*) by customer request
- measurement transformers
- power and regulating transformers
- 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
|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|
|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 core is basically wounded grain oriented silicon strip containing approximately 3% of silicium to the circle or other form.
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.
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 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 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.