Stator Circuit Board Through-Holes for Dense Insulating Coating
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Solution Overview
Problem
The challenge of efficiently filling the narrow gap between a cover and a circuit board in a stator assembly with a filler to enhance waterproofing and electrical insulation is hindered by the difficulty in pouring the filler from a radial direction, leading to potential gaps that can allow water and substances to enter, compromising insulation properties.
Innovation Solution
A stator design featuring through-holes in the circuit board and cover portion that allow for the coating portion to be applied more efficiently, ensuring complete filling and coverage of the coil portions and circuit board surfaces, with through-holes facilitating the discharge of air and preventing entry of dust and water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If filler is poured from radial direction outward, then filling process is simple, but filling density is low and gaps remain
Solution Approach 1:
The patent inverts the conventional filling approach by pouring filler from the inner circumferential surface of the cover toward the outer circumferential surface, rather than from outer to inner. This reverse filling direction enables the filler to flow along the inner surface of the circuit board, ensuring complete coverage of the narrow gap between the cover and circuit board, thereby achieving both ease of manufacture and high filling density.
2Volume of moving object
If gap between cover and circuit board is narrow, then assembly is compact, but filler cannot be filled properly
Solution Approach 1:
The patent addresses the narrow gap filling difficulty by changing the filling dimension - pouring filler from the inner circumferential surface along the axial direction toward the outer circumferential surface. This dimensional approach allows the filler to flow into and completely fill the narrow radial gap between the cover and circuit board, maintaining compact assembly while enabling proper filler insertion.
3Ease of operation
If filler is poured outward radially, then pouring is easy, but accommodating space cannot be densely filled
Solution Approach 1:
The patent inverts the conventional radial filling direction by pouring filler from the inner circumferential surface toward the outer circumferential surface. This reverse direction allows the filler to flow along the inner surface of the circuit board and completely fill the accommodating space, ensuring maximum filler quantity while maintaining ease of operation through a simple pouring process.
Data Source
AI summary
A stator includes a stator core having an annular shape surrounding a center axis extending in an axial direction, a plurality of coil portions, a circuit board, and a coating portion having electrical insulating properties. The stator core includes a slot. A plurality of the slots extend through the stator core in the axial direction and are arranged in a circumferential direction. The plurality of coil portions are respectively provided in the plurality of slots. The circuit board is on one side of the stator core in the axial direction and electrically connected to a lead wire drawn from the plurality of coil portions. The coating portion coats at least the coil portions. The circuit board includes a first through-hole extending in the axial direction. At least a portion of the first through-hole overlaps the stator core as viewed in the axial direction.