Vehicle Traction Motor Terminal Unit Insulation Design
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Solution Overview
Problem
Conventional terminal units of traction motors face issues with reduced insulation and durability due to the generation of foreign substances during the assembly process of bus bars, which leads to empty spaces between spacers and compromised insulation.
Innovation Solution
The terminal unit design features annular bus bars and spacers with radially bent portions and adjustable four-piece structures, positioned alternately within the terminal mold, fixed using an overmold or resin, to minimize foreign substance generation and ensure secure insulation and support between bus bars.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If spacers are press-fitted to maintain distances between bus bars, then the structural arrangement is achieved, but foreign substances are generated on the plating of the bus bars reducing insulation and durability
Solution Approach 1:
A support structure is introduced as an intermediary component between the spacers and bus bars. This support structure receives the spacers and provides a stable mounting base, preventing direct contact between spacers and bus bar plating that generates foreign substances. The support structure acts as a mediator that maintains the required structural arrangement while eliminating the harmful interaction between spacers and bus bar surfaces.
2Reliability
If spacers are assembled as partition walls, then insulation is provided, but empty spaces remain between spacers allowing foreign substance contamination
Solution Approach 1:
The support structure merges multiple functions into a single integrated component: it provides structural support for the spacers, fills the empty spaces between spacers, and creates a continuous protective barrier. By combining the support function and space-filling function into one unified structure, the design eliminates empty spaces where foreign substances could accumulate while maintaining insulation performance.
3Ease of manufacture
If conventional press-fitting process is used, then assembly is achieved, but the process generates foreign substances that compromise insulation
Solution Approach 1:
The support structure is prepared in advance as a pre-assembled unit with spacers already mounted on it. This preliminary assembly allows the bus bars to be simply placed onto the pre-prepared support structure with spacers, eliminating the need for press-fitting operations. The preliminary preparation of the support structure with spacers ensures that no foreign substances are generated during the final assembly process, while maintaining ease of manufacture through simplified assembly steps.
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 design enhances insulation and durability by eliminating empty spaces and reducing foreign substance impact, while also improving vibration and shock resistance through secure component fixation.
Implementation Method 1
the plurality of bus bars and the plurality of insulation spacers may be fixed to the terminal mold by resin
Data Source
AI summary
A terminal unit of a vehicle traction motor includes a terminal mold, bus bars which are assembled and fixed in within the terminal mold, and insulation spacers which are alternately and sequentially inserted and assembled between the bus bars and have different diameters from each other.