Rotary Electric Machine Conductive Track Coplanarity
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Solution Overview
Problem
Existing rotary electric machines with built-in electronic drive modules face challenges in assembly operations due to the placement of conductive tracks on the opposite side of the printed circuit board, leading to complex assembly processes and tolerance issues.
Innovation Solution
Conductive tracks are positioned on the component side of the printed circuit board, with tabs and connecting elements that compensate for height differences, allowing for simplified assembly and improved tolerance matching between tracks and components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive tracks are placed on the opposite side of the printed circuit board, then electrical connections are established, but assembly operations become complex and tolerance issues arise
Solution Approach 1:
The conductive tracks are inverted from the conventional placement on the opposite side of the PCB to being placed on the same side as the electronic components. This inversion eliminates the need for complex assembly operations involving flipping or routing connections through the board, while maintaining reliable electrical connections through the tab-and-seat configuration.
2Ease of manufacture
If conductive tracks are positioned on the component side of the printed circuit board, then assembly operations are simplified, but height differences between tabs and branches must be compensated
Solution Approach 1:
The seat acts as an intermediary element between the tab and the branch, providing a standardized interface that absorbs height differences. The seat is configured with specific dimensional parameters that allow it to compensate for variations in tab height, ensuring proper coplanarity and electrical connection without requiring complex adjustment mechanisms.
3Manufacturing precision
If tabs are housed in seats to ensure coplanarity, then assembly precision is improved, but manufacturing complexity increases
Solution Approach 1:
The seat is designed with optimized dimensional parameters including depth, width, and positioning coordinates that directly control the coplanarity of tabs with the PCB surface. By carefully selecting these parameters, the design achieves precise coplanarity (within acceptable tolerances) while keeping the seat structure simple and manufacturable, avoiding unnecessary complexity.
Data Source
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AI summary
A rotary electric machine comprises an electronic module (5) which comprises a printed circuit board (19) and a plurality of electronic components (6), each of which is provided with respective connecting pins (7) disposed on a component side (20) of the printed circuit board (19); the electronic module (5) comprises at least one conductive track (25) which comprises a plurality of tabs (28), each configured to be connected to a respective connecting pin (7); the conductive track (25) is positioned on the component side (20) of the printed circuit board (19); the printed circuit board (19) has at least one seat (26) configured to house at least a first tab (28a) of the tabs (28) in such a way that the top face (30) of the first tab (28a) is coplanar with the component side (20) of the printed circuit board (19).