Circuit-Integrated Motor Sealing Structure Against Gap Corrosion
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Solution Overview
Problem
Existing circuit-integrated motors suffer from gap corrosion due to corrosive liquids adhering to gaps between casing parts, which are not adequately addressed by existing technologies.
Innovation Solution
A circuit-integrated motor design with a casing that includes a partition part and a board cover, featuring a seal groove with a controlled liquid gasket flow direction to the outer peripheral side, using an adhesive sealant to seal gaps effectively, and a bulging portion to prevent corrosive liquid adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liquid sealant is filled into a groove and cured to seal a joint surface, then waterproof property is improved, but the sealant may not reach the outermost peripheral portion of the gap, leaving it vulnerable to corrosive liquid adhesion
Solution Approach 1:
The patent inverts the conventional sealing approach by changing the flow direction of the liquid gasket from the inner peripheral side to the outer peripheral side. This is achieved by making the first height (inner peripheral side) greater than the second height (outer peripheral side), allowing the gasket to flow outward and ensure the outermost peripheral portion is adequately sealed against corrosive liquids.
Solution Approach 2:
The patent applies different height dimensions at different locations of the flange portion. The first height at the inner peripheral side is greater than the second height at the outer peripheral side, creating local variations in the groove structure that control the flow direction of the liquid gasket and ensure adequate sealing at the outermost peripheral portion.
2Reliability
If the width dimension L1 of the joint surface on the inner peripheral side is made smaller than L2 on the outer peripheral side, then liquid sealant flow is restricted to the inner peripheral side, but this does not provide sufficient gap corrosion resistance
Solution Approach 1:
The patent inverts the conventional approach by making the first height (inner peripheral side) greater than the second height (outer peripheral side), thereby reversing the flow direction of the liquid gasket from inner-peripheral-restricted to outer-peripheral-directed, ensuring adequate sealing at the outermost peripheral portion for gap corrosion resistance.
3Ease of manufacture
If multiple casing parts are used to form the board chamber, then assembly flexibility is improved, but gaps between parts become vulnerable to corrosive liquid adhesion
Solution Approach 1:
The patent applies a liquid gasket to the flange portion before assembling the board cover to the case body. This preliminary application ensures that the sealing material is in place to prevent corrosive liquid from adhering to the gap between casing parts, addressing the corrosion resistance issue while maintaining assembly flexibility.
Solution Approach 2:
The liquid gasket acts as an intermediary substance between the flange portion and the board cover, filling and sealing the gap between these casing parts. This intermediary layer prevents corrosive liquids from reaching the gap, thereby improving gap corrosion resistance while allowing the multi-part construction to remain.
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
The design significantly improves gap corrosion resistance by ensuring a sufficient adhesive sealant supply to the outermost peripheral portion, preventing corrosive liquid adhesion and enhancing motor reliability.
Implementation Method 1
an adhesive sealant filled into the seal groove of the partition part to seal a gap between the partition part and the board cover
Data Source
AI summary
A circuit-integrated motor includes: a motor; a control board; and a casing including a partition part dividing a board chamber for housing the control board from a placement space for the motor, and a board cover disposed opposite the partition part with the control board interposed therebetween. On an outer peripheral side of the control board, an opposite surface of the partition part includes: a contact region in contact with an outer peripheral edge portion of the board cover; and an outer peripheral region formed with a seal groove recessed from the contact region. The circuit-integrated motor 1 further includes an adhesive sealant filled into the seal groove of the partition part to seal a gap between the partition part and the board cover.