Integral Retainer Tabs for Spindle Motor Wire Routing
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Solution Overview
Problem
Current micro-drive spindle motors face challenges in reducing height while optimizing motor design, as existing cross-over wire routing strategies often require additional hardware, increase complexity, and limit flexibility in winding layer configurations, leading to trade-offs between motor performance and size constraints.
Innovation Solution
The integration of radially disposed retaining tabs on the base plate of the motor housing allows for flexible routing of cross-over wires, eliminating the need for additional hardware and enabling odd or even number of stator coil layers, thereby optimizing motor design and reducing stator height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional cross-over wire routing methods are used, then wires can be routed between stator teeth, but additional hardware is required which increases device complexity and height
Solution Approach 1:
The base plate is modified to include integrated retaining tabs that combine the functions of structural support and wire retention. The retaining tabs are formed as integral parts of the base plate, eliminating the need for separate retention hardware and reducing overall device complexity while maintaining wire routing flexibility
Solution Approach 2:
The base plate serves multiple functions: it provides structural support for the stator assembly, acts as a retention mechanism for cross-over wires through integrated tabs, and facilitates heat dissipation. This multi-functional design eliminates the need for dedicated wire retention hardware, reducing device complexity
2Ease of operation
If wires exit at the proximate end of each tooth, then routing is simplified, but the number of winding layers must be even which limits design flexibility
Solution Approach 1:
The retaining tabs act as intermediary structures that receive wires from either the proximate or distal ends of stator teeth. These tabs provide intermediate retention points that allow wires to be routed flexibly, enabling both even and odd winding layer configurations while maintaining routing simplicity through standardized tab interfaces
Solution Approach 2:
The retaining tabs extend radially outward from the base plate, creating an additional dimensional space for wire retention. This radial extension provides alternative wire routing paths that are not constrained by the tooth end positions, allowing designers to choose between even and odd winding layers based on performance requirements
3Length of moving object
If stator height is reduced by altering windings, then motor height profile is improved, but flexibility in winding layer numbers is constrained
Solution Approach 1:
The retaining tab structure provides a dynamic adaptation mechanism that accommodates different winding layer configurations. The tabs can retain wires regardless of whether the winding layers are even or odd, allowing the stator height to be optimized for different motor performance requirements without being constrained by fixed winding rules
Solution Approach 2:
The invention enables parameter changes in winding layer numbers (even or odd) while maintaining consistent wire retention through the standardized retaining tabs. This allows designers to adjust winding parameters to optimize stator height and motor performance independently, as the tab structure adapts to different winding configurations rather than constraining them
Data Source
AI summary
A base plate for magnetic disk drives is provided that includes a hooked protrusion integrated therein between adjacent spindle motor coils. The cross-over wires that span between adjacent coils are secured by the hooked protrusions, thereby optimizing coil height and reducing manufacturing steps. The hook-like protrusions of one embodiment of the present invention are preferably stamped into the base plate.