Title:
SOFT MAGNETIC IRON ALLOY PLATE, METHOD FOR MANUFACTURING SOFT MAGNETIC IRON ALLOY PLATE, AND IRON CORE AND ROTATING ELECTRIC MACHINE EMPLOYING SOFT MAGNETIC IRON ALLOY PLATE
Document Type and Number:
WIPO Patent Application WO/2022/230317
Kind Code:
A1
Abstract:
Provided are: a soft magnetic iron alloy plate exhibiting a higher saturation magnetic flux density than an electromagnetic pure iron plate without excessively increasing the iron loss; a method for manufacturing said soft magnetic iron alloy plate; and an iron core and a rotating electric machine employing the soft magnetic iron alloy plate. A soft magnetic iron alloy plate according to the present invention is characterized by having a chemical composition in which 2-10 atm% of N, 0-30 atm% of Co, and 0-1.2 atm% of V are contained and the remainder consists of Fe and impurities and by having, in the thickness direction of the soft magnetic iron alloy plate: an outside nitrogen-concentration transition region in which the N concentration of a principal surface is 1-4 atm% and the N concentration increases inward from the principal surface; a high nitrogen concentration region in which a maximum N concentration is higher than the N concentration of the principal surface and less than 11 atm% and the fluctuation range of the N concentration is within 1 atm%; and an inside nitrogen-concentration transition region in which the N concentration decreases inward from the high nitrogen concentration region and a minimum N concentration is lower than the N concentration of the high nitrogen concentration region and equal to or higher than 1 atm%.
Inventors:
KOMURO MATAHIRO (JP)
TABATA TOMOHIRO (JP)
TAMURA SHINYA (JP)
ASARI YUSUKE (JP)
TERADA SHOHEI (JP)
TABATA TOMOHIRO (JP)
TAMURA SHINYA (JP)
ASARI YUSUKE (JP)
TERADA SHOHEI (JP)
Application Number:
PCT/JP2022/006619
Publication Date:
November 03, 2022
Filing Date:
February 18, 2022
Export Citation:
Assignee:
HITACHI LTD (JP)
International Classes:
C21D3/08; C21D1/06; C21D1/18; C21D1/76; C21D6/00; C22C38/00; H01F1/147; H01F1/16; H01F27/245
Foreign References:
| JP2018076557A | 2018-05-17 | |||
| JPS5278615A | 1977-07-02 | |||
| JP2018044212A | 2018-03-22 | |||
| JP2003277893A | 2003-10-02 |
Attorney, Agent or Firm:
POLAIRE I.P.C. (JP)
Download PDF: