Grain-Oriented Steel Sheet Iron Loss Reduction via Electron Beam Strain
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Solution Overview
Problem
Grain oriented electrical steel sheets with reduced iron loss through magnetic domain refinement techniques do not effectively improve iron loss properties when used in transformers, leading to poor building factors due to increased iron loss from magnetization rotation.
Innovation Solution
Introducing strain-imparted areas in a dotted line pattern with specific sizes and intervals to reduce iron loss in both the rolling direction and the direction orthogonal to the rolling direction, utilizing electron beam irradiation to optimize strain distribution and magnetic domain refinement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If strain is imparted to reduce iron loss, then magnetic domain width is narrowed and iron loss decreases, but manufacturing complexity increases due to precise control requirements
Solution Approach 1:
The patent applies segmentation by dividing the strain-imparting process into discrete, patterned regions (dots or lines) rather than continuous treatment. This segmentation allows the use of focused energy sources like electron beams or lasers to create specific strain patterns at controlled intervals, simplifying the manufacturing process while achieving the desired magnetic domain refinement. The segmented approach enables precise control without requiring complex continuous processing systems.
Solution Approach 2:
The patent replaces traditional mechanical strain imparting methods with energy-based methods such as electron beam irradiation or laser heating. This substitution eliminates the need for complex mechanical rolling or pressing equipment, allowing strain to be imparted through localized thermal or electromagnetic effects that are easier to control and pattern. The energy-based approach enables precise spatial control of strain regions without complex mechanical tooling.
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 approach effectively reduces iron losses in both directions, resulting in a grain oriented electrical steel sheet with lower transformer iron loss, as demonstrated by experimental results showing decreased iron loss values under optimal strain conditions.
Implementation Method 1
an electron beam is irradiated according to variety of irradiation conditions
Implementation Method 2
a phenomenon called as magnetization rotation is known to occur. In magnetization rotation, the magnetization direction is oriented to a direction other than the rolling direction when magnetic excitation is provided
Implementation Method 3
a technique of irradiating a steel sheet as a finished product with laser to introduce high-dislocation density regions into a surface layer of the steel sheet
Implementation Method 4
The increased tension in a direction of the dotted line causes a larger value of magnetic permeability in a direction orthogonal to the rolling direction by inverse magnetostriction effect
Data Source
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AI summary
An object of the present invention is to propose a grain oriented electrical steel sheet capable of reducing iron loss when utilized in a iron core for a transformer and the like in a stacked state by means of magnetic domain refinement technique. Specifically, the grain oriented electrical steel sheet of the present invention has thermal strain introduced thereinto in a dotted-line arrangement in which strain-imparted areas have been lined in a direction that crosses the rolling direction of the steel sheet, wherein the strain-imparted areas introduced in the dotted-line arrangement have a size from 0.10 mm or more to 0.50 mm or less and an interval between the adjacent strain-imparted areas is from 0.10 mm or more to 0.60 mm or less.