Toroidal Cores

General description

Dimension min. (mm) max. (mm)
D outer diameter 27 800
d inner diameter 17 500
h core heigh 10 180
Sh chamfered edge *) 2×45° 5×45°

*) 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 – normal 0,050 min 1,30 black
S – standart 0,075 min 1,40 red
SU – super 0,110 min 1,60 green
SU-EX – extra selection* 0,130 min 1,70 white

*) 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 ± 0,5 to 50 ± 0,75
50 – 100 ± 0,75 50 – 100 ± 1
100 – 150 ± 1 100 – 150 ± 1,2
150 – 300 ± 1,2 150 – 300 ± 1,5
300 – 400 ± 1,5 300 – 400 ± 1,75
400 – 500 ± 2 400 – 5000 ± 2
500 – 800 ± 2,5 500 – 800 ± 3
800 – 1000 ± 3 800 – 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

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

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

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

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

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.