Grain Oriented Steel Sheet Magnetostriction Control
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Solution Overview
Problem
Conventional techniques for grain oriented electrical steel sheets are insufficient in reducing magnetostriction velocity level (Lva), particularly in middle to high magnetic field ranges, and fail to effectively control the texture of the steel sheet to minimize transformer noise and improve iron loss characteristics.
Innovation Solution
A grain oriented electrical steel sheet with a specific chemical composition and controlled texture, including deviation angles and grain sizes, is developed to optimize the alignment of crystal orientations and introduce local and low-angle subboundaries, which reduces magnetostriction velocity and enhances iron loss characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If crystal orientation is controlled to align with {110} orientation, then iron loss characteristics are improved, but magnetostriction velocity level in middle to high magnetic field range remains high
Solution Approach 1:
The invention introduces grain size ratio parameters (RαL/RβL and RαL/RγL) as new control variables alongside crystal orientation alignment. By controlling both the alignment degree to {110} orientation and the grain size ratios within specific ranges, the invention simultaneously optimizes iron loss characteristics and reduces magnetostriction velocity level, overcoming the limitation of conventional techniques
2Object-generated harmful factors
If deviation angles are controlled to minimize magnetostriction, then transformer noise is reduced, but iron loss characteristics are not optimized
Solution Approach 1:
The invention changes the control parameters to include grain size ratios (RαL/RβL, RαL/RγL) and crystal orientation alignment degree in addition to deviation angle δ. This multi-parameter control strategy enables simultaneous optimization of both transformer noise reduction and iron loss characteristics, achieving a balance that conventional single-parameter control cannot achieve
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 solution effectively decreases magnetostriction velocity in middle to high magnetic fields, leading to reduced transformer noise and improved iron loss characteristics, by optimizing the crystal orientation and grain structure of the steel sheet.
Implementation Method 1
the magnetostriction is a phenomenon in which a shape of magnetic material changes when magnetic field is applied. Since the magnetostriction causes vibration and noise
Data Source
AI summary
A grain oriented electrical steel sheet includes the texture aligned with Goss orientation. In the grain oriented electrical steel sheet, when a grain size RAαL, a grain size RAβL, and a grain size RAγL are defined in a rolling direction L, the grain sizes satisfy RAβL<RAαL and RAγL<RAαL.