Armature Core Fixation Structure for Circumferential Displacement Control
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Solution Overview
Problem
Conventional rotating electric machines with stator cores fitted by shrink-fitting or press-fitting face issues of displacement in the circumferential direction due to insufficient stress, leading to potential damage when stress is increased to suppress this displacement.
Innovation Solution
A rotating electric machine design featuring an armature core with a circular cylindrical shape, an armature holding member with a circular cylindrical portion, and a regulating portion that engages in the circumferential direction to prevent displacement, allowing for a smaller tightening margin without risking damage to the armature core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the tightening margin is increased to suppress armature core displacement, then the displacement is reduced, but the armature core may be damaged due to excessive stress
Solution Approach 1:
The armature holding member is divided into multiple circumferential portions with regulating portions at different angular positions. Each regulating portion independently suppresses displacement in its specific region, allowing distributed stress control rather than concentrated high stress from a single tight fit.
Solution Approach 2:
Regulating portions are provided at specific local positions (e.g., 0°, 120°, 240°) rather than uniformly across the entire circumference. This localized approach suppresses displacement at critical positions while maintaining a smaller overall tightening margin, preventing excessive stress in non-critical areas.
2Strength
If shrink-fitting or press-fitting is used to fix the armature core, then the armature core is secured, but displacement in the circumferential direction occurs due to insufficient stress
Solution Approach 1:
The fixation function is segmented into multiple regulating portions distributed circumferentially. Each portion provides localized engagement (through protrusions, recesses, or interference fits) that collectively prevents circumferential displacement more effectively than a single uniform fit.
Solution Approach 2:
The armature holding member and armature core have asymmetric features (protrusions, recesses, or non-uniform clearance) at the regulating portions. This asymmetric design creates directional engagement that specifically resists circumferential displacement while allowing radial assembly with a smaller tightening margin.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively suppresses armature core displacement in the circumferential direction while maintaining a reduced tightening margin, preventing damage and ensuring stable operation.
Implementation Method 1
The armature core and the circular cylindrical portion are fitted and fixed by shrink-fitting or press-fitting with a predetermined tightening margin
Implementation Method 2
The armature core and the circular cylindrical portion are fitted and fixed by shrink-fitting or press-fitting with a predetermined tightening margin
Data Source
AI summary
A rotating electric machine includes a field element having a plurality of magnetic poles of which polarities alternate in a circumferential direction, and an armature including an armature winding of multiple phases and an armature core having a circular cylindrical shape. The armature core is provided integrally with the armature winding. The field element and the armature are provided to oppose each other in a radial direction. An armature holding member includes a circular cylindrical portion assembled on an inner side in the radial direction of the armature core. The armature core and the circular cylindrical portion are fitted and fixed to each other with a predetermined tightening margin. A regulating portion regulates displacement in the circumferential direction of the armature core by engagement in the circumferential direction, and is provided in portions of the armature core and the circular cylindrical portion that oppose each other in the radial direction.