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why in motors dc extitaedtion is prefer

why in motors dc extitaedtion is prefer..

Answer / ashutosh jha

An electric generator or electric motor consists of a rotor spinning in a magnetic field. The magnetic field may be produced by permanent magnets or by field coils. In the case of a machine with field coils, a current must flow in the coils to generate the field, otherwise no power is transferred to or from the rotor.

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