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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

Toroidal Cores

Producing assortment

- General description

Drawing
Dimension min. (mm) max. (mm)
D
outer diameter
27 800
d
inner diameter
17 500
h
core heigh
10 180
Sh
chamfered edge*
2x45° 5x45°

* by customer request

 

Application possibilities of toroidal cores

▪ measurement transformers
▪ power and regulating transformers
▪ inductors
▪ transducers

 

BENEFITS OF TOROIDAL CORES

▪ Close flux path
▪ Low magnetic leakage
▪ Low humming
▪ Compact dimensions
▪ Light weight

 

The table of toroidal cores qualities

Quality Typical values
Bmax ( T ) **
Heff = 3A/m
Guaranteed values
Bmax ( T )
Heff = 30A/m
Colour marking
***
N - normal0,050min 1,30black
S - standart0,075min 1,40red
SU - super0,110min 1,60green
SU-EX - extra selection *0,130min 1,70white

*  quality SU-EX – by customer’s request
**  typical values – by customer’s request
***  colour marking - by customer’s request

 

The tolerance of toroidal cores dimensions

Inner
diameter
Acceptable
deviation
Outer
diameter
Acceptable
deviation
to 50± 0,5to 50± 0,75
50 - 100± 0,7550 - 100± 1
100 - 150± 1100 - 150± 1,2
150 - 300± 1,2150 - 300± 1,5
300 - 400± 1,5300 - 400± 1,75
400 - 500± 2400 - 5000± 2
500 - 800± 2,5500 - 800± 3
800 - 1000± 3800 - 1000± 3,5

 

Core height

Band width Acceptable deviation
to 50 mm ± 0,2
from 50 mm ± 0,3

 

Toroidal cores are supplied in different types of construction and in different types of quality according to used base material.

 


Types of toroidal cores

- toroidal cor

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

 

- toroidal core with chamfered edges

Photo Toroidal cores can be chamfered on the inside and outside edges and make possible to wound the coil without using protective capping strip. Another advantage of chamfered edges is to eliminate possibility of breakage the banding and also to eliminate possibility of breakage the winding.

 

- toroidal core with protective coating

Photo Due to customer wish the cores can be supplied with protective lamination, so called KOMAXIT. These cores can be also in combination with chamfered edges. This brings a big advantage because you can wound winding without using protective capping strip. Also you don’t have to band the cores before wound base threads. Another big advantage of protective coating is hardening of the core therefore the cores are more resistant against mechanical influence and better stability of magnetic properties.

 

- toroidal core with air gaps

Photo Toroidal cores with air gap can be produced with exactly defined one or more air gaps. These cores are usually used for chokes, combined instrument transformers and also for transformers for audio technology (e.g. amplifiers).

 

- toroidal core of special shapes

Photo Toroidal cores of special shapes are produced due to customer requirements and can be cone, elliptical, ovoid shapes and so on. These cores are usually used for illuminating and measurement engineering.

BEFORE SHIPMENT ALL CORES ARE RE-MEASURED, WE PROVIDE THE ELECTROMAGNETIC VALUES ATTEST UPON CUSTOMER’S REQUEST.