Magnetic Disk Stator Base Cutout for Head Interference
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Solution Overview
Problem
Magnetic disk apparatuses face challenges in reducing thickness while maintaining recording capacity and preventing prolonged spindle motor starting times due to interference between the magnetic head and stator coil, which limits the narrowing of the gap between the motor coils and the magnetic disk medium.
Innovation Solution
The magnetic disk apparatus features a motor coil assembly with a stator base shape that has a cut-out portion corresponding to the moving locus of the magnetic head assembly, allowing for equal circumferential intervals of motor coils around the spindle motor rotation body, thereby preventing interference and enabling a thinner design without compromising recording capacity or spindle motor performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the gap between the motor coils and the magnetic disk medium is narrowed to make the apparatus thinner, then the thickness of the apparatus is reduced, but the recording capacity is reduced and the starting time of the spindle motor is prolonged
Solution Approach 1:
The stator base is segmented by cutting out the portion corresponding to the moving locus of the magnetic head assembly. This segmentation allows the motor coils to be arranged only in the remaining areas, creating space for the head to access the inner circumference tracks without interfering with the coil structure, thus resolving the contradiction between thinness and recording capacity
Solution Approach 2:
The design transitions from a conventional circular stator base to an asymmetric shape with a cut-out portion. This dimensional change in the stator base geometry allows the magnetic head to move into the gap between the magnetic disk medium and stator base, enabling access to inner circumference tracks while maintaining a thinner overall apparatus structure
2Length of moving object
If the mounting volume of the motor coils is reduced to make the apparatus thinner, then the thickness is reduced, but the driving ability is reduced and starting time is prolonged
Solution Approach 1:
The stator base is designed with non-uniform local quality by cutting out specific portions corresponding to the magnetic head's moving locus. This allows motor coils to be concentrated in areas that do not interfere with head movement, optimizing both the driving ability in the available space and the thinness of the apparatus
Solution Approach 2:
By segmenting the stator base and removing the interfering portion, the motor coils can be optimally arranged in the remaining space. This segmentation ensures that the coils are positioned to maximize driving ability within the constrained volume while allowing the apparatus to be thinner
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 allows for a thinner magnetic disk apparatus with maintained recording capacity and efficient spindle motor operation, ensuring stable rotational drive and reduced starting times by optimizing the arrangement of motor coils and the stator base shape.
Implementation Method 1
motor coils arranged on a circumference around a rotation center of the spindle motor rotation body so that intervals in the circumferential direction are equal
Implementation Method 2
a magnetic head assembly which has a magnetic head for reading and writing data on the magnetic recording medium
Data Source
AI summary
An embodiment of a magnetic disk apparatus in accordance with the present invention includes a magnetic recording medium, a magnetic head assembly having a magnetic head which reads and writes data on the magnetic recording medium, and a motor coil assembly rotationally driving a spindle motor rotation body, in which plural motor coils are arranged on a circumference around the rotation center of the spindle motor rotation body so that intervals in the circumferential direction are equal, in a stator base surrounding a periphery of the spindle motor rotation body and having a shape in which a prescribed moving locus portion of at least the magnetic head assembly is cut out.