Magnetic cores from electrical steel

Magnetic cores GAMMAMET®

Magnetic properties of toroidal magnetic cores from electrical steel

GAMMAMET® 29 and 27

Toroidal ribbon core GAMMAMET® 29 are made from grain oriented electrical steel of thickness 0.30 mm and GÀÌÌÀÌÅÒ® 27 - from grain oriented electrical steel of thickness 0.08 mm. Magnetic cores are supplied with heat treatment for removing of residual stresses after cutting and winding.

Magnetic cores from electrical steel can be delivered with a polymer covering. Code of magnetic cores with covering are GM 29D and GM 27D.

Magnetic core from electrical steel:

  1. Ribbon magnetic core,
  2. Polymer covering.

Use area: measuring current and voltage transformers, power transformers, matching transformers.

Typical physical properties
Magnetic induction of saturation 2,03 T
Coefficient of heat conduction 25 W/m×Ê
Specific electroresistance 0,5×10-6 Om×m
Density 7650 kg/m3
Curie temperature 740°C
Temperature coefficient of linear expansion 1·10-5 Ê-1

It is possible to choose a size of magnetic core GM 29 from the table for designated power of transformer at frequency 50 Hz.

Power of transformer, V×A Magnetic core Sizes of magnetic core, mm
Inner diameter Outer diameter Height
6,3 OL25/45–15 25 45 15
10 OL25/45–20 25 45 20
12 OL32/50–20 32 50 20
16 OL35/55–20 35 55 20
20 OL30/45–40 30 45 40
25 OL40/65–20 40 65 20
40 OL50/70–25 50 70 35
50 OL50/80–20 50 80 20
63 OL55/80–25 55 80 25
75 OL40/64–40 40 64 40
100 OL60/90–30 60 90 30
120 OL50/80–40 50 80 40
160 OL60/100–30 60 100 30
250 OL70/110–40 70 110 40
400 OL80/120–50 80 120 50
630 OL90/140–50 90 140 50
1000 OL100/150–60 100 150 60
1600 OL110/170–70 110 170 70
2500 OL120/190–80 120 190 80
4000 OL140/215–100 140 215 100