Laminated Core Adhesion Ratio for Low-Strain Magnetic Performance
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Solution Overview
Problem
Conventional laminated cores have room for improvement in enhancing magnetic properties, as they face issues with relative displacement and strain due to inadequate adhesion between electrical steel sheets, which affects their magnetic performance.
Innovation Solution
A laminated core design featuring electrical steel sheets with an insulation coating and an adhesion part that adheres adjacent sheets with an adhesion area ratio between 1% and 40%, ensuring effective restriction of relative displacement and minimizing strain through controlled adhesion, thereby enhancing magnetic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If electrical steel sheets are fixed by fastening, then relative displacement between sheets is restricted, but the sheets are greatly strained and magnetic properties are greatly affected
Solution Approach 1:
The patent replaces mechanical fastening (screws, clips, or other rigid fixation mechanisms) with an adhesion-based bonding system. The adhesion part uses adhesive forces to bond electrical steel sheets together, eliminating the need for mechanical fasteners that cause localized stress concentrations and strain. This substitution maintains structural stability while preserving magnetic properties by avoiding mechanical deformation of the steel sheets.
Solution Approach 2:
The patent changes the bonding mechanism from rigid mechanical connection to flexible adhesion with controlled area ratio. By adjusting the adhesion area ratio parameter to 1% or more, the patent achieves sufficient bonding strength to prevent relative displacement while keeping the adhesion area limited to maintain magnetic properties. This parameter optimization resolves the contradiction between stabilization and magnetic property preservation.
2Strength
If electrical steel sheets are not fixed, then magnetic properties are preserved, but relative displacement occurs between sheets
Solution Approach 1:
The patent applies adhesion locally rather than uniformly across the entire surface of electrical steel sheets. The adhesion part is positioned at specific locations (such as peripheral edges or selected regions) with a controlled area ratio of 1% or more. This local adhesion approach provides sufficient stabilization to prevent relative displacement while leaving the majority of the sheet surface strain-free, thereby preserving magnetic properties in the bulk material.
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
The proposed design effectively restricts relative displacement and reduces strain in the laminated core, leading to improved magnetic properties and better adhesion strength, even during winding processes, while maintaining a balance to prevent excessive strain and ensure efficient magnetic flux distribution.
Implementation Method 1
an adhesion part provided between the electrical steel sheets adjacent to each other in a stacking direction and configured to adhere the electrical steel sheets to each other
Implementation Method 2
electrical steel sheets stacked on each other and coated with an insulation coating on both surfaces thereof
Data Source
AI summary
A laminated core includes a plurality of electrical steel sheets stacked on each other and coated with an insulation coating on both surfaces thereof, and an adhesion part provided between the electrical steel sheets adjacent to each other in a stacking direction and configured to adhere the electrical steel sheets to each other, wherein an adhesion area ratio of the electrical steel sheet by the adhesion part is 1% or more and 40% or less.