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Q. Working of self - excited generators?
For self-excited generators, residual magnetism must be present in the ferromagnetic circuit of the machine in order to start the self-excitation process. For a dc generator, the relationship between steady-state generated emf Ea and the terminal voltage Vt is given by
where Ia is the armature current output, and Ra is the armature circuit resistance. For a dc motor, the relationship is given by
Vt = Ea + Ia Ra
where Ia is now the armature current input. Under steady-state conditions, volt-ampere characteristic curves are of interest for dc generators, and speed-torque characteristics are of interest for dc motors. Depending on the method of excitation of the field windings, a wide variety of operating characteristics can be obtained. These possibilities make the dc machine both versatile and adaptable for control.
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