Actuator Arm Chamfer for Disk Flutter Suppression
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Solution Overview
Problem
In magnetic disk drives, the increasing recording density and rotational speed lead to significant oscillation and flutter of actuator arms and magnetic disks due to air flow, causing inaccuracies in head positioning and servo control, which existing techniques such as tapering the actuator arm or using guide members do not adequately address.
Innovation Solution
The actuator arms are designed with slant or chamfered faces on their windward sides to reduce air flow impact, and the slant faces are strategically positioned to balance pressure on the magnetic disks, preventing both actuator arm and disk flutter, while maintaining machining ease and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the actuator arm is tapered on its leeward side to diminish eddy formation, then actuator arm oscillation is suppressed, but the tapering increases machining complexity and may compromise structural integrity
Solution Approach 1:
The actuator arm is designed with asymmetric geometry, specifically tapered on its leeward side, to diminish eddy formation and suppress oscillation. The asymmetric shape creates a streamlined profile that reduces air flow turbulence while maintaining structural integrity through optimized material distribution.
Solution Approach 2:
The actuator arm geometry is modified by changing key parameters such as the taper ratio, chamfer angles, and transition curve radii. These parameter optimizations balance the competing requirements of oscillation suppression and ease of manufacture, allowing standard machining processes to produce the complex asymmetric shape.
2Stability of the object's composition
If guide members are attached to actuator arm sides to reduce air flow influence, then actuator arm flutter is suppressed, but device complexity increases
Solution Approach 1:
The flutter suppression function is merged into the actuator arm structure itself through integrated asymmetric shaping and chamfer features. This eliminates the need for separate guide members while achieving the same aerodynamic stabilization effect, thereby reducing device complexity.
Solution Approach 2:
The unnecessary guide members are extracted from the system by incorporating their flutter suppression function directly into the actuator arm geometry. The asymmetric shape and chamfer features perform the guide member's aerodynamic function without requiring additional components.
3Measurement precision
If slant faces are formed on actuator arms to suppress flutter, then head positioning accuracy is improved, but manufacturing precision requirements increase
Solution Approach 1:
Slant faces are formed only at specific critical locations on the actuator arm where air flow impact is most severe, rather than across the entire structure. This localized approach suppresses flutter and improves positioning accuracy while minimizing the total surface area requiring high-precision machining.
Solution Approach 2:
The slant faces are designed with optimized curvature radii and transition zones that smooth air flow transitions. These curved transitions reduce turbulence and flutter while being manufacturable with standard precision machining capabilities, balancing positioning accuracy with manufacturing feasibility.
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 design effectively suppresses actuator arm flutter and prevents it from causing disk flutter, thereby improving head positioning accuracy and reducing servo control deviations, even with multiple stacked disks.
Implementation Method 1
an air flow created on a recording surface of a rotating magnetic disk strikes against an actuator arm
Implementation Method 2
a pressure variation is given to the magnetic disk, causing flutter of the disk
Data Source
AI summary
A carriage assembly capable of suppressing flutter of actuator arms and magnetic disk is to be provided. In one embodiment, the carriage assembly comprises a first actuator arm having a windward side face, a leeward side face, an outer surface and an inner surface, and a second actuator arm having a windward side face, a leeward side face, a first inner surface opposed to the inner surface of the first actuator arm and a second inner surface positioned on the side opposite to the first inner surface. The first actuator arm is formed with a slant face extending from the windward side face toward the inner surface and the second actuator arm is formed with a slant face extending from the windward side face toward the first inner surface and a slant face extending from the windward side face toward the second inner surface.