Bipartite Shell for Rotating Electrical Machine
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Solution Overview
Problem
Conventional rotating electrical machines have a high number of components and complex assembly processes, leading to increased costs, time, and dimensional/geometric interface challenges, particularly in high-power industrial applications, where the gap between the rotor and stator is critical for dynamic performance.
Innovation Solution
A bipartite shell design where the first shell part combines the functions of housing and front cover, and the second shell part combines the functions of housing and rear cover, formed in a single piece, with reduced geometrical/interfaces allowing for radial contact with the stator, eliminating the need for axial stops and simplifying assembly, and incorporating snap-fit elements for secure fastening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional shell design with multiple separate components (central tubular member, front cover, rear cover) is used, then the shell can provide structural enclosure, but the number of components and assembly complexity increases
Solution Approach 1:
The patent combines the central tubular member, front cover, and rear cover into a single integrated shell component formed as one piece. This eliminates the need for multiple separate parts and their associated fastening elements, directly reducing component count while maintaining the structural enclosure function.
Solution Approach 2:
The integrated shell serves multiple functions simultaneously: it provides structural enclosure, acts as a mounting base for the stator, and integrates the feet for mounting the rotating electrical machine. This multi-functionality reduces the need for separate components for each function.
2Strength
If multiple separate shell components are assembled together, then structural enclosure is achieved, but assembly time and production costs increase
Solution Approach 1:
By forming the shell as a single integrated piece rather than assembling multiple components, the patent eliminates assembly steps for joining shell parts. This directly reduces assembly time and production costs while maintaining the required structural enclosure.
3Strength
If conventional multi-component shell design is used, then structural requirements are met, but the number of dimensional/geometric interfaces increases tolerance accumulation
Solution Approach 1:
The patent reduces the number of interfaces by integrating the shell into a single component. This eliminates the dimensional and geometric interfaces that would exist between separate shell parts, thereby reducing tolerance accumulation and improving manufacturing precision.
4Ease of operation
If traditional shell construction with feet attached by screws is used, then mounting functionality is achieved, but assembly process becomes slower
Solution Approach 1:
The patent integrates the feet directly into the shell as integral features rather than separate components requiring screw attachment. This eliminates the screwing operation for mounting the feet, significantly speeding up the assembly process while maintaining the mounting functionality.
Data Source
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AI summary
The invention refers to a shell for a rotating electrical machine, the shell comprising a first shell part (10) and a second shell part (13) configured for coupling. The inner surface of the first and second shell parts (10, 13) is free from elements limiting the displacement of the stator in the axial direction. The first shell part (10) is formed in a single piece, with a cylindrical wall section (11) and an end section (12). The cylindrical wall section (11) comprises at least one terminal box receiving portion (11b), at least two connection element receiving portions (11c) and at least two coupling elements (11c). The second shell part (13) is formed in a single piece, with a cylindrical wall section (14) and an end section (15). The cylindrical section comprises at least two coupling elements (14c), and the end section has a shaft passage central hole.