Variable-Width Sidewall Ribs for Rigid Motor Cases
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Solution Overview
Problem
The existing rotating electrical machine cases for electric vehicles lack sufficient rigidity and have ribs that do not serve additional functional purposes beyond structural support.
Innovation Solution
A rotating electrical machine case with a cylindrical case body and side wall ribs of varying circumferential widths, where thicker ribs enhance rigidity and can display information related to the machine, such as specifications or product details, eliminating the need for separate display surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ribs of uniform width are provided on the side wall portion, then manufacturing is simplified, but rigidity is insufficient
Solution Approach 1:
The patent applies local quality by providing ribs with different circumferential widths at different locations on the side wall portion. Specifically, ribs having a first circumferential width are provided at a first position, while ribs having a second circumferential width (different from the first) are provided at a second position. This allows each rib to be optimized for its specific location, improving overall rigidity without requiring complete redesign of the entire rib structure.
Solution Approach 2:
The rib structure is segmented into multiple types based on circumferential width. Instead of using a single uniform rib design, the patent divides the ribs into at least two categories (first circumferential width and second circumferential width), allowing differential reinforcement at different positions to achieve optimal rigidity with controlled complexity.
2Loss of information
If additional information display surfaces are added to the case, then information visibility is improved, but device complexity and weight increase
Solution Approach 1:
The patent applies multi-functionality by making the ribs serve dual purposes: structural reinforcement and information display. The ribs are provided with information display portions that can display various information such as specifications, warnings, or operational status. This eliminates the need for separate information display surfaces, reducing overall device complexity while maintaining information visibility.
3Strength
If more ribs are added to improve rigidity, then structural strength increases, but weight increases
Solution Approach 1:
Instead of uniformly increasing rib width throughout the entire side wall portion, the patent applies local quality by providing ribs of different circumferential widths at different positions. This allows structural strength to be improved only where necessary, rather than adding material uniformly across the entire structure, thereby minimizing weight increase while achieving the required rigidity.
Data Source
AI summary
A rotating electrical machine case includes a case body having a cylindrical shape surrounding a rotating electrical machine and a side wall portion provided on at least one end side of the case body in a rotation axis direction. The side wall portion is provided with a plurality of ribs extending in a radial direction when viewed from the rotation axis direction of a rotating electrical machine and the plurality of ribs include ribs having different circumferential widths.