Method and device for producing soft magnetic strip material for strip ring cores

A method for producing an annular tape-wound core, the method comprising:

• preparing a band-shaped material;
• heat-treating the band-shaped material at a heat-treatment temperature;
• applying a tensile force to the band-shaped material in a longitudinal direction of the band-shaped material during the heat-treating in order to produce a tensile stress in the band-shaped material, thereby producing a soft magnetic strip material from the band-shaped material;
• determining at least one first measurement value and a second measurement value of the band-shaped material during the heat-treating and while applying the tensile force, the at least one first measurement value representing at least one magnetic parameter and the second measurement value representing a local magnetic cross-sectional area;
• controlling, within a production line, the permeability of the band-shaped material by controlling the tensile force in response to the at least one first measurement value during the heat-treating and while applying the tensile force;
• and
• winding the soft magnetic strip material after the heat-treating to form the tape-wound core, wherein a wound up length of the magnetic strip material equals a strip length that has been determined, before the winding, based on the second measurement value.