STRIP CORE, METHOD FOR MANUFACTURING STRIP CORE, AND DEVICE FOR MANUFACTURING STRIP CORE Russian patent published in 2024 - IPC H01F27/245 H01F3/04 H01F41/02 

FIELD: electrical engineering.

SUBSTANCE: strip core (10) includes a rectangular hollow portion at the centre and a portion in which grain-oriented electrical steel sheets, where flat portions and curved portions are alternately continuous in the longitudinal direction, are stacked on top of each other in the thickness direction of the sheet, which constitutes the strip core, formed by laying sheets of grain-oriented electrical steel that have been separately bent, layered and assembled into a strip form. On the end surface of the strip core, which is in the sheet thickness direction of grain-oriented electrical steel sheets (1) and parallel to the longitudinal direction of the grain-oriented electrical steel sheets, in the stacking direction, when the surface roughness of a portion of the steel sheet in the direction connecting the centre in the sheet thickness direction of sheet (1) of grain-oriented electrical steel located at the innermost periphery of the strip core among stacked grain-oriented electrical steel sheets (1), and the centre in the sheet thickness direction of grain-oriented electrical steel sheet (1) located at the outermost periphery of strip core (10) is equal to Ral, and the surface roughness of grain-oriented electrical steel sheet (1) in the direction parallel to the longitudinal direction on the end surface of flat portion (4) of laid grain-oriented electrical steel sheet (1) is Rac. The ratio Rаl/Rаc between Rаl and Rаc satisfies the ratio 1.5≤Rаl/Rаc≤12.0.

EFFECT: reduced temperature of the core and the winding wire.

3 cl, 12 dwg, 3 tbl