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

1. A method for producing soft magnetic strip material for roll tape-wound cores comprising:

preparing a band-shaped material;

heat-treating the band-shaped material at a heat-treatment temperature, wherein the heat-treatment temperature is below a crystallization temperature of the band-shaped material for maintaining an amorphous state of the band-shaped material;

applying a tensile force during the heat-treating step to the heat-treated band-shaped material in the longitudinal direction of the band-shaped material 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 during the step of applying the tensile force, measurement values of the soft magnetic strip material that have been produced, wherein said measurement values include a magnetic saturation flux, an anisotropy field intensity, and a magnetic tape cross-sectional area; and

controlling and setting the tensile force during the step of applying the tensile force to the heat-treated band-shaped material and in direct response to the measurement values determined during the step of applying the tensile force, to thereby control the permeability of the soft magnetic strip.

2. The method according to claim 1 , wherein the controlling the tensile force comprises varying the tensile force such that the tensile stress in the longitudinal direction of the band-shaped material is kept essentially constant at least in segments along the longitudinal direction, or wherein controlling the tensile force comprises an automatic setting of the tensile stress by a predefined tensile stress setpoint, or both.

3. The method according to claim 1 , further comprising applying a magnetic field to the heat-treated band-shaped material.

4. The method according to claim 1 , further comprising the winding-on of at least one defined section of the produced soft magnetic strip material for producing at least one annular tape-wound core, following the determining the at least one magnetic measurement value.

5. The method according to claim 4 , wherein the winding-on is controlled in response to the at least one magnetic measurement value.

6. The method according to claim 4 , wherein the winding-on comprises winding on a pre-determined number of tape layers of the soft magnetic strip material produced for making at least one annular tape-wound core, and pre-determining the number of tape layers in response to the at least one magnetic measurement value.

7. The method according to claim 6 , wherein the number of tape layers is varied such that at least one of a cross-sectional area A Fe1 or a permeability of a first annular tape-wound core and at least one of a cross-sectional area A Fe2 or a permeability of a second annular tape-wound core are approximately the same.

8. The method according to claim 1 , wherein the band-shaped material comprises rapidly solidified magnetic material with at least one component selected from the group consisting of amorphous Co alloys, Co—Fe alloys, Co—Ni alloys, Fe alloys, and Fe—Ni alloys, wherein for Co, Co—Fe and Co—Ni alloys.

9. The method according to claim 1 , comprising the further step of measuring at least one additional magnetic measurement value selected from the group consisting of the permeability, the coercive field intensity, and the remanence ratio of the produced soft magnetic strip material.