Double Bend VCM Yoke for Tape Drive Density
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Solution Overview
Problem
There is a need for an improved voice coil motor (VCM) yoke for data storage devices to accommodate changing space allocations without increasing the footprint, as existing solutions fail to efficiently optimize component placement and magnetic field distribution for enhanced data storage density.
Innovation Solution
A VCM yoke with a unitary body forming a 'C' shape, featuring a conductive backbone with perpendicular and parallel arm portions, and strategically positioned magnets to facilitate efficient magnetic interaction and actuation, allowing for flexible coupling to an actuator block through openings, thereby optimizing space usage and magnetic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the VCM yoke uses a traditional structure, then the footprint is maintained, but the data storage density cannot be increased
Solution Approach 1:
The VCM yoke is transformed from a conventional linear or simple geometric shape into a spiral configuration. This spiral arrangement effectively utilizes two-dimensional space within the yoke structure, allowing magnets to be positioned in a compact spiral pattern rather than a linear array. This dimensional reorganization enables more magnets to be accommodated within the same footprint, thereby increasing data storage density without expanding the overall device area.
Solution Approach 2:
The spiral VCM yoke structure implements a nested arrangement where magnets are positioned in concentric spiral patterns within the yoke. This nesting approach allows multiple layers of magnetic elements to be packed into the available space, similar to how nested dolls occupy space efficiently. The spiral geometry creates nested zones that maximize the utilization of the yoke's internal volume, enabling higher storage capacity within the same external dimensions.
2Quantity of substance
If the VCM yoke structure is modified to increase storage density, then data storage capacity improves, but the magnetic field distribution may be compromised
Solution Approach 1:
The spiral VCM yoke structure implements local quality optimization by strategically positioning magnets at specific radial and angular positions within the spiral configuration. Different zones of the spiral can accommodate magnets with varying orientations and polarities tailored to local field requirements. This localized customization of magnetic element placement ensures that the magnetic field distribution remains stable and controlled throughout the storage medium, even as the overall storage density increases through the spiral arrangement.
Solution Approach 2:
The spiral VCM yoke structure enables parameter changes in the magnetic field configuration by varying the spiral pitch, radius, and magnet orientation angles along the spiral path. These parameter variations allow optimization of the magnetic field strength and uniformity at different radial distances from the center. By adjusting these geometric parameters, the system maintains stable magnetic field distribution across the storage medium while accommodating higher magnet densities through the spiral geometry.
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 enables efficient movement and positioning of tape heads in tape drives, enhancing data storage density by effectively utilizing the available space and maintaining magnetic performance, thus addressing the challenge of increasing storage capacity without enlarging the device's footprint.
Implementation Method 1
VCMs are the simplest type of electric motors and typically comprise two parts, a magnetic housing and a coil. Applying a voltage across the terminals of the VCM causes the motor to move.
Implementation Method 2
Tape drives operate by using a tape head to record and read back information from tapes by magnetic processes.
Data Source
AI summary
The present disclosure generally relates to a voice coil motor (VCM) yoke for a data storage device. The VCM yoke has a unitary body turned back on itself at opposite ends to form a “C” shape. The unitary body is electrically conductive. The body has a substantially flat inner surface upon which the coil is disposed. The unitary body also has a substantially flat top and a substantially flat bottom surface. A coil is disposed within the turns of the unitary body. The VCM yoke can be coupled to an actuator block using one or more fastening mechanisms that extend through openings in the VCM yoke.