Grain-Oriented Electrical Steel Sheet Coating for Iron Loss and Noise Reduction
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Solution Overview
Problem
Existing oriented electrical steel sheets face challenges in achieving low iron loss and reducing transformer noise due to inadequate grain size control and insufficient noise reduction by conventional coating methods, which also impact transformer efficiency and noise levels.
Innovation Solution
An oriented electrical steel sheet with a forsterite film and a ceramic layer formed on partial regions, using ceramic powder with specific tension and thickness characteristics, and an insulating film layer to improve iron loss and noise reduction, while controlling grain size and film properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If MnS, AIN, MnSe are used as growth inhibitors, then primary grain growth is suppressed, but steel slab must be heated to high temperature for long time
Solution Approach 1:
The invention changes the chemical composition parameters by adding specific elements (Ti, V, Nb, Ta) to form new types of precipitates. This allows achieving the same grain growth inhibition effect with different material parameters, enabling lower heating temperatures and reduced energy consumption while maintaining manufacturing precision for grain size control.
Solution Approach 2:
The invention uses composite precipitates formed by multiple elements (Ti, V, Nb, Ta) combined with interstitial elements (N, C) to create composite material structures within the steel slab. These composite precipitates provide superior grain growth inhibition compared to single-element inhibitors, allowing reduced heating requirements and energy consumption.
2Use of energy by stationary object
If antimony (Sb) element is added to improve magnetic properties, then low-temperature heating is enabled, but grain size becomes uneven and coarse
Solution Approach 1:
The invention creates composite precipitates by combining Ti, V, Nb, or Ta with interstitial elements N and C. These composite material structures provide effective grain refinement and uniform grain size distribution, resolving the grain coarsening problem caused by Sb addition while maintaining low-temperature heating capabilities.
Solution Approach 2:
The invention changes the material composition parameters by introducing specific ratios of Ti/V/Nb/Ta (0.001-0.05 wt%) combined with N and C content (0.003-0.05 wt%). This parameter optimization enables fine grain size control and uniform grain distribution at lower heating temperatures, counteracting the grain coarsening effect of Sb.
3Reliability
If conventional insulating film is formed on steel sheet surface, then electrical insulation is improved, but transformer noise is insufficiently reduced
Solution Approach 1:
The invention applies a composite coating structure combining organic insulating film with inorganic powder particles (alumina, silica, titania, zirconia). This composite material provides both electrical insulation from the organic film and noise reduction through the inorganic particles' magnetostriction suppression, simultaneously addressing both requirements.
Solution Approach 2:
The invention incorporates inorganic powder particles at specific locations within the insulating film structure. These localized inorganic regions provide targeted noise reduction properties while the surrounding organic matrix maintains electrical insulation, achieving local quality differentiation to satisfy both functions.
4Object-affected harmful factors
If thick insulating film is coated to reduce 90° magnetic domain, then noise reduction effect is improved, but transformer drop ratio and efficiency deteriorate
Solution Approach 1:
The invention concentrates noise reduction functionality in localized inorganic powder particles dispersed within a thin organic insulating film. This local quality approach provides effective noise suppression without requiring thick coating, thereby maintaining good transformer drop ratio and efficiency by minimizing the overall coating thickness.
Solution Approach 2:
The composite coating structure allows thin film application because the inorganic powder particles (alumina, silica, titania, zirconia) provide enhanced noise reduction per unit thickness. This enables achieving sufficient noise control with thinner total coating, reducing energy losses and maintaining transformer efficiency.
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 reduces iron loss and transformer noise, enhancing the magnetic characteristics and manufacturing efficiency of the steel sheet by patterning the ceramic layer and optimizing film properties, thereby improving transformer performance.
Implementation Method 1
a research on a magnetostrictive phenomenon is required to reduce the noise of the insulating film of the oriented electrical steel sheet
Implementation Method 2
tensile stress is applied to the steel sheet using a difference in thermal expansion coefficient of the insulating film to promote a noise reduction effect caused due to magnetic deformation
Implementation Method 3
the insulating film needs to basically have a high electrical insulating property and needs to be excellent in adhesion to a material
Data Source
AI summary
Provided is an oriented electrical steel sheet including: a forsterite film formed on one side or both sides of an oriented electrical steel sheet substrate; and a ceramic layer formed on an entire or partial region of the forsterite film. Provided is a manufacturing method for an oriented electrical steel sheet including: preparing an oriented electrical steel sheet having a forsterite film formed on one surface or both surfaces thereof; and forming a ceramic layer by spraying ceramic powder on the forsterite film.