RARE EARTH MAGNETS
Rare earth magnets get their name from the fact that their compositions include rare materials of various natures. They are subdivided into a few main categories.
The two most important are:
• neodymium-iron-boron magnets (NdFeb)
• samarium-cobalt magnets (Sm-Co)
NEODYMIUM AND PLASTO-NEODYMIUM BONDED MAGNETS INNUOVO
Neodymium magnets are magnets which are characterized by extremely high fluxes and are capable of providing the highest energy product amongst all the common state of the art magnets. These magnets also have a high mechanical resistance, which renders them preferable to Samarium-Cobalt magnets for a series of magnetic applications.
Certain critical aspects of these magnets, such as their predisposition for corrosion, have now been largely superseded by new technologies. The new alloys of NdFeB magnets, in the most recent grades, are almost just as resistant to irreversible losses depending on very high temperatures as Samarium-Cobalt magnets.
The bonded plasto-neodymium magnets combine the typical advantages of sintered with the extreme pliability of the shapes.
Despite their intrinsic constructive fragility, Samarium-Cobalt magnets are irreplaceable wherever consistent performance at high temperatures is required and wherever high air humidity and salinity values are present. In fact, Sm-Co magnets guarantee consistent performance that cannot be obtained with any grade of NdFeB magnets at such temperatures values.
A typical application for rare earth magnets is the production of brushless DC motors. Other common applications include sensors, toys, lifting mechanisms, separators and magnetic griddles.
Due to its experience acquired through years of collaboration with major producers of high-performance motors, ITACA S.p.A. is now amongst the most important European distributors in this sector.