Assume that the commercial iron (99.95 wt% Fe) in Table 18.5 just reaches the point of saturation when inserted within the coil in Problem 18.1. Compute the saturation magnetization.
Table 18.5 Typical Properties for Several Soft Magnetic Materials
Material | Composition (wt%) | Initial Relative Permeability µi | Saturation Flux Density Bs [tesla (gauss)] | Hysteresis Loss/Cycle J/m3 (erg/cm3)] | Resistivity ρ (Ω m) |
Commercial iron ingot | 99.95 Fe | 150 | 2.14 (21,400) | 270 (2,700) | 1.0 × 10–7 |
Silicon–iron (oriented) | 97 Fe, 3 Si | 1,400 | 2.01 (20,100) | 40 (400) | 4.7 × 10–7 |
45 Permalloy | 55 Fe, 45 Ni | 2,500 | 1.60 (16,000) | 120 (1,200) | 4.5 × 10–7 |
Supermalloy | 79 Ni, 15 Fe, 5 Mo, 0.5 Mn | 75,000 | 0.80 (8,000) | — | 6.0 × 10–7 |
Ferroxcube A | 48 MnFe2O4, 52 ZnFe2O4 | 1,400 | 0.33 (3,300) | ~40 (~400) | 2,000 |
Ferroxcube B | 36 NiFe2O4, 64 ZnFe2O4 | 650 | 0.36 (3,600) | ~35 (~350) | 107 |
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