Grain-Oriented Steel Sheet Tension Coating for Transformer Noise Reduction
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Solution Overview
Problem
Grain oriented electrical steel sheets with grooves for magnetic domain refinement suffer from increased transformer noise due to plastic deformation when pressed by a measuring roll, leading to deterioration in noise properties during transformer manufacturing.
Innovation Solution
A grain oriented electrical steel sheet with linear grooves and a tension coating applied in specific amounts on both surfaces, where the coating amount on the grooved surface (A) is between 3 and 8 g/m² and the coating amount on the non-grooved surface (B) is between 1.0 and 1.8 times A, ensuring the coating thickness on the non-grooved surface is greater, thereby increasing tensile stress and preventing embrittlement and powdering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If grooves are introduced into the steel sheet surface for magnetic domain refinement, then iron loss is reduced, but transformer noise increases due to plastic deformation when pressed by measuring roll
Solution Approach 1:
The patent applies different coating amounts to different regions of the steel sheet surface. The grooved regions receive a coating amount A (3-8 g/m²), while the non-grooved regions receive a coating amount B (1.0-1.8 times A). This local differentiation allows the grooves to function for magnetic domain refinement while the surrounding areas provide sufficient coating thickness to prevent plastic deformation and noise during measuring roll pressing.
2Object-generated harmful factors
If coating thickness is increased to prevent plastic deformation and noise, then noise properties are improved, but manufacturing cost increases
Solution Approach 1:
Instead of uniformly increasing coating thickness across the entire surface, the patent implements local quality by applying higher coating amounts only where necessary (non-grooved regions with amount B), while maintaining lower coating amounts in grooved regions (amount A). This targeted approach prevents noise and plastic deformation without incurring the full cost of universal thick coating.
Solution Approach 2:
The patent applies coating in varying amounts rather than uniform thickness. By applying excessive coating (amount B) only in specific non-grooved regions that are prone to plastic deformation, and sufficient but not excessive coating (amount A) in grooved regions, the solution achieves noise prevention with optimized material usage and manufacturing cost.
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 suppresses transformer noise by maintaining excellent noise properties throughout the manufacturing process and in the final transformer, preventing plastic deformation and coating peeling, while avoiding increased manufacturing costs associated with excessive coating thickness.
Implementation Method 1
The tension coating causes a tensile stress in the grain oriented electrical steel sheet, to thereby effecting improvement in magnetostrictive property and reduction of transformer noise
Implementation Method 2
there has been developed a technique of introducing non-uniform strain or grooves into a surface of a steel sheet by physical means or chemical means to subdivide the width of magnetic domains to reduce iron loss, i.e., magnetic domain refinement technique
Data Source
Figure 1
AI summary
Provided is a grain oriented electrical steel sheet having excellent noise property capable of suppressing noise of an actual transformer which is configured by a steel sheet material having grooves formed therein for magnetic domain refining. In a grain oriented electrical steel sheet having grooves on one surface of the steel sheet formed for magnetic domain refining, the steel sheet comprising a forsterite film and a tension coating on the front and back surfaces of the steel sheet, the tension coating is applied on a surface with the grooves in a coating amount A (g/m2) and is applied on a surface with no groove in a coating amount B (g/m2), the coating amounts A and B being restricted to fall within a predetermined range.