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Spindle Motor using Ferro-Fluid Seal between Bearing

IP.com Disclosure Number: IPCOM000114404D
Original Publication Date: 1994-Dec-01
Included in the Prior Art Database: 2005-Mar-28
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Matsuda, H: AUTHOR [+3]

Abstract

Disclosed is a structure for spindle motors used in Hard disk Drives. The spindle motors are often supported on both ends to increase the stiffness. This kind of Spindle motor has a ferro-fluid seal to protects contamination from bearing. This spindle motor has the ferro-fluid seal between top and bottom bearing to keep bearing span, even though low profile Hard disk drive.

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Spindle Motor using Ferro-Fluid Seal between Bearing

      Disclosed is a structure for spindle motors used in Hard disk
Drives.  The spindle motors are often supported on both ends to
increase the stiffness.  This kind of Spindle motor has a ferro-fluid
seal to protects contamination from bearing.  This spindle motor has
the ferro-fluid seal between top and bottom bearing to keep bearing
span, even though low profile Hard disk drive.

      Fig. 2 shows usual spindle motor structure of both ends
support.  The motor has two bearing and one ferro-fluid seal above
top bearing.  Ferro-fluid seal protects contamination from bearing by
stopping airflow through the bearings.

      In low profile hard disk drive, three is no space to attach
ferro-fluid seal, therefore the spindle motor structure must be
change to cantilever type like Fig. 3, but the spindle motor
stiffness in this kind of structure decreases.

      Fig. 1 shows new spindle motor structure to solve this problem.
Ferro-fluid seal exits between top and bottom bearings, and can stop
airflow thorough the bearings.  The bearing span can also be keep
wide, and the stiffness of spindle motor increase.