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Apparatus for absorbing stator vibrations in computer storage apparatus
| Details |
Inventors: Yoshida, Mitsuaki; Kaneko, Hisashi;
Assignee: Fujitsu Limited (Kawasaki, JP)
Primary Examiner: Thomas; Tom
Assistant Examiner: Giordana; Adriana
Attorney, Agent or Firm: Greer, Burns & Crain, Ltd.
A rotary driving apparatus controls the generation of vibration and noise due to high speed rotation, to realize high accuracy rotation, so that a storage apparatus such as a disk drive can have high speed rotation and improved storing density on its recording medium. The apparatus includes a fixed shaft for rotatably supporting a rotor, a bearing fitted between the shaft and the rotor, at least two projections projecting from the surface of the shaft, and a stator coil mounted on the projections. The projections absorb stator vibration, and isolate the head, the storage disk and other parts from the stator vibrations. A gap area is formed between the stator coil and the shaft to dampen vibrations created by the stator. The gap may be filled with vibration-absorbing material. |
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DETAILED DESCRIPTION Accordingly, one object of the present invention is to provide a rotary driving apparatus that controls vibration and noise caused by high speed rotation of a rotor.
By reducing vibration, high accuracy rotation is realized.
Another object of the present invention is to provide a storage apparatus that controls generation of vibration and noise caused by high speed rotation of a spindle motor.
By reducing vibration and noise, the head reads and writes information more accurately, thus, increasing the storage density of a recording medium.
Another object of the present invention is to provide a storage apparatus capable of suppressing vibration and noise generated by the spindle motor.
Such suppression enables higher speeds and highly accurate positioning of the head.
One aspect of the present invention is a rotary driving apparatus in a storage apparatus having a stator and a rotor.
A shaft or other fixed part rotatably supports the rotor through a bearing which is fitted between the fixed part and the rotor.
At least two circumferential ring-shaped vibration dampeners are fixed between the stator and the fixed part by a bonding agent.
The ring-shaped dampeners are fixed such that an annular gap remains between the stator, the rings, and the fixed part.
A bonding agent secures the dampeners to the stator and the fixed part.
During assembly, excess bonding agent can fill the annular gap and harden to form a solid tubular vibration dampener.
Another aspect of the invention includes the combination of a stator, at least two ring-shaped vibration dampeners fixed between the stator and the fixed part, and a sheet-shaped vibration dampener located between the stator and a rest.
The rest is located on the fixed part beneath the stator.
The sheet-shaped vibration dampener is a sheet material constructed from a resin or a rubber material capable of absorbing vibrations.
The sheet-shaped vibration dampener also improves accuracy of the stator's fitting position.
In yet another aspect of the invention, at least two ring-shaped vibration dampeners are fixed between the stator and the fixed part
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