Cut rectangular cores
Magnetic cores GAMMAMET®
Magnetic properties cut rectangual magnetic cores from amorphous and nanocrystalline alloys
GAMMAMET® 24DC
Magnetic cores GAMMAMET® 24DC are made from 25 microns thick ribbon of soft magnetic nanocrystalline alloy GM 414 on a Fe-basis. The ribbon is produced by technology of molten metal rapidly quenching. Magnetic cores GM 24DC are cut cores with C and E forms and are delivered in the form of two halves. Over a core the covering from polymer material is put.
The various sizes of cores are available with outer size up to 400 mm. The magnetic cores GAMMAMET® 24DC are used in frequency range up to 200 kHz.
Class of thermal stability is A (105°C) or F (155°C).
The service life of cores is 30 years.
Magnetic cores GAMMAMET® 24DC substitute for magnetodielectics on basis of sendust and permalloy and for ferrite cores with air cut gap.
The specification TU 1261-032-12287107-2008 guarantees inductance per one turn of winding AL for densely compressed halves of magnetic core (minimun of air gap) no less than AL=1.57·10-4S0.61 (henry), where S - cross-sectional area of core (m2).
Use area: power transformers, current transformers, reactors.
GAMMAMET® owns following patents of Russia which are used at manufacture of magnetic cores GM 24DC: 2009258, 2033649, 2117714, 2044796.
The detailed information about magnetic properties of GM 24DC 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.
Sizes of C-core (R=2 mm)
Structrure of C-core conditional mark
Sizes of oval C-core (c=2R)
Sizes of E-core
Structrure of C-core conditional mark
Size of oval E-core (c=2R)
| Magnetic core | Sizes of core, mm | Average magnetic path length lср×102, m | Cross-sectional area of core S×104, m2 | Volume V×106, m3 | |||
|---|---|---|---|---|---|---|---|
| a | b | c | h | ||||
| C16×30×40 (25) | 16 | 30 | 25 | 40 | 19,4 | 4,8 | 93,1 |
| C16×30×50 (25) | 50 | 21,4 | 102,7 | ||||
| C16×30×65 (25) | 65 | 24,4 | 117,1 | ||||
| C16×30×80 (25) | 80 | 27,4 | 131,5 | ||||
| C20×40×50 (32) | 20 | 40 | 32 | 50 | 24,4 | 8 | 195,2 |
| C20×40×60 (32) | 60 | 26,6 | 211 | ||||
| C20×40×80 (32) | 80 | 30,4 | 243 | ||||
| C20×40×100 (32) | 100 | 34,4 | 275 | ||||
| C25×50×65 (40) | 25 | 50 | 40 | 65 | 31 | 12,5 | 388 |
| C25×50×80 (40) | 80 | 34 | 425 | ||||
| C25×50×100 (40) | 100 | 38 | 475 | ||||
| C25×50×120 (40) | 120 | 42 | 535 | ||||
| C32×65×80 (50) | 32 | 65 | 50 | 80 | 38,8 | 20,8 | 807 |
| C32×65×100 (50) | 100 | 42,8 | 890 | ||||
| C32×65×130 (50) | 130 | 48,8 | 1015 | ||||
| C32×65×160 (50) | 160 | 54,8 | 1140 | ||||
| C40×80×100 (64) | 40 | 80 | 64 | 100 | 48,8 | 32 | 1562 |
| C40×80×120 (64) | 120 | 52,8 | 1690 | ||||
| C40×80×160 (64) | 160 | 60,8 | 1946 | ||||
| C40×80×200 (64) | 200 | 68,8 | 2202 | ||||
| Magnetic core | Sizes of core, mm | Average magnetic path length lср×102, m | Cross-sectional area of core S×104, m2 | Volume V×106, m3 | |||
|---|---|---|---|---|---|---|---|
| a | b | c | h | ||||
| E20×20 (50×20) | 10 | 20 | 20 | 50 | 18 | 4 | 72 |
| E20×25 (50×20) | 25 | 5 | 90 | ||||
| E20×30 (50×20) | 30 | 6 | 108 | ||||
| E20×40 (50×20) | 40 | 8 | 144 | ||||
| E25×25 (62,5×25) | 12,5 | 25 | 25 | 62,5 | 22,5 | 6,25 | 140,6 |
| E25×30 (62,5×25) | 30 | 7,5 | 168,8 | ||||
| E25×40 (62,5×25) | 40 | 10 | 225 | ||||
| E25×50 (62,5×25) | 50 | 12,5 | 281 | ||||
| E32×30 (80×32) | 16 | 30 | 32 | 80 | 28,8 | 9,6 | 276 |
| E32×40 (80×32) | 40 | 12,8 | 369 | ||||
| E32×50 (80×32) | 50 | 16 | 461 | ||||
| E32×65 (80×32) | 65 | 20,8 | 599 | ||||
| E40×40 (100×40) | 20 | 40 | 40 | 100 | 36 | 16 | 576 |
| E40×50 (100×40) | 50 | 20 | 720 | ||||
| E40×65 (100×40) | 65 | 26 | 936 | ||||
| E40×80 (100×40) | 80 | 32 | 1152 | ||||
Other sizes of C- and E- cores on request of the customer are made also.
| Magnetic induction of saturation В800 | 0,8 T |
|---|---|
| Squareness ratio Вr/Вs | <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°С | 0,02%×K-1 |
| Initial relative magnetic permeability | Bm<0,1 T | Bm>0,1 T |
|---|---|---|
| 30 | 7 f1,48Bm2,05 | 4,4 f1,48Bm1,85 |
| 60 | 4,8 f1,48Bm2,05 | 3 f1,48Bm1,85 |
| 90 | 3,6 f1,48Bm2,05 | 3 f1,48Bm1,85 |
| 140 | 2,9 f1,48Bm2,05 | 1,8 f1,48Bm1,85 |
| 250 | 2,4 f1,48Bm2,05 | 1,5 f1,48Bm1,85 |
| 350 | 2,1 f1,48Bm2,05 | 1,3 f1,48Bm1,85 |
| 500 | 1,8 f1,48Bm2,05 | 1,15 f1,48Bm1,85 |
| 700 | 1,6 f1,48Bm2,05 | 1,0 f1,48Bm1,85 |
| 1000 | 1,5 f1,48Bm2,05 | 0,9 f1,48Bm1,85 |
| f – frequency (Hz), Вm – maximum magnetic induction (T) | ||
Factor of induction AL = 2,5×10-4S0,61 for minimum of air gap lв
