TAPE-WOUND CORE Russian patent published in 2024 - IPC H01F27/245 H01F41/02 H01F3/04 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering, namely to tape-wound core. Tape-wound core comprises a hollow section in the centre and a section in which sheets of textured electrical steel are laid on top of each other in the direction of the sheet thickness. Sheets of textured electrical steel have flat sections and bent sections extending alternately in longitudinal direction. Tape-wound core forms a rectangular shape having four angular sections, including bent sections, by laying sheets of textured electrical steel, each of which is obtained by bending, layers and assembling sheets of textured electrical steel into a wound state, in which a plurality of sheets of textured electrical steel are connected to each other through at least one connection section for each winding, and the sum of the bending angles of the curved portions in each of the four corner portions is 90 degrees. Corresponding bent sections of sheets of textured electrical steel are laid on top of each other in layers in direction of sheet thickness to form one bent area. In a side view of the tape-wound core, in at least one arbitrary curved area in four corner sections, when P represents, in the innermost sheet of textured electrical steel in a plurality of sheets of textured electrical steel, laid in layers, the point of intersection of the drawn line passing along the inner surface of the flat section to the angular section and the drawn line passing along the inner surface of the flat section between the bent sections forming the angular section. Q represents, in the outermost sheet of textured electrical steel in a plurality of sheets of textured electrical steel, laid in layers, the point of intersection of the drawn line passing along the outer surface of the flat section to the angular section and the drawn line passing along the outer surface of the flat section between the bent sections forming the angular section. R represents the point at which a straight line passing through the point of intersection represented by P and passing in a direction perpendicular to the direction of passage of each of the plurality of sheets of textured electrical steel to the corner portion, crosses the outer surface of the outermost sheet of textured electrical steel, angle θ formed by straight line PQ and straight line PR, satisfies 23°≤θ≤50°.

EFFECT: reduced losses in core without annealing.

3 cl, 14 dwg