Grain-Oriented Electrical Steel Strain Layout for Low-Loss Transformers
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Solution Overview
Problem
Grain-oriented electrical steel sheets used in transformers face challenges in fully utilizing low iron loss properties due to increased building factor caused by high orientation, leading to elevated rotational iron loss and transformer noise, particularly at joints, which necessitates a new strain introduction pattern that balances iron loss reduction with minimized magnetostriction.
Innovation Solution
A grain-oriented electrical steel sheet with a thermal strain-imparted region extending linearly across the rolling direction, where tensile strain at both ends exceeds the strain at the center, achieving a strain distribution difference of 0.040% to 0.200%, effectively reducing rotational iron loss and transformer noise while maintaining low iron loss properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If non-heat-resistant magnetic domain refining is applied to reduce eddy current loss, then iron loss is reduced, but magnetostriction properties deteriorate leading to increased noise
Solution Approach 1:
The patent introduces linear grooves at specific locations (both ends and center) rather than uniform strain distribution. This localized approach refines magnetic domains to reduce eddy current loss while concentrating strain in specific regions, thereby minimizing the impact on overall magnetostriction properties and reducing transformer noise.
Solution Approach 2:
The patent segments the strain introduction into multiple linear groove groups at different positions. This segmentation allows the eddy current loss to be reduced through magnetic domain refinement while the distributed strain pattern prevents excessive magnetostriction, thus resolving the contradiction between energy loss reduction and noise control.
2Loss of energy
If linear grooves are introduced for heat-resistant magnetic domain refining to reduce iron loss, then eddy current loss is reduced, but magnetic permeability deteriorates
Solution Approach 1:
The patent introduces linear grooves at specific positions (both ends and center) rather than continuous grooves across the entire sheet. This localized strain introduction reduces eddy current loss through magnetic domain refinement while minimizing the impact on overall magnetic permeability, thereby resolving the contradiction between reducing eddy current loss and maintaining magnetic permeability.
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 results in improved transformer properties by reducing energy loss and noise, with the optimal strain distribution enhancing the building factor and maintaining the benefits of magnetic domain refining.
Implementation Method 1
a thermal strain-imparted region extending linearly across the rolling direction
Implementation Method 2
refine the width of 180° magnetic domain (main magnetic domain) formed along the rolling direction, thereby reducing the iron loss
Implementation Method 3
the noise is affected by the magnetostrictive properties of the grain-oriented electrical steel sheet
Data Source
AI summary
Provided is a grain-oriented electrical steel sheet that achieves both low iron loss and low magnetostriction and has excellent transformer properties. The grain-oriented electrical steel sheet has a thermal strain-imparted region extending linearly in a direction crossing the rolling direction, and in the strain distribution in the rolling direction of the thermal strain-imparted region, the strain at both ends of the thermal strain-imparted region is tensile strain larger than the strain at the center of the thermal strain-imparted region.