Grain-Oriented Steel Laser Domain Control for Iron Loss Reduction
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Solution Overview
Problem
Conventional methods for manufacturing grain-oriented electromagnetic steel sheets fail to effectively reduce iron losses in both the L-direction and C-direction, leading to increased power transmission losses in transformers, and existing solutions either prioritize one direction over the other or complicate the manufacturing process, resulting in low productivity.
Innovation Solution
A method involving repeated irradiation of a grain-oriented electromagnetic steel sheet with a condensed continuous-wave laser beam, where the scanning velocity, irradiation pitch, and power density are optimized to achieve a specific range of average energy density and power density, allowing for simultaneous reduction of L-direction and C-direction iron losses while maintaining high productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional laser beam irradiation methods are used to reduce iron losses in one direction, then productivity is maintained, but iron losses in the other direction remain high
Solution Approach 1:
The laser beam irradiation process continues with multiple passes without interrupting the manufacturing flow. The steel sheet is irradiated first in one orientation, then immediately irradiated again in a different orientation, maintaining continuous processing and high productivity while achieving comprehensive iron loss reduction in both directions.
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 effectively reduces iron losses in both directions, enhancing the magnetic characteristics of the steel sheet and transformer cores, thereby minimizing power transmission losses and improving manufacturing efficiency.
Implementation Method 1
repeatedly irradiating a surface of a grain-oriented electromagnetic steel sheet with a condensed continuous-wave laser beam
Implementation Method 2
when an average irradiation energy density Ua is defined as Ua = P/Vc×PL (mJ/mm2), a light condensing power density Ip of the continuous-wave laser beam is defined as Ip = (4/π)×P/(dL×dc) (kW/mm2), and a relationship between the average irradiation energy density Ua and the light condensing power density Ip satisfies Ip×PL0.5≤0.09, it has been found that the C-direction iron losses WC are reduced
Data Source
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AI summary
There is provided a method for manufacturing a grain-oriented electromagnetic steel sheet whose iron losses are reduced by laser beam irradiation, capable of improving the iron losses in both the L-direction and the C-direction while easily ensuring high productivity. The method for manufacturing a grain-oriented electromagnetic steel sheet reduces iron losses by scanning and irradiating a grain-oriented electromagnetic steel sheet with a continuous-wave laser beam condensed into a circular or elliptical shape at constant intervals in a direction substantially perpendicular to a rolling direction of the grain-oriented electromagnetic steel sheet, wherein when an average irradiation energy density Ua is defined as Ua = P/(Vc×PL) (mJ/mm2), where P (W) is average power of the laser beam, Vc (m/s) is a beam scanning velocity, and PL (mm) is an irradiation interval in a rolling direction, PL and Ua are in the following ranges: 1.0 mm ≤ PL ≤ 3.0 mm, 0.8 mJ/mm2 ≤ Ua ≤ 2.0 mJ/mm2.