Grain-Oriented Electrical Steel Grooves for Core Loss and Insulation
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Solution Overview
Problem
Grain oriented electrical steel sheets face challenges in simultaneously securing electrical insulation and core loss characteristics, particularly after stress relief annealing, due to limitations in magnetic domain refinement technologies.
Innovation Solution
The implementation of a grain oriented electrical steel sheet with a combination of continuous and discontinuous grooves, formed by linear and punctuated grooves respectively, using laser irradiation to improve magnetic and electrical insulation properties, where the grooves are strategically arranged and dimensioned to enhance coercive force and core loss characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If continuous grooves are formed for magnetic domain refinement, then core loss characteristics are improved, but electrical insulation is compromised
Solution Approach 1:
The continuous groove structure is segmented into discontinuous grooves with intervals, creating isolated groove sections that prevent electrical continuity while maintaining magnetic domain refinement effects in localized regions
Solution Approach 2:
Different regions of the steel sheet surface are treated differently - grooves are formed in specific patterns (discontinuous rather than continuous) to provide magnetic domain refinement where needed while preserving electrical insulation in other areas
2Loss of energy
If groove depth is increased to improve magnetic domain refinement, then core loss characteristics are enhanced, but mechanical strength and adhesion deteriorate
Solution Approach 1:
Instead of forming grooves across the entire surface or to excessive depths, the invention applies groove formation partially (discontinuous pattern) at controlled depths (5-15% of thickness) to achieve sufficient magnetic domain refinement while preserving mechanical integrity
Solution Approach 2:
The groove depth is controlled within a specific range (5-15% of sheet thickness) to optimize the balance between magnetic domain refinement effectiveness and mechanical strength preservation
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 approach effectively improves coercive force and core loss characteristics while enhancing electrical insulation properties, achieving a balanced magnetic and insulation performance.
Implementation Method 1
forming linear grooves by irradiating a continuous oscillation frequency laser to one surface or both surfaces of the grain oriented electrical steel sheet
Implementation Method 2
forming punctuated grooves by irradiating a pulsed oscillation frequency laser to one surface or both surfaces of the grain oriented electrical steel sheet
Data Source
AI summary
A grain oriented electrical steel sheet, according to one embodiment of the present invention, comprises: linear grooves formed on one surface or both surfaces of the electrical steel sheet in the direction (X1 direction) crossing a rolling direction; and punctuated grooves formed on one surface or both surfaces of the electrical steel sheet so as to be arranged in the direction (X2 direction) crossing the rolling direction, wherein the plurality of linear grooves and the plurality of punctuated grooves are formed in the rolling direction, and an interval (D3) between the punctuated grooves with respect to an arrangement direction (X2 direction) of the punctuated grooves is 0.02 to 1.7 times the interval (D2) between the punctuated grooves with respect to the rolling direction.