Operation of synchronous generator
In a synchronous generator, a DC current is applied to the rotor winding producing a rotor magnetic field. The rotor is then turned by external means producing a rotating magnetic field, which induces a 3-phase voltage within the stator winding. The rotor of a synchronous machine is a large electromagnet.
BEEE notes on DC machines , induction motors and Synchronous generators
This pdf contains a self explanatory notes on the topics Induction motor , DC machines and synchronous generators. It has been prepared by a well experienced faculty for better understanding of students. It gives good reference during the exams.