Grain-oriented electrical steel sheet, iron core of transformer, transformer, and method for reducing noise of transformer

Patent metadata

Field	Value
Publication number	US-11894167-B2
Application number	US-201716474646-A
Country	US
Kind code	B2
Filing date	Nov 17, 2017
Priority date	Dec 28, 2016
Publication date	Feb 6, 2024
Grant date	Feb 6, 2024

Abstract

A grain-oriented electrical steel sheet having an insulating film disposed on a surface thereon. The insulating film having a chemical composition comprising Si, P, O, and at least one selected from the group consisting of Mg, Ca, Ba, Sr, Zn, Al, Mn, and Co. The insulating film has a crystallinity in a range of 20% or more, and a minimum tension provided to the steel sheet by the insulating film at a temperature in a range of 100° C. to 200° C. is 10 MPa or more.

First claim

The invention claimed is:

1. A grain-oriented electrical steel sheet having an insulating film disposed on a surface thereon, the insulating film having a chemical composition comprising Si, P, O, and at least one selected from the group consisting of Mg, Ca, Ba, Sr, Zn, Al, Mn, and Co,
wherein the insulating film includes 20% or more of a crystal phase, the crystal phase consisting of one of Zr 2 P 2 O 7 , (MgCo) 2 P 2 O 7 , Co 2 P 2 O 7 , cordierite, β-spodumene, quartz, zircon, a zirconium phosphate-based crystal phase, or a tungsten phosphate-based crystal phase, and
a minimum tension provided to the steel sheet by the insulating film at a temperature in a range of 100° C. to 200° C. is 10.5 MPa or more.

2. The grain-oriented electrical steel sheet according to claim 1 , wherein the insulating film has a static friction coefficient in a range of 0.21 or more and 0.50 or less.

3. The grain-oriented electrical steel sheet according to claim 1 , wherein the chemical composition excludes Cr.

4. The grain-oriented electrical steel sheet according to claim 1 , wherein the insulating film has an average film thickness in a range of 4.5 μm or less.

5. An iron core of a transformer, the iron core including the grain-oriented electrical steel sheet according to claim 1 .

6. A transformer including the iron core according to claim 5 .

7. A method for reducing noise of a transformer, the method comprising providing an iron core of the transformer, the iron core including the grain-oriented electrical steel sheet according to claim 1 .

8. The grain-oriented electrical steel sheet according to claim 2 , wherein the chemical composition excludes Cr.

9. The grain-oriented electrical steel sheet according to claim 3 , wherein the insulating film has an average film thickness in a range of 4.5 μm or less.

10. An iron core of a transformer, the iron core including the grain-oriented electrical steel sheet according to claim 2 .

11. An iron core of a transformer, the iron core including the grain-oriented electrical steel sheet according to claim 3 .

12. An iron core of a transformer, the iron core including the grain-oriented electrical steel sheet according to claim 4 .

13. An iron core of a transformer, the iron core including the grain-oriented electrical steel sheet according to claim 9 .

14. A transformer including the iron core according to claim 10 .

15. A transformer including the iron core according to claim 11 .

16. A transformer including the iron core according to claim 12 .

17. A transformer including the iron core according to claim 13 .

18. A method for reducing noise of a transformer, the method comprising providing an iron core of the transformer, the iron core including the grain-oriented electrical steel sheet according to claim 2 .

19. A method for reducing noise of a transformer, the method comprising providing an iron core of the transformer, the iron core including the grain-oriented electrical steel sheet according to claim 3 .

20. A method for reducing noise of a transformer, the method comprising providing an iron core of the transformer, the iron core including the grain-oriented electrical steel sheet according to claim 4 .

Assignees

• Jfe Steel Corp

Inventors

• Terashima Takashi
• Watanabe Makoto
• Takamiya Toshito
• Okubo Tomoyuki

Classifications

• H01F1/153

  Amorphous metallic alloys, e.g. glassy metals {(making ferrous amorphous alloys C22C33/003)} · CPC title

• C21D8/1283

  Application of a separating or insulating coating · CPC title

• C23C22/12 Primary

  containing zinc cations · CPC title

• C23C22/22

  containing alkaline earth metal cations · CPC title

• C23C22/18

  containing manganese cations · CPC title