Answer Posted / khushalchand
Only a Double excited Electrical machine can act as a
Generator. Please note eg. you cannot generate power from a
squirel cage induction motor as it does not have a dual
power source, it can only operate as a motor as the rotor
is short ckted. In all other cases where the stator
(winding) and rotors(armature) are powered seperately, only
then energy can be converted from mechanical to electrical
(generator) or electrical to mechanical (Motor)
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