Table 1

Comparison of magnet material properties [6].

Ferrite NdFeB SmCo AlNiCo
(BH)max (kJ/m3) 10...35 200...400 150...230 35...60
Tmax (°C) 225 150...230 250 450
αBr (%/K) −0.2 −0.15...−0.08 −0.06...−0.02 −0.03
αHc (%/K) 0.2...0.5 −0.6...−0.4 −0.4...−0.2 0.2

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