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Cores of magnetic circuits are a very important part for transformers production and their quality is crucial for the final parameters of magnetic circuit.

A transformer core consists of a magnetic circuit where its induction flux caused by the current passage flowing through the primary coiling induces electric voltage in the secondary coiling.

Wound transformer cores are used as compact cores (toroids) or as cores with air-gaps. Liberty Technotron s.r.o. produces cores from grain oriented transformer metal band with silicium alloyed Goss texture of about 3 %, thickness range form 0.15 to 0.35 mm.

General specification used paterial for processing according IEC 60404-1;2000

Mark Material Thickness
C22 Fe 3% Si 0,15 – 0,35 mm
  • Transmission transformers
  • Instrument transformers
  • Measurement transformers
  • Voltage transformers
  • Current transformers
  • Supply transformers
  • Power transformers
Production process of magnetic cores


Magnetic properties of transformer cores are directly depended on band quality and thickness used for production. The cores are tested individually and every core which is leaving the production is measured for provide the 100% quality of each delivery.

Measuring process is operated and scanned by technological computer. This computer evaluates following values:

effective value non-sinusoidal actuating current Tµ[A]
intensity of magnetic field Hef[A/m]
magnetic induction Bmax[T]
apparent power S[VA]
active input (losses) P[W]
amplitude permeability µ

These values are measured fluently in whole range of alternating magnetizing characteristic just limited to maximum power exciter circuit of measuring instrument.

Accessories: Laminations

Our company offer wide range of lamination.

Delivery options:

assembled stacked together by fixing tape
fixed together by special tape with fiber glass
non assembled goods in bulk


Material used: All type of Si steel


Our production range: Minimum (mm) Maximum (mm)
Thickness 0,18 0,35
Width 15 400
Length 80 2000


Differences on strip width: +/- 0,2 mm
Linearity on length=1500mm +/- 0,8 mm
Edge burr: +/- 0,02 mm


After mutual agreement, we can also offer lamination with wide range of holes.

Accessories: Laminations with holes

We are able to offer all laminations in version with holes. Holes we are able to place anywhere along the center line.

Offered punching dimensions:

8.0 mm, 10.2 mm, 14.5 mm, 16.0 mm, 20.0 mm, 24.0 mm


Our production range Minimum (mm) Maximum (mm)
Thickness 0,18 0,35
Width 40 400
Length 80 2000
Our tolerances
Width tolerance +/- 0,2 mm
Length tolerance +/- 0,8 mm
Burr +/- 0,02 mm

Martin Hradil

t: +420 558 629 233