Wound divided cores (C-cores)
C-cores are produced by winding a strip of CRGO steel on a rotating mandrel. After having been wound and glued by a epoxy resin, the core is then cut into a few pieces.
C-cores properties depand on the following factors:
- Geometry of magnetic cores
- The size of air gap between cutted surfaces
- Quality of used CRGO steel
C-cores can be produced in different types and shapes:
- one step (one strip width)
- cruciform (few steps/different widths)
- circular, oval or rectangular shape
The quality of cutted surfaces is very important for function of final C-core (transformer):
- common quality of cutted surfaces up to 30 μm TYPE "A".
- grinding cutted surfaces TYPE "C", done on grinding machine
To measure magnetic properties of C-cores, we are equipped with special instruments. We do 100% tests of all our cores and the measuring process is controlled and recorded.
The following properties are evaluated:
- Intensity of the magnetic field Heff (A/m)
- Magnetic induction Bmax. (T)
- Core losses P (W)
- Amplitude permeability etc.
For the cores wound from the tape thickness of 0.35 (grade N) maximum allowed measuring losses and intensity of magnetic induction Bmax = 1,5T and frequency 50 Hz in four groups according to the following table are guaranteed:
For all types of cores manufactured from strip of thickness 0.27 – 0.30 mm (grade S) the highest permitted values of the specific losses 2.2 W/kg at magnetic induction Bmax = 1.7 T and frequency 50 Hz and max. Heff 250 A/m are guaranteed.
More details in product catalogue.