Spindle Motor Wire Routing for Axial Miniaturization
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Solution Overview
Problem
The existing spindle motor designs face challenges in reducing the axial dimension while maintaining a sufficient axial dimension of the hub to support multiple disks, due to the arrangement of solders under the disk or hub, which hinders further miniaturization and increased disk capacity.
Innovation Solution
The design includes a base with a first and second annular portion, where the second annular portion has a reduced axial thickness, and conducting wires are soldered to land portions radially inward of the through holes, allowing for a reduced axial motor dimension while ensuring a sufficient hub dimension, and the circuit board is positioned on the lower surface of the base with land portions radially inward of the through holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conducting wires are soldered to the circuit board at positions radially outward of the through hole, then the soldering space is secured, but the axial dimension of the motor increases and the hub axial dimension cannot be sufficient
Solution Approach 1:
The patent inverts the conventional soldering arrangement by positioning land portions radially inward of the through hole instead of radially outward. This inversion allows the conducting wire to be soldered at a location that does not increase the motor's axial dimension, thereby resolving the contradiction between securing soldering space and reducing overall motor size.
Solution Approach 2:
The patent changes the radial position dimension of the land portion relative to the through hole. By moving the land portion from a radially outward position to a radially inward position, the design utilizes the radial dimension more efficiently, allowing soldering space to be secured without compromising the axial dimension of the motor.
2Reliability
If the second annular portion has the same axial thickness as the first annular portion, then the base structure is simplified, but the hub axial dimension cannot be sufficient for supporting multiple disks
Solution Approach 1:
The patent applies local quality by making the second annular portion have a different axial thickness than the first annular portion. Specifically, the second annular portion has a smaller axial thickness, which allows the hub to have sufficient axial dimension for supporting multiple disks while maintaining a compact overall base structure. This localized variation in thickness optimizes both support capability and structural efficiency.
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 enables a more compact spindle motor design, allowing for a greater number of disks to be supported while maintaining the necessary axial dimension, thus addressing the challenge of miniaturization and increased disk capacity.
Implementation Method 1
A conducting wire drawn out from the stator is arranged to pass through the through hole, and is soldered to a corresponding one of the at least one land portion
Data Source
AI summary
This motor includes a base and a circuit board arranged on a lower surface of the base. The base includes a first annular portion and a second annular portion. The first annular portion is arranged under a stator. The second annular portion is arranged under a flange portion of a hub. A conducting wire drawn out from the stator is arranged to pass through a through hole defined in the first annular portion, and is soldered to a land portion of the circuit board. The second annular portion is arranged to have an axial thickness smaller than that of the first annular portion. The land portion is arranged radially inward of the through hole. The above arrangement makes it easier to achieve a reduced axial dimension of the motor while ensuring a sufficient axial dimension of the hub, which is arranged axially above the second annular portion.