ABOUT MAGNETS   >   Magnet types   >   Neodymium magnets (FeNdB)

Neodymium magnets (FeNdB)

FeNdB

Introduction

Permanent magnets on based on FeNdB (sometimes also NdFeB) contain elements of the rare earths neodymium (Nd), dysprosium (Dy), and possibly praseodymium (Pr). They achieve the highest values of the inner magnetic energy.

They are manufactured by sintering very finely ground substances, as their direct casting is impossible - see Manufacturing technology.

These magnets allow for considerable miniaturisation of dimensions, as they exert the same portative force with much smaller dimensions than, for example, ferrite magnets.

Properties

FeNdB magnets are hard and fairly brittle which needs to be borne in mind especially when manipulating magnetised products in the vicinity of other magnets or ferromagnetic materials (iron,...). Magnets are manufactured in standard shapes which can be slightly modified by grinding. However, care needs to be taken so that the ground surfaces do not get hot (see the table of magnetic properties - max. application temperature).

Neodymium magnets are generally prone to corrosion and their surfaces receive a special finish or their corrosion-resistivity is enhanced by a special technology (so-called HAST magnets).

The magnetic characteristics of the individual magnet classes are shown in the table below.

Applications

The neodymium magnet has a wide range of uses in applications where strong magnetic interaction (portative force) needs to be developed or where small dimensions are important. They include, for example, rotors and stators of electric motors, linear motors, magnetic clutches and brakes, magnetic polarisers of liquids, magnetic separators and protection systems against shoplifters. Magnets from rare earths are also used in the following sectors: automated devices and robots, cars, toys, kitchen machines, washing machines, dishwashers, wrist watches, computer technology, etc.

Magnetic properties – neodymium magnets

Class Coercivity Remanence Max. product Max. application temp.
HcB Hcj Br [mT] (BH)max [kJ/m3] oC
[kA/m]
N35 ≥868 ≥955 1170-1210 263-287 90
N38 ≥868 ≥955 1210-1250 287-310 90
N40 ≥835 ≥955 1260-1290 318-324 90
N42 ≥835 ≥955 1290-1320 324-342 80
N45 ≥835 ≥955 1330-1370 342-366 80
N50 ≥842 ≥876 1400-1440 324-342 70
N52 ≥842 ≥876 1440-1470 394-414 70
N30H ≥810 ≥1353 1080-1120 232-239 120
N33H ≥842 ≥1353 1140-1170 247-263 120
N35H ≥868 ≥1353 1170-1210 263-279 120
N38H ≥915 ≥1353 1220-1260 287-303 120
N40H ≥915 ≥1353 1260-1290 303-318 120
N42H ≥899 ≥1353 1290-1320 318-334 120
N44H ≥923 ≥1274 1330-1360 334-350 110
N30SH ≥804 ≥1592 1080-1120 223-239 150
N33SH ≥844 ≥1592 1140-1170 247-263 150
N35SH ≥860 ≥1592 1170-1210 263-279 150
N38SH ≥860 ≥1592 1210-1250 287-302 150
N40SH ≥860 ≥1592 1260-1290 303-318 150
N42SH ≥907 ≥1512 1300-1330 318-334 140
N30UH ≥804 ≥1990 1080-1120 223-239 180
N35UH ≥836 ≥1990 1170-1210 263-278 180
N38UH ≥907 ≥1990 1220-1260 287-303 180
N30EH ≥804 ≥2388 1080-1120 223-239 200
N33EH ≥820 ≥2388 1140-1170 247-263 200
N35EH ≥860 ≥2388 1170-1210 263-279 200

WHERE TO FIND US?

ABC MAGNET s.r.o.
Areal Big box, hall B10
Ve Žlíbku 1800
193 00  PRAHA 9 - Horní Počernice