Grain-oriented electrical steel sheet and manufacturing method therefor
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Solution Overview
Problem
Existing grain-oriented electrical steel sheets face a trade-off between reducing iron loss and noise, with existing magnetic domain refinement techniques failing to achieve both simultaneously.
Innovation Solution
A method involving selective application of tensile stress along specific regions of the steel sheet based on β angle distribution, with controlled magnetic domain control treatment lines, to refine magnetic domains and reduce iron loss while minimizing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If magnetic domain refinement treatment is applied to reduce iron loss, then iron loss is reduced, but noise increases due to magnetostriction characteristic changes
Solution Approach 1:
The patent applies different tensile stress conditions to different regions of the steel sheet based on local β angle characteristics. Regions with β angle ≤ 2° receive tensile stress treatment with 50-80% existence rate, while regions with β angle > 2° receive treatment with 0-30% existence rate. This localized differentiation refines magnetic domains in critical regions without excessively refining regions where it would increase noise, thus resolving the contradiction between iron loss reduction and noise control.
2Loss of energy
If tensile stress is applied uniformly across the steel sheet, then magnetic domain refinement is promoted and iron loss is reduced, but noise increases due to excessive refinement in certain regions
Solution Approach 1:
The patent implements non-uniform tensile stress application by controlling the tensile stress existence rate differently across regions with different β angle characteristics. This ensures that tensile stress is applied primarily where it benefits iron loss reduction without causing excessive magnetic domain refinement that would increase noise, thereby resolving the contradiction between uniform refinement benefits and localized noise problems.
3Loss of energy
If magnetic domain refinement is performed without considering β angle distribution, then iron loss is reduced, but the magnetostriction characteristic changes and noise increases
Solution Approach 1:
The patent performs preliminary analysis of β angle distribution across the steel sheet surface before applying tensile stress. By pre-identifying regions with different β angle characteristics, the system can then apply tensile stress selectively to regions where it will reduce iron loss without causing excessive noise, thus preventing the magnetostriction characteristic changes that lead to noise increase.
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 method achieves both reduced iron loss and noise in grain-oriented electrical steel sheets by optimizing magnetic domain refinement through targeted tensile stress application.
Implementation Method 1
a magnetic domain refinement treatment, the energy density of the laser with which the steel sheet part is irradiated is increased
Implementation Method 2
a tensile stress is applied as a method of magnetic domain refinement of a grain-oriented electrical steel sheet
Implementation Method 3
a magnetic domain refinement technique for reducing a magnetic domain width by irradiating a surface of a grain-oriented electrical steel sheet with a laser
Implementation Method 4
a magnetic domain refinement technique for reducing a magnetic domain width by irradiating a surface of a grain-oriented electrical steel sheet with a laser or an electron beam
Implementation Method 5
the magnetostriction characteristic changes due to the reflux magnetic domain and the noise of the transformer increases
Data Source
AI summary
In the grain-oriented electrical steel sheet according to an aspect of the present invention, on a surface of the grain-oriented electrical steel sheet, a tensile stress existence rate which is a rate of a part which exists in a non-single period and where a tensile stress exists with respect to a sheet thickness direction among a total extension of magnetic domain control treatment lines which forms an angle of 0° to 45° with respect to an orthogonal-to-rolling direction and are arranged in a rolling direction is 50% or more in a first region which is a region where a β angle which is a deviation angle of a grain from a Goss orientation around an axis in the orthogonal-to-rolling direction is 1° or less, the tensile stress existence rate is less than 50% in a second region where the β angle is more than 2°, and the tensile stress has an absolute maximum value of 40 MPa or more.