Magnetic Disk Apparatus Flow Stabilization via Segmented Plates
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Solution Overview
Problem
The magnetic disk apparatus experiences flow-induced vibration, or disk flutter, due to turbulence in the air flow around the disks, which degrades the positioning accuracy of the magnetic head, and existing methods to reduce this vibration either compromise structural strength or introduce assembly issues.
Innovation Solution
Inserting multiple plates between the disks with a constant gap to stabilize the air flow by reducing the pressure difference between the inner and outer circumferences, thereby separating the turbulent flows and reducing instability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a shroud is used to cover the outer circumference of the magnetic disk, then the disk flutter is reduced by stabilizing the flow, but the pressure difference between inner and outer circumferences increases causing turbulent flow
Solution Approach 1:
The invention divides the gap between the magnetic disk and shroud into multiple smaller gaps by inserting partition members. This segmentation allows the flow to be divided into multiple streams, reducing the overall pressure difference across the gap while maintaining flow stability. Each partition member creates a separate flow path, preventing the formation of large-scale turbulent eddies that would occur in a single large gap.
Solution Approach 2:
The partition members act as intermediary elements between the magnetic disk and the shroud. These partition members modify the flow characteristics by creating multiple smaller flow paths, which reduces the pressure difference and prevents turbulent flow. The partition members serve as mediators that stabilize the flow without requiring direct contact with the magnetic disk surface.
2Stability of the object's composition
If the gap between the magnetic disk and shroud is narrowed, then the disk flutter is reduced, but the pressure difference between inner and outer circumferences increases causing turbulent flow
Solution Approach 1:
Instead of narrowing the entire gap uniformly, the invention segments the gap into multiple smaller gaps using partition members. This allows the overall gap to be reduced while distributing the pressure difference across multiple smaller flow paths, preventing turbulent flow formation. Each partition member creates a separate flow channel that maintains stability even when the overall gap is narrowed.
3Stability of the object's composition
If partition members are inserted between disks, then the disk flutter is reduced by stabilizing the flow, but the device complexity increases
Solution Approach 1:
The invention uses multiple partition members arranged in a radial pattern to segment the gap between the magnetic disk and shroud. This segmentation stabilizes the flow by creating multiple smaller flow paths, reducing disk flutter. The partition members are arranged radially from the center, which is a simple and systematic configuration that minimizes assembly complexity while achieving the desired flow stabilization.
Solution Approach 2:
The partition members serve multiple functions: they stabilize the flow to reduce disk flutter, they distribute the pressure difference across multiple flow paths, and they can be arranged radially to maintain structural simplicity. This multi-functionality reduces the need for additional components, thereby limiting the increase in device complexity.
4Stability of the object's composition
If air is blown to the inner circumference of the disk, then the disk flutter is reduced by eliminating flow instability, but the motor hub or spacer must be processed largely degrading strength and accuracy
Solution Approach 1:
The partition members act as intermediary elements that stabilize the flow without requiring modification of the motor hub or spacer. By inserting partition members between the magnetic disk and shroud, the invention creates multiple flow paths that naturally distribute the pressure difference, eliminating the need for large processing of structural components like the motor hub or spacer.
Solution Approach 2:
Instead of modifying the motor hub or spacer to introduce air, the invention segments the existing gap between the magnetic disk and shroud into multiple smaller gaps using partition members. This segmentation naturally distributes the pressure difference and stabilizes the flow without requiring any processing of the motor hub or spacer, thereby preserving their structural strength and accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces the flow-induced vibration and improves the positioning accuracy of the magnetic head by stabilizing the air flow, without compromising the structural integrity or increasing assembly deformation.
Implementation Method 1
The air between the disks receives a centrifugal force due to the rotation and receives a force to the outer circumferences of the disks
Implementation Method 2
flows 25 directed from the outer circumferences to the inner circumferences are generated near the center between the disks by a pressure difference between the inner circumferences and the outer circumferences of the disks
Implementation Method 3
the flow 24 directed to the outer circumference and the flow 25 to the inner circumference are adjacent to each other in a small gap between the disks, so that strong shearing resistance occurs between them and the flows become unstable and very turbulent
Data Source
AI summary
In a magnetic, disk apparatus, flows around disks are stabilized, flow-induced vibration generated in the disks and a head positioning actuator is reduced, and the positioning accuracy of the head is improved.In a magnetic disk apparatus including plural magnetic disks which are attached to a rotating motor and stacked with a spacer in between and a static structure that surrounds outer circumferences of the magnetic disks, plural current plates supported by the static structure are inserted between a pair of the magnetic disks in a stacking direction of the magnetic disks.