Ac Generators Flashcards
What happens to the EMF when the relative motion ceases?
The EMF ceases.
What voltage do we generate on RN ships for most electrical equipment on board?
450v
What is the most common type of generator in use today?
Brushless.
What sort of current is fed into the exciter stator?
Direct.
How does the generator produce an AC output if the magnetic field around the rotor is stable?
By rotating the magnetic field inside.
What does the generated EMF output depend upon?
The strength of the magnetic field.
How can the voltage generated by an AC generator be altered?
By changing the strength of the magnetic field.
What type of voltage does the AVR deliver to the excitation coils?
DC voltage.
What is fitted to the AC generator rotor to make it turn? Provide two examples.
- Diesel engine
- Gas turbine.
How is the HF generator driven?
By a rotating engine. Belt drive
What is the HF generator output voltage?
115V AC
Where is the HF generator output fed to?
To the AC exciter via the AVR.
What is the purpose of the Automatic Voltage Regulator (AVR)?
To maintain 450 V output.
What is the purpose of the rectifier assembly?
Converts AC exciter output to DC.
What inputs does the AVR receive to provide a voltage output to the DC exciter?
- 115 V AC
- Single Phase.
What are the voltage, frequency, and phases of the stator output?
- Voltage: 450 V
- Frequency: 60 Hz
- Phases: 3 phase.
