Laminated Motor Core Structure With Selective Tooth Adhesion
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Solution Overview
Problem
The magnetic properties of existing laminated cores are not optimized, leading to increased iron loss and potential strain due to adhesive application and fastening methods, which can affect the magnetic circuit and overall performance of electric motors.
Innovation Solution
A laminated core design featuring alternating tooth parts with and without adhesion, where the adhesion is applied only to some tooth parts and fastening is strategically placed in the core back part corresponding to specific tooth parts, minimizing strain and stress, thereby improving magnetic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied to all tooth parts for lamination, then lamination strength is improved, but strain occurs in all tooth parts causing increased iron loss
Solution Approach 1:
The tooth parts are segmented into two groups: first tooth parts with adhesion parts where adhesive is applied, and second tooth parts without adhesion parts where no adhesive is applied. This segmentation allows selective adhesion to reduce overall strain while maintaining necessary lamination strength in critical areas.
Solution Approach 2:
Different adhesion qualities are applied to different tooth parts. The first tooth parts have full adhesion for strong bonding, while the second tooth parts have no adhesion to avoid strain. This local differentiation optimizes the balance between lamination strength and strain reduction.
2Stability of the object's composition
If fastening part is provided in the core back part corresponding to tooth parts, then lamination stability is improved, but magnetic flux path may be obstructed
Solution Approach 1:
The fastening part, which could potentially obstruct magnetic flux, is strategically positioned in the core back part corresponding to tooth parts. This converts a potential harmful effect into a beneficial one by utilizing the natural magnetic flux distribution pattern where flux branches at tooth parts, minimizing obstruction while maintaining lamination stability.
3Strength
If adhesive is applied to tooth parts, then adhesion between layers is improved, but compressive stress and strain occur during curing
Solution Approach 1:
The tooth parts are divided into first tooth parts with adhesion parts where adhesive is applied for strong layer bonding, and second tooth parts without adhesion parts where no adhesive is applied. This segmentation reduces the total area subject to compressive stress during curing while maintaining necessary adhesion in critical regions.
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
This configuration reduces iron loss and enhances magnetic properties by balancing compressive stress and winding-induced stress, resulting in improved performance of electric motors.
Implementation Method 1
an adhesive shrinks during curing. Therefore, when the adhesive is provided on the electrical steel sheet, a compressive stress is applied to the electrical steel sheet as the adhesive cures
Implementation Method 2
a region of the core back part not corresponding to any of the tooth parts (a region between adjacent tooth parts) is a path of a magnetic flux
Data Source
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AI summary
A laminated core includes a plurality of electrical steel sheets stacked in a thickness direction, the electrical steel sheet includes an annular core back part and a plurality of tooth parts that protrude from the core back part in a radial direction and are disposed at intervals in a circumferential direction of the core back part, a fastening part is provided in a portion of the core back part corresponding to the tooth part, and an adhesion part is provided in the tooth part.