Patent ID: 11962184
Assignee: JFE STEEL CORPORATION
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  H  B  Y | IPC B  C  H

Claim 16:
17. A motor core constituted with
a rotor core made of a non-oriented electrical steel sheet having a component composition comprising C: not more than 0.0050 mass %, Si: 2.8 to 6.5 mass %, Mn: 0.05 to 2.0 mass %, P: not more than 0.10 mass %, S: not more than 0.0050 mass %, Al: 0.3 to 2 mass %, N: not more than 0.0050 mass %, Zn: 0.0005 to 0.0050 mass %, Ti: not more than 0.0030 mass %, Nb: not more than 0.0030 mass %, 0: not more than 0.0050 mass %, satisfying Si+Al≥4 mass % and the remainder being Fe and inevitable impurities and
a stator core made of the same non-oriented electrical steel sheet,
characterized in that
the steel sheet constituting the rotor core has a yield stress of not less than 480 MPa;
N1, N2 and t in the steel sheet constituting the stator core satisfy the following equation (2):

(t×N2)/{(t/10)×N1}≥5.0  (2),, where N1 (mass %) is a content of nitrogen present as AlN (N as AlN) in a layer from a one-side surface to 1/20 of a sheet thickness and N2 (mass %) is a content of nitrogen present as AlN in a full sheet thickness (N as AlN) and t (mm) is a sheet thickness of the steel sheet; and, an iron loss W10/400 (W/kg) satisfies the following equation (3) in relation to the sheet thickness t (mm):

W10/400≤8+20×t  (3).