GM40BDC
Magnetic properties of toroidal encapsulated magnetic cores from amorphous and nanocrystalline alloys
GAMMAMET® 40BDC
Magnetic cores GAMMAMET® 40BDC are made from 25 microns thick ribbon of soft magnetic amorphous alloy on a Fe–basis. The ribbon is produced by technology of molten metal rapidly quenching. After heat treatment in transverse magnetic field the cores have high linearity of magnetization curve, low remanent induction and low core losses. 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 140 mm. The magnetic cores GAMMAMET® 40BDC are preferably used in frequency range up to 200 kHz.
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 GAMMAMET® 40BDÑ substitute for cores of soft magnetic nickel-iron alloys and ferrites with linear magnetization curve. The specification TU 1261-031-12287107-2008 assures the following magnetic propperties:
| Magnetic core | Squareness ratio Êï800, no more | Initial relative magnetic permeability, no less | Coercive force, À/ì, no more | Magnetic induction Â800, T, no less |
|---|---|---|---|---|
| GM 40ÂDC | 0,2 | – | 15 | 1 |
Use area: power transformers, matching transformers, pulse transformers, wide-range transformers.
GAMMAMET® owns following patents of Russia which are used at manufacture of magnetic cores GM 40ÂDC: 2041512, 2149473.
The detailed information about magnetic properties of GM 40ÂDC 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.
| Magnetic induction of saturation Â800 | 1T |
|---|---|
| Initial relative magnetic permeability | 3000 |
| Maximal relative magnetic permeability | 7000 |
| Coercive force | 8 A/m |
| Squareness ratio Âr/Â800 | 0,15 |
| Saturation magnetostriction | 25×10-6 |
| Specific electroresistance | 1,3×10-6 Om×m |
| Density | 5100 kg/m3 |
| Curie temperature | 420°C |
| Specific core losses at frequency f<3 kHz | |
| P=24f1,1Bm1,6 (W/m3) | |
| Specific core losses at frequency 3<f<200 kHz | |
| P=0,54f1,6Bm2 (W/m3) | |
| f – frequency (Hz), Âm – maximum magnetic induction (T) | |
Loop of a magnetic hysteresis
Curves of magnetization
Magnetic permeability
