Non-oriented electrical steel sheets, cores, and rotating electrical machines

A non-oriented electrical steel sheet with a {411} orientation and optimized chemical composition addresses manufacturing burdens and alignment issues, achieving low stress sensitivity and improved magnetic properties in ±45-degree directions for enhanced core and machine performance.

JP7883188B2Active Publication Date: 2026-07-01NIPPON STEEL CORPORATION
View PDF 13 Cites 0 Cited by

Patent Information

Application Number
JP2025513200
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2023-04-05
Filing Date
2024-04-05
Publication Date
2026-07-01
Estimated Expiration
2044-04-05

AI Technical Summary

Technical Problem

Existing electromagnetic steel sheets face challenges in achieving low iron loss and high magnetic flux density while maintaining plate thickness, with manufacturing methods like rapid cooling causing high manufacturing burdens and inadequate alignment of α fibers, leading to insufficient magnetic properties in directions deviated from the rolling direction.

Method used

Developing a non-oriented electrical steel sheet with a specific {411} plane orientation, controlled chemical composition, and optimized manufacturing processes such as increased heating rates and finish annealing temperatures to enhance magnetic properties in directions ±45 degrees to the rolling direction, reducing stress sensitivity.

Benefits of technology

The solution results in a steel sheet with low stress sensitivity and improved magnetic properties in ±45-degree directions, suitable for manufacturing cores and rotating electric machines with enhanced performance.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure 0007883188000001
    Figure 0007883188000001
  • Figure 0007883188000002
    Figure 0007883188000002
  • Figure 0007883188000003
    Figure 0007883188000003
Patent Text Reader

Abstract

This non-oriented electromagnetic steel sheet contains, in mass %, C: 0.0100% or less, Si: 1.50-4.00%, sol. Al: 0.0001-1.00%, S: 0.0100% or less, N: 0.0100% or less, and one or more selected from the group consisting of Mn, Ni, and Cu: total of 2.50-5.00%. When, in mass%, Mn content is taken to be [Mn], the Ni content is taken to be [Ni], the Cu content is taken to be [Cu], the Si content is taken to be [Si], the sol. Al content is taken to be [sol. Al], and the P content is taken to be [P], the non-oriented electromagnetic steel sheet has a chemical composition that satisfies (2 × [Mn] + 2.5 × [Ni] + [Cu]) - ([Si] + 2 × [sol. Al] + 4 × [P]) ≥ 1.50%. A411-011 is 15.0% or more, B50D is 1.70T or more, and W10D / 400D is 10.4 W / kg or less.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Magnetic head and production of same

    JP1977056916A

  • Method for producing non-oriented magnetic steel sheet having high magnetic flux density

    JP2011111658A

  • Electromagnetic steel sheet, and method for producing the same

    JP2017145462A

  • Nonoriented electromagnetic steel sheet

    JP2019183185A

  • Non-oriented electromagnetic steel sheet

    JP2020076138A