Grain-oriented electrical steel plate noise reduction via plastic strain control
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Solution Overview
Problem
Grain-oriented electrical steel sheets subjected to magnetic domain refining treatments exhibit varying noise levels in transformer manufacturing, despite similar iron loss and flux density characteristics, due to different patterns of thermal strain application.
Innovation Solution
Applying plastic strain regions in a dot-sequence manner within specific length and ratio ranges in the widthwise direction of the steel sheet during magnetic domain refining, using techniques like laser or electron beam irradiation, to control the shape and size of strain regions and reduce noise and iron loss in transformers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If magnetic domain refining treatment is applied to reduce iron loss, then iron loss decreases, but transformer noise increases
Solution Approach 1:
The patent applies local quality by creating plastic strain regions at specific locations on the steel sheet surface through selective laser or electron beam irradiation. These localized strain regions refine magnetic domains in specific areas without uniformly treating the entire surface, thereby reducing iron loss while controlling noise generation through spatially differentiated strain distribution
Solution Approach 2:
The patent segments the thermal strain application into discrete plastic strain regions rather than continuous treatment. By dividing the irradiation into separate zones with specific intervals, the patent achieves magnetic domain refining for iron loss reduction while the segmented structure prevents excessive noise generation that would result from continuous or excessive strain application
2Loss of energy
If thermal strain is applied in strong degree to refine magnetic domains, then iron loss reduces, but the shape of plastic strain regions increases transformer noise
Solution Approach 1:
The patent applies parameter changes by precisely controlling the irradiation conditions (laser power, scanning speed, beam diameter, interval between irradiation points) to regulate the degree and distribution of plastic strain. By adjusting these parameters, the patent optimizes the shape and size of plastic strain regions to achieve effective magnetic domain refining while maintaining acceptable noise levels
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 suppresses noise and reduces iron loss in transformers, enhancing energy efficiency and industrial applicability by optimizing the distribution of plastic strain regions.
Implementation Method 1
a method of applying magnetic domain refining by applying thermal strain to the surface of a steel sheet
Implementation Method 2
a method using laser or electron beam
Implementation Method 3
a method for manufacturing an electrical steel sheet having iron loss W 17/50 of below 0.8 W/kg due to electron beam irradiation
Implementation Method 4
the length d is obtained by measuring the half value width of the diffraction peak of the α-fe {112} plane by X-ray diffraction using a Cr-Kα X-ray
Implementation Method 5
measuring the half value width of the diffraction peak
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
In accordance with the present invention, it is possible to obtain a grain-oriented electrical steel sheet producing reduced noise when worked into a transformer, by setting length d of each plastic strain region in the widthwise direction of the steel sheet to 0.05 mm or more and 0.4 mm or less, and a ratio (Σd/Σw) of a total ∑d of the length d to a total ∑w of application interval w of each of the above plastic strain regions to 0.2 or more and 0.6 or less.