Why are the pole faces of dc machine kept curved i.e. circular???
et,we
have used plane face pole. Distance between pole & rotor will
minimum in the middle of pole, and maximum in the edge of the pole.
So,magnetic fld intensity will vary to the conductor of armature. But,we
need to provide a constant fld. To do this,we should make the gape
betwn pole & rotor constant. As,rotor is circular,so pole should be
circular.
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