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Answer Posted / raja
I support answer 1. But in detail. The flux in the stator of
DC machine (Yoke, poles) is not a time varying one. So it
can't produce any induced emf in those structures. In turn
there is no possibility to have eddy current. And since
there is no reversal of pole there is no possibility of
hysteresis loss also. In turn there is no need to laminate
the core.
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