Using the magnetization characteristics for samarium cobalt 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 samarium-cobalt magnet, by what factor does this reduce the magnet volume required to achieve the desired air-gap flux density?

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