Active Fiber Composite Suspension for High-Density HDD Actuation
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Solution Overview
Problem
Conventional data storage device suspensions in hard disk drives face challenges in achieving high data density and precision due to limitations in actuation sensitivity and resolution, particularly in environments with narrow and closely spaced data tracks.
Innovation Solution
The use of an active fiber composite spanning a portion of the loadbeam in the head-gimbal assembly, which includes interdigitized electrodes and piezoelectric active fibers, allows for simultaneous actuation and sensing, enhancing the suspension's sensitivity and resolution by enabling active damping and vibration suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional metal-based suspensions are used, then structural strength and stability are maintained, but actuation sensitivity and resolution are limited
Solution Approach 1:
The suspension employs an active fiber composite structure combining piezoelectric fibers embedded in a polymer matrix. This composite material provides both the required structural strength and enhanced actuation sensitivity through piezoelectric effects, resolving the contradiction between strength and measurement precision.
Solution Approach 2:
The invention changes the material parameters by using piezoelectric fibers with specific electrical and mechanical properties. The piezoelectric coefficient and other material parameters are optimized to achieve high actuation sensitivity while maintaining structural integrity, overcoming the limitations of conventional metal suspensions.
2Productivity
If conventional suspensions are used, then manufacturing simplicity is maintained, but servo bandwidth and tracking performance are limited
Solution Approach 1:
The suspension merges actuation and sensing functions into a single integrated active fiber composite structure. The piezoelectric fibers serve both as actuators for positioning and as sensors for feedback, enabling high servo bandwidth without requiring separate actuation and sensing systems, thus managing device complexity.
Solution Approach 2:
The active fiber composite serves multiple functions simultaneously: structural support, actuation, and sensing. This multi-functionality enables enhanced tracking performance and servo bandwidth while avoiding the need for additional separate components that would increase device complexity.
3Measurement precision
If active fiber composite is used, then actuation sensitivity and resolution are improved, but manufacturing complexity increases
Solution Approach 1:
The active fiber composite is segmented into discrete piezoelectric fibers embedded in a polymer matrix, allowing for modular manufacturing. The fibers can be produced separately and then integrated into the suspension structure, simplifying the manufacturing process while maintaining high tracking resolution.
Solution Approach 2:
The invention optimizes material parameters such as fiber orientation, fiber diameter, and polymer matrix composition to achieve the desired tracking resolution. By carefully controlling these parameters during manufacturing, high precision is achieved without excessive manufacturing complexity.
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 configuration improves the material properties of the suspension, enabling increased servo bandwidth, improved tracking performance, and higher recording areal density, while maintaining similar mass and stiffness to traditional metal-based suspensions.
Implementation Method 1
The suspension includes an active fiber composite that spans a portion of a loadbeam and is configured with at least one active fiber contacting a supporting layer
Data Source
AI summary
A data storage device may employ a suspension that positions a transducing head proximal a data storage medium. The suspension can consist of an active fiber composite that spans a portion of a loadbeam. The active fiber composite can be configured with at least one active fiber contacting a supporting layer.