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    Cores of magnetic circuits

    make a very important part for transformers production... Cores of magnetic circuits
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    Toroidal Cores

    Toroidal core is basically wounded grain oriented silicon strip containing approximately 3% of silicium to the circle or other form.. Toroidal Cores
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    Cut C Cores

    Wound transformer cores are manufactured in process of winding up the transformer strip on a mandrel followed by the processes.. Cut C Cores
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    Unicore cores

    UNICORE constitute a new line of cores of magnetic circuits. Unicore cores

MATERIALS USED FOR MANUFACTURING OF TOROID CORES, WOUND CORES AND UNICORE CORES OPERATING AT FREQUENCY OF 50 HZ

The selection of optimal thickness of an GO band is based on the fact that smaller is the thickness lower are the hysteresis losses. On the other hand specific losses caused by eddy current decrease of the sheet thickness by a quadrate. The total of both losses results in significant minimum of total specific losses for range of band thickness from 0.23 to 0.35 mm and 50 Hz frequency.

Wound cores of magnetic circuits produced by ArcelorMittal Technotron s.r.o. Company are manufactured form grain oriented transformer metal band with oriented structure. Thanks to this oriented structure these materials provide high magnetic orientation and are divided to several qualities, as you can see in the table below.

Nominal
Nominal thickness
( mm )
Quality Max.
specific losses
( W/kg )
Min.
magnetic induction
( T )
EN 10107 DIN 46400 AISI P1,5/50Hz P1,7/50Hz B800
0,23 M127 - 23S   23M3 0,8 1,27 1,75
0,27 M140 - 27S VM 89 - 27N 27M4 0,89 1,40 1,75
0,30 M150 - 30S VM 97 - 30N 30M5 0,97 1,50 1,75
0,35 M165 - 35S VM 111 - 35N 35M6 1,11 1,65 1,75
0,23 M110 - 23S 0,73 1,1 1,78
0,23 M120 - 23S 0,77 1,20 1,78
0,27 M130 - 27S VM 130 - 27S 0,85 1,30 1,78
0,30 M140 - 30S VM 140 - 30S 0,92 1,40 1,78
0,35 M150 - 35S VM 155 - 35S 1,05 1,50 1,78
0,23 M 100 - 23P 1,00 1,85
0,27 M 103 - 27P 27MOH 1,03 1,88
0,30 M 105 - 30P 30MOH 1,05 1,88
0,30 M 111 - 30P VM 111 - 30P 30M1H 1,11 1,88
0,30 M 117 - 30P VM 117 - 30P 30M2H 1,17 1,85

 

Graph dependence

 

Graph dependence

 

Graph dependence

 

Graph dependence

 

Graph dependence

 

Graph dependence

 

FREQUENCIES OF 400 – 1000 HZ

To be able minimize weight and volume of magnetic circuits we need to increase frequency of supply voltage. When the supply voltage frequency increases we are able to decrease the magnetic circuit cross-section and consequently its weight and volume. Upon customer request we manufacture wound magnetic circuits from Fe - 3% Si band, nominal thickness 0.15 mm, band thickness 0.10 mm possible.

Elementary material properties as follows:

Nominal
thickness
( mm )
Magnetizing
frequency
[Hz]
Nominal losses
[W/kg]
Magnetic polarization
J [T]
at the magnetic field intensity
H [A/m]
Initial permeability at magnetic field intensity
P1,0 P1,5 P1,7 30 800 2500 10000 0,4
A/m
1,6
A/m
0,15 50 0,32 0,75 1,20 1,25 1,84 1,92 1,98 4000 8000
400 7,00 15,00   0,65 1,83        
0,10 50 0.55 1,20 2,20 1,00 1,80 1,90 1,97 500 1000
400 7,00 15,00   0,45 1,80        

 

The band used is ceramic insulated on both sides with the heat resistance up to 900 °C. Corresponding specific losses at frequency of 400 Hz/1T are 8 – 8.5 W/kg.

Magnetic wound circuits made of 0.15 mm material are cost-effective for electrical machinery producers even though the fact that when compared with the C/0.30 mm cores their price is about 100 % higher.