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)
  • single-phase
  • three-phase
  • 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.

C-core examples:

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.