Segmented Stator Core Fastening Layout for Material Yield and Rigidity
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Solution Overview
Problem
Conventional stator cores for rotating electrical machines face a trade-off between material yield improvement and freedom in designing fastening portions, as increasing the division number or providing thick portions for rigidity limits the design flexibility of fastening portions.
Innovation Solution
A stator core design where core plates are stacked axially with divisional cores arranged circumferentially, featuring fastening portions protruding radially and having fastening holes, and including multiple kinds of divisional cores with fastening portions at different positions, allowing for communication of fastening holes in the stacking direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the division number is increased to improve material yield, then material yield is improved, but the fastening portions near both ends become extremely small and design freedom is lost
Solution Approach 1:
The invention divides the stator core into multiple divisional cores (N≥4) arranged in the circumferential direction, and further segments the fastening portions into multiple types (M≥3) with different positions and configurations. This segmentation allows each divisional core to be optimized independently, enabling high material yield while providing multiple fastening portion designs to maintain design freedom.
Solution Approach 2:
The invention applies different fastening portion configurations to different divisional cores based on local requirements. Fastening portions are provided at different positions (first, second, third positions) with different thicknesses and structures, allowing each region to be optimized for its specific function while maintaining overall material efficiency.
2Strength
If thick portions are provided to ensure rigidity of fastening portions, then rigidity is improved, but the fastening portions near both ends become extremely small and design freedom is lost
Solution Approach 1:
The invention provides thick portions at specific locations within divisional cores where rigidity is required, rather than uniformly thickening all fastening portions. This localized reinforcement maintains design freedom for other fastening portions while ensuring sufficient rigidity where needed.
Solution Approach 2:
By segmenting the fastening portions into multiple types with different characteristics, the invention allows some portions to be thick and rigid while others remain thin and flexible, resolving the contradiction between rigidity requirements and design freedom.
3Loss of substance
If the division number is large, then material yield is improved, but the number and shape of fastening portions cannot be freely designed
Solution Approach 1:
The invention segments both the divisional cores (N≥4) and the fastening portions (M≥3 types) independently, allowing the number of divisional cores to be increased for material yield improvement while simultaneously providing multiple fastening portion configurations to maintain design flexibility and manage complexity.
Solution Approach 2:
The invention introduces the dimensional parameter of fastening portion position (first, second, third positions at different circumferential locations) to create design freedom. By distributing fastening portions across multiple positions and types, the system achieves both high division numbers for material yield and sufficient design freedom.
Data Source
AI summary
Divisional cores include a plurality of kinds of fastening-portion-provided divisional cores of which the fastening portions are provided at a plurality of different positions separated from a center line connecting a rotation center axis of a rotating electrical machine and a circumferential-direction center of each divisional core. The fastening portions of different kinds of the fastening-portion-provided divisional cores are stacked on upper and lower sides in the stacking direction. The core plates are stacked such that contact parts of the divisional cores are located at positions different in the circumferential direction on the upper and lower sides in the stacking direction. The fastening holes of the fastening portions are formed in communication with each other in the stacking direction.