Question

Which of the following is used to provide the required DC field current to the generator rotor?
1. Rectifier
2. Exciter
3. Damper Winding
4. Generator

Answer 1

Correct Answer - Option 2 : Exciter

Exciter:

• The generator which gives dc supply to the rotor of alternator is called exciter.
• The rotor or the field coils in a generator produce the magnetic flux that is essential to the production of electric power.
• The rotor is a rotating electromagnet that requires a DC electric power source to excite the magnetic field. This power comes from an exciter.
• The exciter is a small DC generator coupled to the same shaft as the rotor.
• Therefore, when the rotor rotates this exciter produces the power for the electromagnet.
• Control of the exciter output is done by varying the field current of the exciter.
• This output from the exciter then controls the magnetic field of the rotor to produce a constant voltage output by the generator.

 

Solution:

An exciter is used to provide the required DC field current to the generator rotor.