Neodymium-Iron-Boron Segment Countersunk Motor Magnets REFeB or NdFeB magnets have only been developed recently and consist of the rare earth neodymium, iron and boron. Energy products, which are up to 40% above currently known and used metallic magnets, can be produced using this combination of materials. Permanent magnets made from Neodymium-Iron-Boron alloys enable the realisation of new technological solutions and the reduction of the utilisation of magnetic materials with the same performance level of the system and also provides the possibility of miniaturising the whole system. In contrast to SmCo magnets, the raw materials for NdFeB magnets are more readily available as the content of neodymium in rare earth ores is substantially higher than that of samarium.
Neodymium magnets can be divided into three main groups: 1.Regular Neodymium Magnets 2.High corrosion resistant Neodymium Magnets 3.Bonded Neodymium (Isotropic): Manufactured by the injection of plastic material and Neodymium into a mold. This production method yields a very precise magnet which does not require further grinding and does not suffer substantial current loss. Advantages and Disadvantages of NdFeB Permanent Magnets / Neodymium Segment Countersunk Magnets for Motor 1) Is the strongest magnetic of permanent magnets, has the high energy (BH value) and good coercive force. 2) Manufacturing by the the vacuum sintering process, process maturity;small dimensions,have the good performances and prices; energy (BH value) of NdFeB magnets is more than ten times higher than Ferrites, it is the strongest magnetic materials in the world today, have “magnetic king”reputation.
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