Ribbed Fan Cover Structure for Lightweight Motor Airflow Control
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Solution Overview
Problem
Existing fan covers for self-ventilated rotary electric machines are not optimally designed for efficient air exchange, are not economically efficient in raw material usage, and are complex to assemble and disassemble, lacking geometric and positional stability.
Innovation Solution
A fan cover with a suction region, guiding region, and coupling/exhaust region, featuring a grid structure with ribs of varying cross-sections and arrangements to optimize airflow, reduce weight, and enhance structural integrity, using thermoplastic materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional fan cover designs are used, then structural robustness is achieved, but mass is excessive and material usage is inefficient
Solution Approach 1:
The fan cover is segmented into multiple functional regions (suction region with grid, guiding region, coupling and exhaust region) that can be manufactured as a single integrated piece with optimized material distribution. The grid structure within the suction region provides structural reinforcement where needed while maintaining overall lightweight construction.
Solution Approach 2:
The fan cover employs curved and optimized geometries in its design, particularly in the guiding region and rib structures, which provide structural strength while minimizing material usage. The curved surfaces improve airflow patterns and reduce stress concentrations, allowing for thinner walls and reduced mass.
2Manufacturing precision
If complex manufacturing processes are used, then manufacturing precision is improved, but manufacturing costs increase and assembly becomes more difficult
Solution Approach 1:
Multiple features that would traditionally require separate manufacturing steps (grid structure, ribs, coupling elements, exhaust regions) are merged into a single integrated fan cover component. This allows for one-step manufacturing processes while maintaining high geometric precision through optimized mold design and material flow control.
Solution Approach 2:
The design utilizes parameter optimization in the grid structure (opening sizes, rib thicknesses, spacing) and coupling element geometries that can be directly controlled during molding processes. These parameter changes achieve the required precision without complex post-manufacturing operations.
3Stability of the object's composition
If heavy-duty materials are used, then structural stability is improved, but material usage efficiency decreases and manufacturing costs increase
Solution Approach 1:
The fan cover implements local quality optimization by varying wall thicknesses, rib densities, and material distribution according to specific functional requirements. High-strength features are concentrated in critical areas (coupling regions, grid supports) while lighter construction is used in non-critical areas, achieving structural stability with minimal material usage.
4Manufacturing precision
If additional tools or devices are used for assembly, then assembly precision is improved, but assembly complexity and time increase
Solution Approach 1:
The fan cover incorporates self-aligning and self-locking coupling elements that automatically position and secure the cover to the motor housing without requiring external tools or devices. The coupling elements are designed to self-adjust during assembly, ensuring precise positioning while simplifying the assembly process.
Data Source
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AI summary
The present invention relates to a fan cover (100) comprising a suction region (110) with a grid (101) comprising a central region (102) and a perimeter region (103), wherein at least one first rib (111) and/or at least one second rib (112) and/or at least one third rib (113) and at least one radial rib (114) are arranged between these regions (102, 103), wherein the radial rib (114) is preferably an annular rib with an L- or U-shaped, preferably L-shaped cross-section, and which connects to at least one of the first and/or second and/or third ribs (111, 112, 113). The present invention also relates to a rotor and a corresponding rotary electric machine (200).