Spindle Motor Sheet Hole Alignment via Thermal Melting
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Solution Overview
Problem
The reduction in size of the through hole of the base plate in spindle motors complicates the proper positioning and sealing of conducting wires, making it difficult to maintain airtightness and prevent contact between the wires and the base plate.
Innovation Solution
A method involving a metallic base member with a base hole and a thermoplastic resin sheet is used, where the sheet is adhered to the base member, and heat is applied to create a continuous sheet hole that aligns with the base hole, allowing conducting wires to pass through while an annular edge portion with increased thickness prevents contact with the base member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the size of the through hole of the base plate is decreased to improve airtightness, then the airtightness is improved, but it becomes more difficult to position the sealing sheet properly and keep conducting wires out of contact with the base plate
Solution Approach 1:
The sheet is adhered to the base portion before the hole definition process. This preliminary positioning ensures that when the hole is later defined through heating, the sheet hole and base hole are already properly aligned, eliminating positioning difficulties associated with small through holes
Solution Approach 2:
Heat is applied to the sheet to locally melt and define the sheet hole. This parameter change (thermal processing) allows the hole to be defined after adhesion, ensuring proper alignment while maintaining the small size needed for airtightness
2Reliability
If the size of the through hole of the base plate is decreased to improve airtightness, then the airtightness is improved, but it becomes difficult to keep conducting wires out of contact with the base plate
Solution Approach 1:
The sheet has non-uniform thickness with an annular edge portion that is thicker than the remaining portion. This local quality variation creates a protective structure that prevents conducting wires from contacting the base plate while maintaining the small hole size for airtightness
Solution Approach 2:
The sheet is adhered to the base portion before hole definition, establishing proper positioning in advance. This ensures that the sheet hole aligns with the base hole, allowing wires to pass through the sheet hole without contacting the base plate
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 method simplifies the alignment and definition of holes, enhances the strength around the sheet hole, and effectively prevents contact between the conducting wires and the base member, improving the airtightness and operational efficiency of the spindle motor.
Implementation Method 1
heat is preferably applied to at least a region of the sheet which coincides with the base hole to define a sheet hole that is continuous with the base hole
Data Source
AI summary
In a method of manufacturing a spindle motor, a sheet preferably made of a thermoplastic resin is closely adhered to an upper surface of a base portion of a spindle motor such that the sheet covers a base hole of the base portion. Next, heat is applied to a region of the sheet which coincides with the base hole to define a sheet hole continuous with the base hole. Thereafter, a coil is arranged over the base portion, and a conducting wire defining the coil is extended through the sheet hole and the base hole to be drawn downwardly out of the base portion. The sheet hole is thus defined after the sheet is closely adhered to the base portion. In addition, the sheet hole is defined by melting the resin through application of the heat. It is therefore easy to arrange the sheet and define the sheet hole.