What is the purpose of excitation?
What is the purpose of excitation?
The basic function of an excitation system is to provide a continuous (DC) current to the field winding of a synchronous machine. This is achieved through the use of closed-loop control (or feedback control).
What is excitation voltage?
An excitation voltage or current is the amount of electric energy ( D.C ) feed into the field winding of an alternator rotor to produce magnetic flux / field. The alternator which supply its own excitation voltage are are called self excited alternators.
What are the types of excitation system?
The four common excitation methods include:
- Shunt or Self Excited.
- Excitation Boost System (EBS)
- Permanent Magnet Generator (PMG)
- Auxiliary Winding (AUX).
How does excitation work?
The excitation system creates the electromagnetic field in the rotor. The stator has the armature winding that has the electrical energy induced. The stronger the magnetic field created, the stronger the electrical power produced. The strength of the magnetic field is adjusted by controlling the current to the rotor.
What is PMG excitation?
The PMG (Permanent Magnet Generator) is a system which is used for secondary exciting. The PMG provides stable and reliable electric energy for AVR regardless the generator’s terminal voltage. The generator with PMG excitation system can provide 300% rated current during short-circuit, which occurs for 5–10 seconds.
What is the purpose of exciter diodes?
By blocking half of AC’s sine wave, diodes effectively morph the current into DC power. This process is necessary for a generator’s alternator to work because the magnetic field relies on DC power. The AC output of the exciter must be transformed to DC power before it can be used to generate electrical energy.
Why AVR is used in generator?
An automatic voltage regulator (AVR) is a device used in generators with the purpose of automatically regulating voltage, which means that it will turn fluctuating voltage levels into constant voltage levels.
Why PMG is used in alternator?
Permanent Magnet Generators (PMG), also called Permanent Magnet Alternators (PMA), use the magnetic field of the rotor to provide a stable, reliable power source. Georator’s NoBrush® 400 Hz alternators provide excellent voltage stability, eliminating the need for further regulation in most applications.