What is the maximum temperature of the neodymium magnets?

In: Applications of magnets On: Hit: 313

Neodymium magnets should be designed for maximum operating temperatures above +80°C, through an appropriate selection of neodymium quality. This neodymium quality is characterized by a subsequent upper case letter after the combination of N.

Versatile magnets such as neodymium discs and their working temperatures

When using permanent magnets, the ambient temperature at which the magnets are exposed is very important. Permanent magnets can only be used up to their maximum operating temperature. If this maximum temperature is exceeded, the magnets lose their magnetic properties. Depending on the additional information, neodymium disks can, be used at maximum operating temperatures of +80°C to +230°C. For example, an N35 can be used up to +80°C. Nevertheless, a neodymium magnet type "VH / AH" is used up to a maximum temperature of +230°C. As a general guide for the loss of magnetic properties it can be assumed that the Celsius increase by degree of the neodymium magnet temperature 0.11% of its magnetism loses.

Neodymium magnets also work well in cold climates down to -130°C. The power reduction here is about 15%. However, a very fast increase in temperature can cause a thermal shock of the neodymium magnet. Then it could crack or even break. In addition, neodymium magnets must be protected against demagnetization of fields or radiations. Both could adversely affect the magnetic properties of the neodymium magnet.

Neodymium discs

Quality neodymium disc magnets

To make a specific selection of a very specific application, neodymium magnets are classified according to their properties. The description of a neodymium magnet starts with N. The next number is a measure of the strength of the generated magnetic field, more specifically, this figure is the maximum energy product of the permanent magnet in "Mega-Gauss-Oersteds" (MGOe) . With increasing numbers after N there is also an increase in the intensity of the connected magnetic field. In addition, the values ​​of remanence and coercive force increase. The quality standards are N30 to N52, since grades outside these ranges are not produced.

Neodymium magnets should be designed for maximum operating temperatures above +80°C, through an appropriate selection of neodymium quality. This neodymium quality is characterized by a subsequent upper case letter after the combination of N.

Optically, this means that the neodymium grades are designed in the following order for the maximum temperatures:

         Type N up to +80°C
         NM up to +100°C
         NH up to +120°C
         NSH up to +150°C
         NUH up to +180°C
         NEH up to +200°C
         NAH at +230ºC

It should be mentioned at this point that the values ​​indicated for the maximum temperatures are only indicative. Other influential factors, such as the size and structural design of the permanent magnet, decisively influence the maximum temperature at which the magnet loses its magnetic properties.

 

Manufacturer of high quality powerful magnets

The production of magnets from neodymium or other magnetic materials requires of a great experience and a great sensitivity for each application. The geometrical design of a magnet significantly influences the position and shape of magnetic field lines. A good provider of permanent magnets is the Imagnetshop company.

 

Conclusion

Neodymium magnets tend to corrosion due to their iron content. Therefore, a neodymium magnet should definitely be covered. A good coating option for the neodymium magnets are the rubber covers. These rubber covers prevents corrosion of chemical reactions of atmospheric oxygen with iron components.

At working temperatures above +230°C, Alnico magnets would be the best option. Although these magnets are weaker than neodymium magnets, they can be used up to +525°C working temperatures. In addition, Alnico magnets have a good resistance to corrosion even without coating.

Magnets made of neodymium are also used in loudspeakers, where they are used to convert the vibrations of the air generated by sounds into electrical impulses.

Do not hesitate to contact us to solve any problem you have with permanent magnets or any other magnetic product. We will be happy to help you.

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