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MS-Schramberg
GmbH & Co. KG
Max-Planck-Straße 15
D-78713 Schramberg-Sulgen

Tel.: +49 7422 519-0
Fax: +49 7422 519-1100

Magnetic ratings

Printer friendly view Energy product Remanence rev. Temp.- coeff. Coercivity rev. Temp.- coeff. Max. operating temp. Density
(B*H)max. Br of Br HcB HcB HcJ HcJ of HcJ    
 
Hard ferrite magnets 1)   kJ/m3
(typ.)		 kJ/m3
(min.)		 mT
(typ.)		 mT
(min.)		 ca. %/K kA/m
(typ.)		 kA/m
(min.)		 kA/m
(typ.)		 kA/m
(min.)		 approx. %/K approx. °C approx. g/cm3
HF 8/22 Ba
isotropic		 dry pressed   8,5 8,0 220 215 -0,19 140 135 230 220 0,30 250 4,80
HF 24/16 Ba
anisotropic		 dry pressed   25,5 24,0 365 350 -0,19 175 155 180 160 0,30 250 5,00
HF 8/26 Sr Sr
isotropic		 dry pressed   8,5 8,0 220 215 -0,19 140 135 270 260 0,30 250 4,70
HF 24/23 Sr
anisotropic		 dry pressed   25,5 24,0 365 350 -0,19 220 210 240 230 0,30 250 4,80
HF 26/24 Sr
anisotropic		 dry pressed   27,0 26,0 380 370 -0,19 230 220 250 240 0,30 250 4,80
HF 28/26 Sr
anisotropic		 wet pressed   30,0 28,0 395 385 -0,19 255 240 275 260 0,30 250 4,85
HF 28/28 Sr
anisotropic		 wet pressed   30,0 28,0 395 385 -0,19 270 260 290 280 0,30 250 4,85
HF 30/26 Sr
anisotropic		 wet pressed   31,5 30,0 405 395 -0,19 250 240 270 260 0,30 250 4,85

1) All values were determined with standard samples according to IEC 60404-5. With unusual geometries, especially with thin walls or narrow pole pitches, deviations from the material data can occur.

Term definition

Element "Ba":

Abbreviation for the element barium with the atomic number 56 from the sixth period of the second main group in the periodic table, thus belonging to the alkaline earth metals. In the earth's geosphere, it has a proportion by weight of approx. 0.026%[1] and must therefore be characterized as a hazardous substance. It is easily flammable and an irritant.

 

Element "Sr":

Abbreviation for the element strontium with the atomic number 38 from the fifth period of the second main group of the periodic table, thus belonging to the alkaline earth metals. In the earth's geosphere, strontium has a proportion by weight of approx. 0.014%[1]. In contrast to barium, strontium is not a hazardous substance.

 

Isotropic:

Description that a property is independent of the direction. For a magnet, this means that all molecular magnets (the smallest magnetic particles) have different distributions. This apparent chaos balances the positions of all the molecular magnets, thus also balancing their effect toward the exterior. If a magnet prepared under isotropic conditions is magnetized, only the molecular magnets already oriented in the direction of magnetization will be magnetized. This is why magnets of the same material prepared under isotropic conditions are weaker than magnets prepared under anisotropic conditions.

 

Anisotropic:

The opposite of isotropic describes that a property depends on the direction. For a magnet, this means that all molecular magnets have the same orientation. This can be achieved by preferential orientation of the base material. The magnetic values of the magnets prepared under anisotropic conditions are clearly higher than those of the magnets prepared under isotropic conditions.

 

Dry-pressed:

This describes the process by which the magnets are produced. Dry-pressed magnets are made from a powder by pressing. This technology is mostly used for small magnets.

 

Wet-pressed:

This describes the process by which the magnets are produced. Wet-pressed magnets are made from wet material, a so-called slurry, by pressing. The magnetic values of wet-pressed magnets are better than those of dry-pressed magnets. However, the forming options of wet-pressed magnets are fewer, and the press cycles clearly longer.

 

 

Source:

[1]: Harry H. Binder: Lexikon der chemischen Elemente, S. Hirzel Verlag, Stuttgart 1999.

Energy product (B*H)max:

The final values Br (remanence), Hc (coercive field strength) and (B*H)max. (energy product) are the most important magnetic properties of a permanent magnet. The greatest possible energy product (B*H)max. describes the highest energy density that can be achieved with a material. In general, the following applies: The higher the energy density, the smaller the magnetic volume (V) required for a certain task under otherwise identical conditions.

 

Remanence Br:

Remanence is understood as meaning the remaining magnetism in a particle, after removing the magnetizing field. The term remanence is the associated remaining flux density. The remaining magnetism is formed by a previously used magnetic field, such as that of an electrified coil giving the particle its own magnetic field by virtue of induction.

 

Rev. temp. coeff:

Stands for the reversible temperature coefficient and represents the relative change in a physical property as a function of a change in temperature by one Kelvin.

 

Coercivity:

Stands for the magnetic field strength required to completely demagnetize ferromagnets. A high coercive field strength means that a magnet exhibits high stability against demagnetization. Please note that the coercive field strength is highly temperature-dependent.

 

Max. operating temp.:

Denotes the maximum temperature at which the magnet can still be used. It is far below the Curie temperature. Please note that the maximum operating temperature is a function of the magnet geometry and the opposite fields occurring in use. This means that the values stated in the data sheets are only guide values.

 

Density:

The density of a body is the relationship between the mass and the volume and describes whether a body is relatively light or heavy.