Explanatory answer :
by steinmetz formula,
Hysteresis loss, Wh=n(Bmax)1.6f v watts
Where
n= hysteresis co-efficient
f= frequency of reversal of magnetism
v= volumeof magnetic material
from the above above relation, we conclude that hysteresis loss (Wh) is proportional to hysteresis co-efficient (n) hence by selecting a magnetic material with low hysteresis co-efficient value and high electrical resistivity , the hysteresis loss can be reduced.
Hysteresis co-efficient value for different magnetic materials :
n= 502 J/m3 for good dynamic sheet steel
n= 191 J/m3 for silicon steel
n= 7040 J/ m3 for hard steel
n= 750-3000 J/ m3 for for
cast steel
n= 2700-4000 J/ m3 for cast iron
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