Annular Core Piece Recess Design for Lamination Deformation Prevention
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Solution Overview
Problem
The annular core pieces in rotating electric machines become deformed during lamination due to low rigidity, and the presence of multiple recesses on the outer circumference reduces shrink-fitting pressure, leading to decreased holding force and efficiency.
Innovation Solution
An annular core piece design with recesses featuring a bottleneck and raised parts, where the bottleneck is narrower than the bottom region, allowing engagement with the laminating die to prevent deformation and serving as a weld joint, reducing the number of recesses needed on the outer circumference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple recesses are provided on the outer circumstance of the annular core piece for engagement and welding, then deformation is prevented and welding is enabled, but the number of recesses increases causing reduced shrink-fitting pressure distribution and decreased holding force
Solution Approach 1:
The recess is designed to serve dual functions: the bottleneck part engages with the laminating die protrusion to prevent deformation, while the raised part provides a welding surface for joining adjacent core pieces. This multi-functionality reduces the total number of recesses needed on the outer circumstance.
Solution Approach 2:
The invention merges the engagement function (preventing deformation) and welding function into a single recess structure. Previously, separate recesses were needed for each function, but now both functions are integrated into one recess with distinct functional zones (bottleneck and raised part).
2Reliability
If multiple recesses are provided on the outer circumstance of the annular core piece, then deformation is prevented and welding is enabled, but shrink-fitting pressure distribution is reduced leading to decreased holding force
Solution Approach 1:
The recess serves dual purposes (engagement and welding) in a single location, reducing the total number of recesses. This allows shrink-fitting pressure to be distributed more effectively across the outer circumstance while still providing adequate engagement and welding functionality.
3Volume of moving object
If the annular core piece becomes thinner and larger in diameter, then the size requirements are met, but rigidity decreases causing deformation during lamination
Solution Approach 1:
The bottleneck part of the recess engages with the protrusion of the laminating die before the actual lamination process, preventing deformation in advance. This preliminary constraint counteracts the tendency of the thin, large-diameter core piece to deform under subsequent loading.
Solution Approach 2:
The recess with bottleneck and raised part provides localized structural reinforcement at specific points on the outer circumstance. This local feature increases rigidity where needed without requiring the entire core piece to be thicker, thus maintaining the overall thin and large design.
Data Source
AI summary
An annular core piece in which an annular core piece can be received inside a contour of an outer circumstance of the annular core piece and the number of recesses formed on the outer circumstance is small is provided. In an annular core piece including a plurality of recesses opened in an outer circumferential part, the recess includes a narrowed part and a raised part, and a transverse width of the narrowed part is made narrower than a transverse width of a different region present on a side of a bottom of the recess further beyond the narrowed part, and the raised part is formed such that a part of the bottom of the recess is raised and projected toward an opening end of the recess.