Armature Core Segment Contact for Rigidity
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Solution Overview
Problem
Conventional rotary electric machine armatures face issues with noise due to weak fastening forces and reduced rigidity, resulting in poor quietness and increased vibration, primarily because the fastening portions have limited size and slender bolts are used, and the segments only contact at circumferential side surfaces.
Innovation Solution
The armature core is configured with first and second core segments that have projecting mounting portions and penetrating apertures, allowing for increased holding strength and rigidity by contacting facing side surfaces and inner/outer circumferential surfaces, enabling larger bolt apertures and improved assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the diameter of bolt insertion apertures is increased, then the fastening force is improved, but the seat area of the fastening portions is reduced
Solution Approach 1:
The fastening portion is designed to protrude in the circumferential direction, adding a third dimension to the fastening structure. This allows the bolt insertion aperture to be larger while maintaining sufficient seat area through the protruding geometry, resolving the contradiction between fastening force and seat area
2Device complexity
If the first stator segments and second stator segments contact only at circumferential side surfaces, then the assembly is simplified, but the rigidity of the linked bodies is reduced
Solution Approach 1:
The armature is divided into multiple first and second stator segments that are assembled in an annular shape. The segments contact at both circumferential side surfaces and radial surfaces, creating a segmented structure that maintains rigidity while allowing simplified modular assembly
3Area of stationary object
If slender fastening bolts are used, then the fastening portion size is reduced, but the fastening force becomes weak
Solution Approach 1:
The fastening portion protrudes in the circumferential direction, utilizing the third dimension to provide adequate seat area for strong fastening bolts without increasing the planar footprint of the fastening portion, thus allowing both reduced size and maintained strength
Data Source
AI summary
An armature core is configured by arranging into an annular shape: at least one first core segment that includes: a first core back portion; a first tooth portion; and a mounting portion that is formed on an outer circumferential portion of the first core back portion; and a plurality of second core segments that include: a second core back portion; and a second tooth portion; the mounting portion includes projecting portions that project on two circumferential sides from the first core back portion; and the first core segments and the second core segments that are adjacent to each other are fixed in a state in which facing side surfaces between the first core back portions and the second core back portions contact each other, and inner circumferential surfaces of the projecting portions and outer circumferential surfaces of the second core back portions are in contact.