Rare-earth permanent magnets produced by Research
and production Company MMT, Ltd. feature:
- highest magnetic field values among the industrial magnets;
- super-high coercitivity (demagnetization resistance),
unmatched by any other type of permanent magnets;
- enhanced mechanical strength;
- exactly measured thermal and temporal stability of magnetic
flux;
- thermal stability up to high temperatures.
Application of magnetic elements and systems based on such magnets
allows to:
- decrease the weight of magnetic systems and elements;
- decrease the dimensions of magnetic elements and systems;
- develop new approaches to design of magnetic systems
for various applications;
- realize entirely new magnetic systems with parameters
unmatched even by electromagnets and solenoids.
Properties of Nd-Fe-B magnets produced by our Company, according
to the technical specifications
ÒÓ
1984-001-18785310-2003 and
ÒÓ 3498-002-18785310-2003,
are given in Table 1. Magnets of type Sm-Co are produced in
accordance with ÃÎÑÒ 21559 (Russian state technical standard).
| Type |
Br,
kGsOersted |
Hcb,
kOersted |
(BH)max,
MGsOersted |
Hcj,
kOersted |
RTCI, %°C-1 |
| min |
max |
min |
max |
min |
max |
| MAEP43ML |
13.0 |
13.4 |
9.8 |
- |
42.0 |
44.0 |
10.0 |
- 0.12 |
| MAEP34ML |
11.6 |
12.0 |
11.0 |
11.6 |
32.0 |
32.6 |
12.0 |
- 0.12 |
| MAEP40ML |
12.6 |
13.0 |
12.4 |
12.8 |
39.0 |
42.0 |
13.0 |
- 0.12 |
| MAEP36AL |
11.8 |
12.4 |
11.6 |
12.2 |
34.0 |
38.0 |
17.0 |
- 0.12 |
| MAEP32HL |
11.2 |
11.6 |
11.0 |
11.4 |
31.0 |
33.0 |
22.0 |
- 0.12 |
| MAEP30HsL |
10.8 |
11.2 |
10.6 |
11.0 |
29.0 |
31.0 |
27.0 |
- 0.12 |
| MAEP38Als |
12.2 |
12.6 |
12.0 |
12.4 |
37.0 |
39.0 |
17.0 |
- 0.12 |
| MAEP35HLs |
11.7 |
12.1 |
11.5 |
11.9 |
34.0 |
36.0 |
22.0 |
-0.12 |
| MAEP33HsLs |
11.4 |
11.8 |
11.2 |
11.6 |
32.0 |
24.0 |
27.0 |
- 0.12 |
| MAEP30HSs |
10.8 |
11.2 |
10.6 |
11.0 |
29.0 |
31.0 |
18.0 |
-0.06 |
| |
| Type |
Br, Tesla |
Hcb, kA/m |
(BH)max,
kJ/m3 |
Hcj,
kA/m |
RTCI, %°C-1 |
| min |
max |
min |
max |
min |
max |
| MAEP43ML |
1.30 |
1.34 |
785 |
- |
335 |
355 |
800 |
- 0.12 |
| MAEP34ML |
1.16 |
1.20 |
880 |
930 |
255 |
290 |
960 |
- 0.12 |
| MAEP40ML |
1.26 |
1.30 |
990 |
1020 |
310 |
335 |
1050 |
- 0.12 |
| MAEP36AL |
1.18 |
1.24 |
930 |
980 |
270 |
305 |
1350 |
- 0.12 |
| MAEP32HL |
1.12 |
1.16 |
880 |
910 |
250 |
265 |
1750 |
- 0.12 |
| MAEP30HsL |
1.08 |
1.12 |
850 |
880 |
230 |
250 |
2150 |
- 0.12 |
| MAEP38Als |
1.22 |
1.26 |
960 |
990 |
295 |
310 |
1350 |
- 0.12 |
| MAEP35HLs |
1.17 |
1.21 |
920 |
950 |
270 |
290 |
1750 |
-0.12 |
| MAEP33HsLs |
1.14 |
1.18 |
900 |
930 |
255 |
270 |
2150 |
- 0.12 |
| MAEP30HSs |
1.08 |
1.12 |
850 |
880 |
230 |
250 |
1450 |
-0.06 |
Note:
Br, kGauss(Tesla) - residual magnetic
induction,
Hcb, kOersted(kA/m) - induction coercive
force,
(BH)max, MGaussOersted(kJ/m3) - maximum
energy product,
Hcj, kOersted(kA/m) - magnetization
coercive force,
RTCI, %/°Ñ - Reversible temperature coefficient
of induction in the temperature range of 20 - 100°Ñ.
|
More detailed information concerning the magnets of type MAEP
and specific measurement techniques is given in the Technical
specifications:
ÒÓ 1984-001-18785310-2003 «Hard
magnetic materials based on iron alloys containing neodymium
and boron».
MMT Ltd. produces a wide range of rare-earth permanent magnet
types (size, form, magnetization direction, etc.) This variety
of magnet types is described by the technical specifications ÒÓ
3498-002-18785310-2003 «Sintered
permanent magnets based on iron alloys containing neodymium
and boron». A few
examples of magnet types produced by R&D company MMT is
given in Section
«MMT magnet types».
Hysteresis characteristics of Sm-Co alloys produced by MMT comply
with the requirements of Russian state standadrd ÃÎÑÒ 21559-88
«Sintered hard magnetic materials». A more detailed description
of rare-earth sintered hard magnetic materials is given in the
paper:
Lukin A.A., Dormidontov
A.G. in the Russian journal "Radiotechnika" (Radio technology),
2001, ¹2, pp. 87-93.
Note that the mentioned variety of magnets is produced both
for direct shipment to the customers and for their application
in magnetic systems produced by the Second production department
of MMT Ltd. This department produces ready magnetic systems
with parameters required by the Customer.
Parameters of the basic types of industrial permanent magnets
are shown for comparison in
Figure
1 (Hysteresis characteristics of the most common types of industrial
permanent magnets) and the following Tables:
2. Magnetic
parameters of the most common types of rare earth magnets
3.
Electric
and calorimetric parameters
4.
Mechanical
parameters
Magnets of Nd-Fe-B type exhibit a unique combination of magnetic
hysteresis parameters (B
r, H
cb, H
cj
è (BH)
max) unmatched by any other type of permanent
magnets.
This allows an essential decrease of size, weight, and, as a
rule, cost of magnetic systems (elements) when such magnets
are used for upgrade of devices designed for other magnet types.
However, the main advantage of this unique combination of parameters
is feasibility of a new fundamental approach to the development
of magnetic systems for a wide range of applications. Nd-Fe-B
magnets allow to realize entirely new magnetic system designs
with parameters unmatched even by electromagnets.
