Grain-oriented electrical steel plate

An electromagnetic steel plate, orientation technology, applied in the direction of inorganic material magnetism, electron beam welding equipment, laser welding equipment, etc., can solve the problems of magnetic domain width expansion, iron loss deterioration, eddy current loss increase, etc. The effect of reducing iron loss and improving energy efficiency

Active Publication Date: 2014-10-15
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in general, as the magnetic flux density increases, the core loss tends to deteriorate
This is because the magnetostatic energy decreases when the crystal orientation is consistent, so the width of the magnetic domain in the steel sheet increases, and the eddy current loss increases.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Prepare the magnetic flux density B in the rolling direction with a plate thickness of 0.23mm 8 It is 1.94T and has a two-layer coating (silicon dioxide-phosphate coating) on ​​the surface of the steel base with a coating mainly composed of forsterite and a coating made of sintering an inorganic treatment liquid on the coating. Coils of film grain-oriented electrical steel sheets.

[0080] First, a veneer sample with a width of 100 mm and a length of 400 mm was cut out from the coil, and irradiated with a Q-switched pulse-oscillated fiber laser to perform magnetic domain refining treatment. By changing the beam diameter of the laser in the range of 0.05 to 0.6mm by defocusing, the repetition interval in the width direction is set to 0.1 to 1.2mm, and the output power that minimizes the iron loss is searched for.

[0081] Here, by increasing the beam diameter, the beam output power is increased in a manner sufficient to introduce sufficient thermal strain corresponding ...

Embodiment 2

[0090] The same grain-oriented electrical steel sheet as in Example 1 was irradiated with electron beams to refine the magnetic domains.

[0091] The electron beam is set at accelerating voltage: 60kV, beam diameter: 0.25mm, and after stopping at one point for 10ms, it moves to the next irradiation point at repeated intervals of 0.34mm and 0.5mm. Otherwise, follow the conditions described in Table 2 Irradiate. Furthermore, the width of the plastic strain region was 0.2 mm, and the conditions for minimizing the iron loss were searched for, and this was fabricated into a transformer core in the same manner as in Example 1, and the iron loss and noise were measured.

[0092] [Table 2]

[0093]

[0094] As shown in Table 2, the result was obtained that the coil irradiated with electron beams had an iron loss value smaller than that of Example 1 by 22 W or more.

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Abstract

A grain-oriented electrical steel plate with reduced noise when fabricated as a transformer can be obtained by making the respective lengths (d) of the plastic strain regions of the steel plate in the transverse direction to be 0.05 to 0.4 mm and the ratio ([sum]d / [sum]w) of the total ([sum]d) of the lengths (d) to the total ([sum]w) of the respective introduction intervals (w) for the plastic strain regions to be 0.2 to 0.6 according to the present invention.

Description

technical field [0001] The present invention relates to a grain-oriented electrical steel sheet used as an iron core material for transformers and the like. Background technique [0002] In recent years, the efficiency of energy use has been promoted, and the demand for electrical steel sheets with high magnetic flux density and low iron loss has been increasing, mainly from transformer manufacturers. [0003] The improvement of the magnetic flux density can be realized by concentrating the crystal orientation of the electrical steel sheet toward the Goss orientation. [0004] In addition, regarding the reduction of iron loss, countermeasures can be considered from the viewpoints of high purity of raw materials, high orientation, thin plate thickness, addition of Si and Al, and magnetic domain refinement. However, in general, when the magnetic flux density is increased, the iron loss tends to deteriorate. This is because, when the crystal orientations are aligned, the magn...

Claims

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Application Information

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IPC IPC(8): C22C38/00B23K15/00B23K26/00C21D8/12H01F1/16C22C38/60
CPCC21D2201/05B23K26/00C22C38/60C22C38/00C22C38/04C21D1/38C21D8/125H01F1/16B23K15/00C21D8/12C22C38/02C22C38/002C22C38/008C22C38/08C22C38/12C22C38/16
Inventor 冈部诚司高城重宏河野崇史
Owner JFE STEEL CORP
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