; Thermistors;

fLanguage

English

Journal_Title

Components, Hybrids, and Manufacturing Technology, IEEE Transactions on

Publisher

ieee

ISSN

0148-6411

Type

jour

DOI

10.1109/33.62542

Filename

62542