Stator Core Fixing Structure Axial Ring Member Design
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Solution Overview
Problem
Conventional stator-core fixing structures for rotating electric machines result in increased size, weight, material costs, and complex assembly due to the need for larger housing diameters, screwing spaces, and additional components like liquid packing materials and gaskets, which complicate the assembly process and make the apparatus expensive.
Innovation Solution
A stator-core fixing structure where the ring member is fixed to the cover or housing case without protruding outward, eliminating the need for screwing spaces and liquid packing materials, allowing for direct alignment of rotor and stator centers and reducing the overall diameter, weight, and assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flange portion radially protruding from the outer circumference of the ring member is formed and screwed to the housing case, then the stator core can be fixed to the housing case, but the outer diameter of the screwed portion increases and the thickness of the housing case increases, causing the overall weight to increase
Solution Approach 1:
The ring member is designed to protrude in the axial direction (one dimension) rather than radially outward (another dimension). This dimensional change allows the screwing portion to be positioned inside the housing case without increasing the outer diameter, thereby reducing overall weight while maintaining fixing reliability.
2Reliability
If a flange portion radially protruding from the outer circumference of the ring member is formed and screwed to the housing case, then the stator core can be fixed to the housing case, but the outer diameter of the screwed portion increases
Solution Approach 1:
The ring member protrudes axially (one dimension) instead of radially (another dimension), allowing the screwing operation to occur within the existing outer diameter envelope of the housing case, thus reducing the overall outer diameter while maintaining secure fixing.
3Reliability
If a pedestal portion for screwing is provided in the housing case, then the ring member can be screwed to the housing case, but the thickness of the housing case increases
Solution Approach 1:
The screwing interface is positioned in the axial direction within the existing thickness envelope of the housing case, eliminating the need for additional thickness. The ring member's axial protrusion provides the necessary screwing surface without requiring the housing case to be thicker.
4Reliability
If liquid packing materials or gaskets are provided between the flange portion and the housing case to prevent water or oil intrusion, then sealing is improved, but material costs increase and the assembly becomes complicated
Solution Approach 1:
The patent eliminates the need for separate sealing components (gaskets or liquid packing materials) by integrating the sealing function directly into the screwing interface between the ring member and housing case. The screw connection itself provides the seal, removing additional parts and simplifying assembly.
5Reliability
If the flatness of the flange portion and the degree of parallelism between the top and bottom sides are accurately maintained to prevent water or oil intrusion, then sealing is improved, but cutting processing is required and the apparatus becomes expensive
Solution Approach 1:
The patent removes the requirement for precision cutting processing of a flange portion by eliminating the flange structure entirely. The sealing function is achieved through the screwing interface itself, which does not require high-precision flatness or parallelism, thereby reducing manufacturing costs.
6Device complexity
If a single screw is utilized for both fixing the flange portion to the housing case and fixing the cover member to the housing case, then the structure is simplified, but liquid packing materials or gaskets are required to prevent water or oil intrusion, causing material costs to increase
Solution Approach 1:
The patent eliminates the need for liquid packing materials or gaskets by designing the screwing interface between the ring member and housing case to provide inherent sealing. This allows a single screw to perform both fixing functions without requiring additional sealing materials, reducing material costs while maintaining structural simplicity.
Data Source
AI summary
The objective is to prevent the flange of a ring member for holding the stator core from enlarging the diameter of a rotating electric machine and to eliminate a screwing space and a pedestal portion in the housing case so as to suppress the weight of the rotating electric machine from increasing; one end of the ring member for holding the stator core protrudes from the outer circumference of the stator core toward the rotation axle and the ring member is fixed to the cover or the housing case at the protruding portion.