Laminated Core Tooth Adhesion Zoning for Lower Iron Loss
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Solution Overview
Problem
Conventional laminated cores face limitations in magnetic properties due to strain generated from adhesive shrinkage, leading to increased iron loss and potential degradation of magnetic performance.
Innovation Solution
A laminated core design where tooth parts at the center are not adhered to each other, while those on the sides are adhered, reducing strain and maintaining core shape with a controlled adhesion ratio and adhesive distribution, thereby improving magnetic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If tooth parts of all electrical steel sheets are adhered to each other by adhesive, then lifting (warping) of tooth parts is suppressed, but strain is generated in the electrical steel sheets due to adhesive shrinkage, increasing iron loss and degrading magnetic properties
Solution Approach 1:
The laminated core is divided into two distinct regions: an outer region where tooth parts are adhered to suppress lifting, and an inner region where tooth parts are not adhered to avoid strain. This segmentation allows different parts of the same structure to have different adhesion states, simultaneously achieving shape stability and low iron loss.
Solution Approach 2:
Different adhesion properties are applied to different locations within the laminated core. The outer peripheral portions use adhesion for structural stability, while the inner portions remain non-adhered to minimize strain. This local differentiation of quality optimizes both mechanical stability and magnetic performance in their respective zones.
2Loss of energy
If tooth parts of electrical steel sheets are not adhered to each other, then strain is suppressed and magnetic properties are improved, but lifting (warping) of tooth parts occurs
Solution Approach 1:
The solution segments the adhesion application into outer and inner regions. The outer region receives adhesion treatment to prevent lifting, while the inner region remains untreated to maintain low strain and optimal magnetic properties.
Solution Approach 2:
Different adhesion characteristics are assigned to different spatial locations: the outer peripheral tooth parts are adhered for structural integrity, while the inner tooth parts are left non-adhered for magnetic performance optimization.
3Stability of the object's composition
If adhesive is applied to all tooth parts, then structural stability is improved, but adhesive usage increases and cost rises
Solution Approach 1:
The adhesion treatment is segmented to apply only where structurally necessary (outer regions) rather than uniformly across all tooth parts. This reduces the total volume of adhesive required while maintaining sufficient structural stability.
Solution Approach 2:
Adhesive is applied locally only to the outer peripheral tooth parts where structural support is needed, rather than uniformly to all tooth parts. This localized application reduces material consumption while maintaining necessary structural integrity.
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 enhances magnetic properties by minimizing strain and preventing interlayer short circuits, while maintaining core shape and reducing adhesive usage, resulting in improved performance and efficiency.
Implementation Method 1
Generally, the adhesive shrinks at the time of curing. Therefore, compressive stress is applied to the electrical steel sheet as the adhesive is cured.
Data Source
AI summary
A laminated core includes: a plurality of electrical steel sheets stacked in a thickness direction, wherein the electrical steel sheet includes an annular core back part and a plurality of tooth parts protruding from the core back part toward a radial direction and arranged at intervals in a circumferential direction of the core back part, and wherein among the plurality of electrical steel sheets, the tooth parts of the electrical steel sheets located at one side on the outside in a stacking direction are adhered to each other by an adhesion part provided between the tooth parts adjacent to each other in the stacking direction, the tooth parts of the electrical steel sheets located at the other side on the outside in the stacking direction are adhered to each other by an adhesion part provided between the tooth parts adjacent to each other in the stacking direction, and the tooth parts of the electrical steel sheets located at a center part in the stacking direction are not adhered to each other.