Rotating Disk Spoiler Wing Design for Vibration Control
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Solution Overview
Problem
Magnetic disk drives face challenges in reducing windage vibration and dust ingress due to airflow-generated negative pressure, which degrades positioning accuracy and can damage the magnetic head and disk.
Innovation Solution
A spoiler with wings extending from the outer circumference of the magnetic disk towards the spindle shaft, optimized to reduce airflow resistance and negative pressure, combined with a filter to capture dust, and an air introducing guide to manage airflow, effectively reducing windage vibration and dust ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a spoiler is provided to reduce windage vibration by weakening airflow, then positioning accuracy is improved, but negative pressure is generated causing dust to flow towards the spindle shaft
Solution Approach 1:
An air introducing guide is introduced as an intermediary component between the spoiler and the head stack assembly. This guide directs airflow from the upstream side to the downstream side of the spoiler, preventing dust-laden air from the outer periphery from flowing towards the spindle shaft, while maintaining the spoiler's windage reduction effect
Solution Approach 2:
The air introducing guide is divided into multiple guides arranged at different positions around the spoiler. Each guide independently manages airflow in its specific region, allowing precise control of airflow patterns to prevent dust ingress while maintaining effective windage vibration reduction
2Measurement precision
If the wing width of the spoiler is increased to reduce windage vibration more effectively, then positioning accuracy is improved, but negative pressure increases causing more dust to be drawn in
Solution Approach 1:
The air introducing guide acts as a mediator that compensates for the increased negative pressure effect. By providing a controlled airflow path, it prevents dust from being drawn into the negative pressure zone, allowing the use of wider wings for better windage reduction without increasing dust ingress
3Measurement precision
If the spoiler is positioned closer to the head stack assembly to maximize windage reduction, then positioning accuracy is improved, but dust flow towards the assembly increases
Solution Approach 1:
The air introducing guide is positioned between the spoiler and the head stack assembly, creating a protected airflow channel. This intermediary structure allows the spoiler to be positioned optimally for windage reduction while the guide prevents dust from reaching the head stack assembly
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
The solution effectively reduces windage vibration and dust ingress, maintaining positioning accuracy and preventing damage to the magnetic head and disk, while minimizing negative pressure and dust accumulation.
Implementation Method 1
the airflow on the surface forms the air bearing, and provides ascending force to the air bearing surface of the slider
Implementation Method 2
the pressure in the downstream side of the wing is lowered to cause negative pressure
Implementation Method 3
the airflow on the surface forms the air bearing, and provides ascending force to the air bearing surface of the slider, thereby lifting the slider slightly from the surface of the magnetic disk
Implementation Method 4
The voice coil is disposed in the magnetic field formed by a voice coil magnet and a voice coil yoke, and the voice coil magnet, the voice coil yoke, and the voice coil form a voice coil motor (VCM) generating a driving force for rotating the carriage
Data Source
AI summary
Embodiments of the present invention effectively control utilizing a spoiler, the windage vibration of a magnetic head caused by the airflow generated in accordance with rotation of a magnetic disk, while reducing the dust flowing in on the downstream side of the spoiler. According to one embodiment, a spoiler is provided with wings facing a plurality of magnetic disks and a supporting section for the wings is disposed on the upstream side of a head stack assembly in the airflow direction in accordance with the rotation of the magnetic disks. Further, the wings each extend in a direction from the outer circumferences of the magnetic disks towards the spindle shaft while reducing the width of the wing, and is formed to have the width of the wing in a range of 2.7% through 2.9% of the circumferential length of the magnetic disks in a range of two thirds of the length of the wing in a direction towards the spindle shaft from a region located at the outer circumferences of the magnetic disks.