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Glossary - N |
Neodymium-Iron-Boron (NdFeB)
Neutral axis
Normal magnetization curve
Nuclear magnetic resonance (NMR)
Neodymium-Iron-Boron (NdFeB)
Type of permanent magnet material, discovered in 1983 independently by Sumitomo and General Motors. The complete formula is Nd2Fe14B, even if other addictive elements are often present, like Dy, to enhance coercivity. It is characterised by high values of Br, HcB, BHmax. Its properties are due to high crystalline anisotropy.
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Neutral axis
In the electric motor terminology, concerning the cross section of a circular machine, is the axis that divides two poles. (See magnetic axis)
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Normal magnetization curve
It is the geometrical place of vertices of symmetrical cycles performed at different excitation field Hv.
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Nuclear magnetic resonance (NMR)
A magnetic field is capable to split an energetic level of some nuclei in two different levels, separated by an energy amount ΔE proportional to the intensity of the magnetic field. An electromagnetic field with an energy of ΔE can undergo a transition between the two levels. This condition is called nuclear magnetic resonance (NMR). Measuring the energy (by measuring the frequency) of the electromagnetic wave that gives the resonance, it is possible to measure the magnetic field that split the two levels with a very high accuracy (some p.p.m.).
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