ISOMATIC manufactures a range of C-cores (wound tape cores) for mains transformers to DIN 41309/IEC 329 specifications. You can see the main dimensions of these from the table below.
C-cores are wound from grain oriented silicon steel strips, annealed, impregnated and cut into two halves. They are very suitable for small mains transformers, exhibiting low noise, low magnetizing current, fast assembly of transformers, hence low cost of the final product.
Each pair is tested and marked for optimum performance.
C-cores, toroidal cores, epoxy coated toroidal cores and some types of stacked cores are manufactured with dimensions to customer specifications too.
The table contains the dimensions of the C-cores
which Isomatic can produce for you.
|*||SL 25x25 - 2off + SL 25x50 - 2off|
|**||PL 20x20 - 80 - 2off + PL 20x40 - 80 - 2off|
|***||PL 20x20 - 80 - 2off + PL 20x40 - 80 - 4off|
|****||PL 20x20 - 80 - 2off + PL 20x40 - 80 - 6off|
|*****||PL 20x20 - 80 - 2off + PL 20x40 - 80 - 8off|
Isomatic operates a production line for C-cores and here the main stages are explained:
The strips are wound on special tools with the necessary core dimensions according to the standards and user’s specifications.
To relieve the mechanical stresses after winding and improve the magnetic properties the cores are annealed. Annealing of the cores takes place in a tunnel furnace with a temperature 810 +10 oC. This allows precise control of the core’s mechanical dimensions and magnetic properties. The cores are then cooled in a pater noster
The cores are immersed in liquid enamel under vacuum and cured subsequently to become a single solid part.
IV. Material properties & specifications
We use cold rolled silicon steel. It has very high magnetic permeability at the direction of rolling which allows high values of the flux density within the core. Wound C-cores are very suitable for applications which require high flux densities because they provide small resistance for the magnetic flux along its way - the direction of the magnetic flux coincides with the direction of rolling. Thus a light and compact transformer can be designed.
For more information or orders e-mail to firstname.lastname@example.org.
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