Tape wound cores are wound from soft magnetic alloy tape, magnetically finish annealed, then solidified with special adhesive, then cut into at least two pieces.
Along with laminations and torodial cores, they are classics for building transformers, transducers, chokes and converters.
In addition to standard products, we also supply customized cores according to drawings, e.g. with several cuts. The standard delivery program includes cuts such as SE, SU, SM and SG cores.
Fastening material, such as angles and clamping straps are available on request.
A disordered atomic structure without crystalline regions and grain boundaries is characteristic of amorphous alloys. This is a basic prerequisite that favors soft magnetic behavior.
From Spektrum der Wissenschaft 7 / 1994, page 108:
"It is not at all easy to produce a metallic solid in which disorder prevails down to the smallest detail. While a melt solidifies during cooling, the metal atoms generally have enough time to form crystal nuclei, which grow locally into microcrystals. Only if the melt is cooled extremely quickly - for example, at one million degrees per second - does an amorphous solid form. As with glass, the atoms then remain in a largely disordered state.
Solidification in fractions of a second
… To achieve cooling rates of one million degrees per second, however, its thickness must be well below 0.1 millimeters. This is essentially controlled by the roll speed: 0.02 to 0.04 millimeters can be achieved at 20 to 50 meters per second. The dimensions of the casting nozzle and the chill roll determine the film width.
Soft against changing magnetic fields
… This is most noticeable when the magnetic field direction changes again. In a metal with a lattice structure, it often takes more energy to restore the original state. Initially, a residual magnetization remains, which is called remanence. An additional field force - the coercivity - is required to bring the magnetic moments back to their original state. For applications in alternating fields, soft magnetic materials that remagnetize even in weak fields are therefore preferred. These include amorphous metals and nickel-iron alloys.
Soft magnetic iron-amorphous strips, produced using rapid solidification technology, are used for the production of amorphous cut and toroidal strip cores.Cut strip cores
The starting material is iron amorphous strip produced using the Rachstarrung technology. The amorphous ribbons are subjected to an additional heat treatment at 500 to 600°C to enable the formation of a fine-grained microstructure. The term nanocrystalline refers to an achieved grain size in the range of 10nm.
Soft magnetic nanocrystalline tapes are used for the production of nanocrystalline cut and toroidal tape cores
Materials Cut strip cores
Here you can find downloads for our different cut tape cores