Rectangular Core

Application

      Rectangular cores are used in power transformers, current transformers, transducers and provide a solution to the mechanical limit by the other special applications.

Advantages

      - Closed magnetic path;

      - Low core loss and humming;

      - Low magnetic leakage and remanence;

      - High magnetic flux density;

      - High permeability;

Material

      High quality silicon steels with high permeability, low core loss and remanence.

      Ultra-thin: 0.05mm, 0.08mm, 0.10mm from Japan.

      Normal: 0.23mm, 0.27mm, 0.30mm.

      Supplier: Baosteel,Shougang, Nippon-steel, JFE and POSCO.

Capacity

Limit dimensions:

      Min. width: 5 mm;

      Max. strip width: 300 mm;

      Min. inside window size: 10*6 mm;

      Min. weight: 5 Grams/ core

      Max. weight: 500 Kgs/ core

Main processes:

      Slitting -> Winding -> Annealing -> Varnish->Testing

Optional finishes:

      - Varnish;

      - Epoxy coating;

      - Black paint;

Capacity of winding:

      - Outside window < 60*30: 5000 pcs/Day;

      - Outside window < 100*40: 3000 pcs/Day;

      - Outside window > 100*40: 1000 pcs/Day;

Technical

      Rectangular core weight calculation formula

      Weight per core = 7.65*E*D*Sf*(2G+2F+πE-1.72R)*10-6(Kgs)

      In which,

      E = Stacking thickness;

      D = Strip width;

      G = Inside window height;

      F = Inside window width;

      R = Inside corner Radius;

      Sf = Stacking factor, 0.05mm material: 0.88 ~ 0.90;

                                        0.08mm material: 0.89 ~ 0.91;

                                        0.10mm material: 0.90 ~ 0.92;

                                        0.18mm material: 0.94 ~ 0.95;

                                        0.23mm material: 0.95 ~ 0.96;

                                        0.27mm material: 0.96 ~ 0.97;

                                        0.30mm material: 0.96 ~ 0.97;

Standards

      The cores can be produced according to IEC60635, other country standards and also customized requirements.

Quality control

      - On magnetic and mechanical quality control of silicon steel;

      - On physical dimension control of wound cores;

      - On annealing process;

      - On Varnish process;

      - On dimensions and magnetic values of finished cores;

      - On packaging.