CORES OF MAGNETIC CIRCUITS
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 |
We offer this type of transformer cores
- Transmission transformers
- Instrument transformers
- Measurement transformers
- Voltage transformers
- Current transformers
- Supply transformers
- Power transformers
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.
Our company offer wide range of lamination.
Delivery options:
| assembled | stacked together by fixing tape |
| glued | |
| 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 |
| Tolerances | |
|---|---|
| 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.
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 |
