Fluid dynamic bearings (FDBs) are applied to most of the spindle motors of computer hard disk drives (HDDs) since FDBs provide better dynamic characteristics, such as lower vibration and noise, than ball bearings. However, a weakness of FBDs is instability arising from air bubbles in the oil lubricant of FDBs. One possible solution to expel the trapped air bubbles out of FDBs is to include recirculation channel (RC). RC is designed to balance the pressures between upper and lower parts of FDBs and to circulate the oil lubricant as well as to expel air bubbles out of FDBs. This paper experimentally and numerically investigates the behavior of the air bubble in oil lubricant of operating FDBs due to the design of the RC. We created the FDBs with transparent cover and performed the experiment to visually observe the behavior of trapped air bubbles. Also, we numerically studied the phenomena of expelling the air bubble. The flow field of FDBs is calculated by the Navier-Stokes equation and the continuity equation. And we numerically explained that large pressure difference between upper and lower regions of RC and fast flow velocity along RC expel the air bubble out of FDBs. This research can be effectively utilized to develop robust FDBs by expelling the air bubbles out of FDBs.
Skip Nav Destination
ASME 2014 Conference on Information Storage and Processing Systems
June 23–24, 2014
Santa Clara, California, USA
Conference Sponsors:
- Information Storage and Processing Systems Division
ISBN:
978-0-7918-4579-0
PROCEEDINGS PAPER
Effect of the Cross-Sectional Shape of Recirculation Channel on Expelling Air Bubbles in the FDBs of HDD Spindle Motors
H. H. Shin,
H. H. Shin
Samsung Electro-Mechanics Co. Ltd., Suwon, Gyeonggi, Korea
Search for other works by this author on:
J. Y. Jeong
J. Y. Jeong
Samsung Electro-Mechanics Co. Ltd., Suwon, Gyeonggi, Korea
Search for other works by this author on:
Y. H. Jung
Hanyang University, Seoul, Korea
G. H. Jang
Hanyang University, Seoul, Korea
C. H. Kang
Hanyang University, Seoul, Korea
H. H. Shin
Samsung Electro-Mechanics Co. Ltd., Suwon, Gyeonggi, Korea
J. Y. Jeong
Samsung Electro-Mechanics Co. Ltd., Suwon, Gyeonggi, Korea
Paper No:
ISPS2014-6933, V001T05A004; 3 pages
Published Online:
August 15, 2014
Citation
Jung, YH, Jang, GH, Kang, CH, Shin, HH, & Jeong, JY. "Effect of the Cross-Sectional Shape of Recirculation Channel on Expelling Air Bubbles in the FDBs of HDD Spindle Motors." Proceedings of the ASME 2014 Conference on Information Storage and Processing Systems. 2014 Conference on Information Storage and Processing Systems. Santa Clara, California, USA. June 23–24, 2014. V001T05A004. ASME. https://doi.org/10.1115/ISPS2014-6933
Download citation file:
8
Views
Related Articles
Related Chapters
Experimental and Statistical Study on the Noise Generated by Surface Defects of Bearing Rolling Bodies
Bearing and Transmission Steels Technology
Completing the Picture
Air Engines: The History, Science, and Reality of the Perfect Engine
Energy Balance for a Swimming Pool
Electromagnetic Waves and Heat Transfer: Sensitivites to Governing Variables in Everyday Life