GM54DC

Magnetic properties of toroidal encapsulated magnetic cores from amorphous and nanocrystalline alloys

GAMMAMET® 54DC

The magnetic cores GÀÌÌÀÌÅÒ® 54DC are made from 25 microns thick ribbon of soft magnetic nanocrystalline alloy on a Fe–basis. The ribbon is produced by technology of molten metal rapidly quenching. Magnetic cores GM 54DC have at least one air cut gap. Over a core the covering from polymer material is put. The encapsulated cores have enhanced strength and can be used without protective boxes.

The various sizes of cores are available with outer diameter up to 600 mm. The magnetic cores GÀÌÌÀÌÅÒ® 54DC are used in frequency range up to 10 MHz.

Sizes list of magnetic cores DC you can see in Table 2. Weight and geometrical sizes of toroidal encapsulated magnetic cores

Class of thermal stability is A (105°C) or F (155°C).

The service life of cores is 30 years.

Magnetic cores GM 54DÑ substitute for magnetodielectics on basis of sendust and permalloy and for ferrite cores with air cut gap. The specification TU 1261-032-12287107-2008 assures the following permeability:

Class of magnetic core Initial relative magnetic permeability
Nominal Limit deviation
30 30 25÷35
40 40 35÷50
60 60 50÷75
90 90 75÷110
140 140 110÷170
200 200 170÷220
250 250 220÷290
350 350 290÷400
500 500 400÷600
700 700 600÷850
1000 1000 850÷1200

Notation: At a core choice it is necessary to consider following relation. Initial permrability of core can be no more than value calculated under the formula µí=200 S-0,39 lñð, where S - cross-sectional area of core (m2), lñð - average magnetic path length (m). As an example admissible values of initial permeability are more low under the text resulted for some types of magnetic core GM54DC.

  • Ê25×15×10 – µí íå áîëåå 600;
  • Ê32×20×10 – µí íå áîëåå 700;
  • Ê45×28×10 – µí íå áîëåå 900;
  • Ê64×40×10 – µí íå áîëåå 1100;
  • Ê175×130×20 – µí íå áîëåå 1900;

Use area: reactors, choke filters, accumulation transformers, high-frequency transformers, pulse transformers

GAMMAMET® owns following patents of Russia which are used at manufacture of magnetic cores GM54DC: 2009258, 2033649, 2117714, 2044796.

The detailed information about magnetic properties of GM501 can be found in the book: Starodubtsev J.N., Belozerov V.J. "Magnetic properties amorphous and nanocrystalline alloys"

Numerical values of magnetic properties in DC magnetic cores correspond to geometric cross-sectional area or volume of a core. And thus in electrotechnical calculations the lamination factor of core is accepted to equal unit.

Typical physical properties
Magnetic induction of saturation 0,8 T
Squareness ratio Âr/Â800 <0,01
Saturation magnetostriction 1,5×10-6
Specific electroresistance 1,25×10-6 Om×m
Density 5200 kg/m3
Curie temperature 600°C
Temperature coefficient of permeability in range from -60°C to +125°Ñ 0,02%×K-1
Specific core losses P (W/m3) at frequency 3<f<200 kHz
Relative magnetic permeability Bm<0,1 T Bm>0,1 T
30 7f1,48Bm2,05 4,4f1,48Bm1,85
60 4,8f1,48Bm2,05 3f1,48Bm1,85
90 3,6f1,48Bm2,05 2,3f1,48Bm1,85
140 2,9f1,48Bm2,05 1,8f1,48Bm1,85
250 2,4f1,48Bm2,05 1,5f1,48Bm1,85
350 2,1f1,48Bm2,05 1,3f1,48Bm1,85
500 1,8f1,48Bm2,05 1,15f1,48Bm1,85
700 1,6f1,48Bm2,05 1,0f1,48Bm1,85
1000 1,5f1,48Bm2,05 0,9f1,48Bm1,85
f – frequency (Hz), Âm – maximum magnetic induction (T)

Static curves of magnetization