Fluid dynamic bearing system
a dynamic bearing and fluid technology, applied in sliding contact bearings, record information storage, instruments, etc., can solve the problems of increasing the power consumption of the motor, radial stiffness nor the power consumption of the journal arrangement designed according to the disclosed method, and achieves greater stability, radial stiffness nor the power consumption of the journal arrangement designed
Inactive Publication Date: 2009-06-04
SEAGATE TECH LLC
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- Description
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- Application Information
AI Technical Summary
Benefits of technology
This approach results in a journal arrangement with significantly greater stability and consistent power consumption, improving motor performance by reducing the influence of cross-coupled stiffness on shaft motion.
Problems solved by technology
As persons skilled in the art are aware, an ongoing challenge in fluid dynamic journal bearings is balancing the tradeoff between motor performance and power consumption.
However, an increase in the stiffness of the bearings is usually accompanied by an increase in the power consumption of the motor.
Further, neither the radial stiffness nor the power consumption of the journal arrangement designed according to the disclosed method decreases appreciably.
Method used
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[0018]FIG. 2 presents a partial cross-sectional view of an improved spindle motor arrangement 200 in one embodiment, in which three journal bearings 275, 280, and 285 are provided. The motor 200 first comprises a hub 210. The hub 210 includes an outer radial shoulder 205 for receiving a disc (not shown in FIG. 2). Disposed within the hub 210 is a sleeve 250. During operation, the sleeve 250 and hub 210 rotate together. In this arrangement, the sleeve 250 resides and rotates on a non-rotational thrust washer 265. A shaft 255, which is coupled to a base 230, is provided along the inner diameter of the sleeve 250 to provide lateral support to the sleeve 250 while it is rotated. Joined to a bottom surface of the sleeve 250 is a shield 260. The shield 260 encloses an outer portion of the thrust washer 265. Between an inner side of the shield 260 and the enclosed portion of the thrust washer, a gap 295 is formed. The motor 200 also includes a stator 245, which is mounted on a base 230. Th...
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Abstract
Fluid dynamic bearing systems produced by specified methods are provided. In one example, a method for designing a fluid dynamic bearing system includes determining a first stability ratio for a first journal bearing configuration. The method further includes determining a second stability ratio for a second journal bearing configuration. In a further example system, the first configuration has two sub-journal bearings and the second configuration has three sub-journal bearings. The method may comprise comparing the two stability ratios to determine whether adding a sub-journal increases the stability ratio of the bearing system.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This divisional application claims priority from U.S. patent application Ser. No. 10 / 792,177, filed on Mar. 2, 2004, and which is herein fully incorporated by reference as if fully set forth and for all purposes. U.S. patent application Ser. No. 10 / 792,177 claims priority from U.S. Provisional Pat. App. No. 60 / 464,001, filed on Apr. 18, 2003, and which is herein fully incorporated by reference as if fully set forth and for all purposes.BACKGROUND[0002]1. Field[0003]The present invention relates to fluid dynamic bearing motors and, more specifically, to a multi-journal fluid dynamic bearing motor assembly.[0004]2. Description of Related Art[0005]FIG. 1 provides a perspective view of a disc drive assembly 150. In this arrangement, a plurality of discs 110′ are stacked vertically within the assembly 150, permitting additional data to be stored, read and written. The drive spindle 151 receives the central openings 105 of the respective discs ...
Claims
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IPC IPC(8): F16C32/06F16C33/10G11B19/20
CPCF16C17/026F16C33/107Y10T29/497F16C2370/12Y10T29/49764G11B19/2009
Inventor HERNDON, TROY MICHAELLEBLANC, JEFFRY ARNOLDNOTTINGHAM, ROBERT ALANRAHMAN, MOHAMED MIZANUR
Owner SEAGATE TECH LLC