Insulating Coating Hardness in Laminated Cores for Magnetic Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing laminated cores face a challenge in achieving both high adhesive strength and excellent magnetic characteristics, as adhesives with higher strength often impart strain to the steel sheets, leading to deterioration of magnetic properties.
Innovation Solution
A laminated core design with an insulating coating between electrical steel sheets, having a hardness of 200 to 300 MPa and a weight-average molecular weight of the sol component between 10,000 to 100,000, which balances adhesive strength and magnetic characteristics by controlling hardness and molecular weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an adhesive with high adhesive strength is used to bond electrical steel sheets, then the bonding strength between sheets is improved, but the magnetic characteristics of the steel sheets deteriorate due to strain from curing shrinkage
Solution Approach 1:
The patent applies parameter changes by precisely controlling the hardness of the insulating coating within 200-300 MPa and the weight-average molecular weight of the sol component within 10,000-100,000. These parameter optimizations allow the coating to achieve sufficient adhesive strength while maintaining flexibility that reduces curing shrinkage strain, thereby preserving magnetic characteristics. The specific hardness range ensures the coating is hard enough for bonding but soft enough to minimize stress transmission to the steel sheets.
Solution Approach 2:
The patent uses a composite insulating coating containing a sol component with controlled molecular weight characteristics. This composite structure combines the adhesive properties of the coating material with the strain-absorbing characteristics of the sol component, creating a material that simultaneously provides strong bonding and reduced magnetic characteristic deterioration through its unique molecular structure.
2Strength
If the hardness of the insulating coating is increased to improve adhesive strength, then bonding between sheets is improved, but strain on steel sheets increases causing magnetic characteristic deterioration
Solution Approach 1:
The patent applies parameter changes by precisely controlling the hardness of the insulating coating within 200-300 MPa and the weight-average molecular weight of the sol component within 10,000-100,000. These parameter optimizations allow the coating to achieve sufficient adhesive strength while maintaining flexibility that reduces curing shrinkage strain, thereby preserving magnetic characteristics. The specific hardness range ensures the coating is hard enough for bonding but soft enough to minimize stress transmission to the steel sheets.
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 solution results in a laminated core with high adhesive strength and suppressed magnetic characteristics deterioration, suitable for use in rotary electric machines.
Implementation Method 1
an insulating coating that is provided between the electrical steel sheets adjacent to each other in a laminating direction and bonds the electrical steel sheets to each other
Data Source
AI summary
A laminated core includes a plurality of electrical steel sheets laminated on each other; and an insulating coating that is provided between the electrical steel sheets adjacent to each other in a laminating direction and bonds the electrical steel sheets to each other, wherein the insulating coating has a hardness of 200 to 300 MPa.