Using the magnetization characteristics for neodymium-iron-boron given in figure find the point of maximum-energy product and the corresponding flux density and magnetic field intensity, using these values, repeat Example 1.10 with the Alnico 5 magnet replaced by a neodymium-iron-boron magnet. By what factor does this reduce the magnet volume required to achieve the desired air-gap flux density?

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1.5 1.4 neodymium-iron-boron Alnico 5 1.3 samarium-cobalt Alnico 8 Ceramic 7 1.2 1.1 1.0 0.9 0.8 B. T 0.7 0.6 0.5 0.4 0.3 0.2 0.1 -1000 -900 -700 600 -300 -200 -100 -800 -500 -400 H, kA/m