TAPE CORE Russian patent published in 2023 - IPC H01F27/245 H01F1/147 C22C38/02 C21D8/12 

FIELD: electrical engineering.

SUBSTANCE: strip core comprises a substantially rectangular strip core body in side view. The main body of the strip core includes a portion in which the anisotropic electrical steel sheets in which the flat portions and the corner portions are continuously alternated in the longitudinal direction, and the angle formed by the two adjacent flat portions, with each of the corner portions between them, is 90°, are laid in the thickness direction of the sheet, and has a substantially rectangular laminated structure in side view. Each of the corner portions has two or more curved portions having a curved shape in a side view of the anisotropic electrical steel sheets, and the sum of the bending angles of the curved portions in one corner portion is 90°. Each curved part in the side view has an internal radius of curvature r of 1-5 mm. Sheets of anisotropic electrical steel have a chemical composition containing, wt.%, Si: 2.0-7.0%, with a residue of Fe and impurities, and a texture oriented in the Goss orientation. More than half of the measured values obtained at a variety of different positions along the thickness of the laminate are 0.20-0.70 for the interlayer friction coefficients, which are the dynamic coefficients of friction of the laminate anisotropic electrical steel sheets in at least some of the flat parts, and their average the value is 0.20-0.70.

EFFECT: reducing the noise in the core.

3 cl, 7 dwg, 7 tbl