Spindle Motor Insulation Sheet for Lead Wire Protection
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Solution Overview
Problem
In spindle motor designs, lead wires passing through base draw-out holes can damage their insulating coating due to contact with the hole edges, leading to potential short circuits and defective insulation.
Innovation Solution
A spindle motor design that includes an insulation sheet portion with a thickness greater than the land portion, covering the base portion through hole, which reduces the likelihood of lead wire contact with the hole's inner wall surface, thereby preventing damage to the insulating coating and potential short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lead wire passes through the base draw-out hole, then the electrical connection is established, but the insulating coating of the lead wire may be damaged due to contact with the hole edge
Solution Approach 1:
An insulation sheet is introduced as an intermediary component between the lead wire and the base draw-out hole. The insulation sheet covers the inner wall surface of the draw-out hole, preventing direct contact between the lead wire and the hole edge, thus protecting the insulating coating while maintaining electrical connectivity through the lead wire to the wiring member
Solution Approach 2:
The insulation sheet is installed beforehand to cover and protect the vulnerable insulating coating of the lead wire before the lead wire is inserted through the base draw-out hole. This preventive measure ensures that the insulating coating is not damaged during the assembly process or subsequent operations
Data Source
AI summary
A base portion of a spindle motor includes a base portion through hole passing therethrough from an upper surface to a lower surface thereof. Coils include a lead wire drawn out from above the upper surface downwardly from the lower surface through the base portion through hole. A circuit board includes a land portion to which the lead wire is connected. The spindle motor includes an insulation sheet portion configured to cover at least a portion of the base portion through hole and with which the lead wire is arranged to be in contact. A thickness of the insulation sheet portion is greater than a thickness of the land portion.