Field Element Core Curved Coupling Stress Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional field element cores experience stress concentration at coupling parts due to rectangular slot divisions, leading to potential deformation, and rounding only the corners does not adequately disperse stress across other parts.
Innovation Solution
The field element core features curved portions on its lateral surfaces, with specific ratios and orientations of field magnet through holes that distribute stress and allow for longer magnet insertion, while maintaining the area of the through holes for magnet fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If corners of coupling part are rounded, then stress concentration at corners is mitigated, but stress concentration in other parts remains
Solution Approach 1:
The invention applies curvature to the entire lateral surface of the coupling part rather than just rounding corners. The lateral surface includes a curved portion that extends along the circumferential direction, creating a smoothly curved surface that eliminates corners and flat portions. This continuous curvature distributes stress evenly across the entire coupling part, preventing stress concentration at any specific location.
2Length of moving object
If field magnet through holes are made longer to insert longer magnets, then magnetic flux distribution improves, but stress concentration increases
Solution Approach 1:
The curved lateral surface design allows the coupling part to accommodate longer field magnets through holes without creating stress concentration. The curvature provides a smoothly varying cross-section that distributes mechanical stress evenly while maintaining the structural integrity needed to support extended magnet lengths for improved magnetic flux distribution.
3Ease of manufacture
If rectangular slots are used for field magnet through holes, then manufacturing is simple, but stress concentration occurs at corners
Solution Approach 1:
The invention replaces rectangular slot shapes with curved lateral surfaces that extend along the circumferential direction. This curved configuration eliminates the corner stress concentration inherent in rectangular designs while maintaining manufacturing feasibility through standard forming processes. The curved portion can be integrated into the core body formation process, balancing manufacturing simplicity with stress distribution.
4Strength
If coupling part has flat portions with rounded corners, then corners are protected, but stress concentration occurs at the transition zones
Solution Approach 1:
The invention eliminates the transition zones between flat portions and rounded corners by providing a continuously curved lateral surface. The curved portion extends smoothly without abrupt changes in geometry, ensuring uniform stress distribution across the entire coupling part surface and preventing stress concentration at any transition location.
Data Source
AI summary
The present invention relates to a field element that mitigates stress concentration in a coupling part. A field element core (1) includes field magnet through holes (41, 42) and coupling part (11). The field magnet through holes (41, 42) are circularly disposed in a peripheral direction (92) around a predetermined direction (91) and are adjacent to each other in the peripheral direction (92) to form a set. The field magnet through holes (41, 42) forming the same pair both extend along a given direction (94) that is defined for each pair, when viewed from the predetermined direction (91). The coupling part 11 is provided between the field magnet through holes (41, 42) forming the same set and has ends (412, 422) as lateral surfaces (111, 112), respectively. The entire lateral surfaces (111, 112) of the coupling part (11) are curved to form a concave shape. Specifically, viewed from the predetermined direction (91), only at a given position (r13) between both ends of the lateral surface (111), a tangent (t(r13)) of the lateral surface (111) extends along an extending direction (93) of the coupling part (11). The same holds true for the lateral surface (112).