Deep-Drawn Motor Housing Flange for Thin-Wall Rigidity
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Solution Overview
Problem
Electric motors with deep-drawn housings face challenges in achieving mechanical rigidity due to internal and external forces, particularly during strong acceleration, which can lead to deformation or deflection of the motor housing.
Innovation Solution
The motor housing design incorporates a flange with polygonal cross-section and embossments that serve as support surfaces for the busbar assembly, enhancing mechanical stability and providing defined fastening points, thereby reducing bending stress and ensuring high mechanical stiffness even with low material thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If a deep-drawn motor housing is used, then the housing can be manufactured with low material thickness, but the mechanical rigidity and stability deteriorate under internal and external forces
Solution Approach 1:
The patent applies local quality by adding embossments specifically at the flange corners where mechanical stress is highest. These localized structural enhancements provide additional rigidity and stability exactly where needed, rather than uniformly thickening the entire housing. The embossments create local reinforcement zones that resist deformation under internal and external forces while maintaining overall thin-wall construction.
Solution Approach 2:
The embossments introduce a new dimensional feature to the flange structure by creating raised or recessed areas that add structural complexity in the radial direction. This dimensional change transforms the flat flange surface into a multi-level structure that provides both mechanical reinforcement and mounting surfaces for busbar assemblies, effectively solving the rigidity problem without adding material thickness.
2Ease of manufacture
If the flange structure is simplified for easy manufacture, then manufacturing complexity is reduced, but mechanical stability and torque resistance deteriorate
Solution Approach 1:
The flange is segmented into distinct functional zones through the embossments, with each flange corner containing two separate embossments that create individual support surfaces. This segmentation allows the structure to be manufactured using standard deep-drawing processes while creating localized reinforcement zones. The segmented design maintains manufacturing simplicity by using forming operations rather than requiring complex assembly steps.
Solution Approach 2:
The embossments are formed as integral features during the deep-drawing manufacturing process itself, rather than being added as separate components afterward. This preliminary action incorporates the reinforcement structures into the housing formation step, maintaining ease of manufacture while achieving the desired mechanical stability. The embossments are pre-formed along with the housing body, eliminating additional manufacturing steps.
3Strength
If additional fastening points are added to the flange, then mechanical rigidity improves, but device complexity increases
Solution Approach 1:
The embossments serve multiple functions simultaneously: they provide mechanical reinforcement to increase rigidity, create flat support surfaces for mounting busbar assemblies, and offer screw-on points for fastening. This multi-functionality eliminates the need for separate reinforcement ribs or additional mounting features, as the embossments fulfill all these roles in a single integrated structure, thereby avoiding increased device complexity.
Solution Approach 2:
The patent merges the reinforcement function and the mounting function into a single structural feature. The embossments combine the role of structural stiffeners with the role of mounting surfaces, eliminating the need for separate components. This merging reduces overall structural complexity by consolidating multiple functions into one integrated feature rather than requiring multiple separate elements.
Data Source
AI summary
An electric motor with a deep-drawn motor housing including a flange adjoining an opening, the flange being polygonal or substantially polygonal in cross section with flange corners each including a screw-on point, each of the flange corners includes two embossments which define a bending edge of the motor housing between the screw-on point and an opening of the motor housing.