Low power spindle motor with a fluid dynamic thrust bearing...

Details Low power spindle motor with a fluid dynamic thrust bearing... Low power spindle motor with a fluid dynamic thrust bearing...

2005-12-27

2005-12-27

Tupper, Robert S. (Department: 2652)

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

C360S090000, C384S112000

Reexamination Certificate

active

06980393

ABSTRACT:
A spindle motor for use in a disk drive having a rotor assembly and a stator assembly. The rotor assembly has a hub and a rotating shaft with an outer diameter, the hub being mounted for rotation on the rotating shaft. The stator assembly has a bearing sleeve with a bottom opening, the rotating shaft being inserted into the bearing sleeve for rotation. A counter-plate is inserted into the bottom opening of the bearing sleeve thereby closing the bottom opening. A thrust plate is mounted on the rotating shaft in opposing relationship with the counter-plate, the thrust plate having an outer diameter. A fluid dynamic thrust bearing is formed between the counter-plate and the thrust plate. A ratio between the outer diameter of the shaft to the outer diameter of the thrust plate is reduced to reduce spindle motor's power consumption.

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