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For a 3 phase alternator why there is an AC voltage generated in the absence DC excitation?
due to residual magnetism
What is excitation and why is it needed for start up in an AC generator?
An alternator is just another name for a synchronous generator. Excitation is needed to create a magnetic field in the rotor. When to rotor is spun with excitation the magnetic field will cut through the stator field and produce an AC voltage in the stator field. In terms of an alternator with built in rectifier the stators AC voltage in the rectified to DC. The strength of excitation will determine the alternators output voltage. The AVR Automatic Voltage Regulator built into almost every alternator controls field current to maintain a constant output voltage.
In an alternator what is the initial excitation current from the battery is supplied to?
In an alternator, the initial excitation current from the battery is supplied to the rotor windings. This current establishes a magnetic field necessary for the alternator to generate electricity. Once the rotor starts spinning, the magnetic field induces an alternating current (AC) in the stator windings, allowing the alternator to produce electrical power. The initial excitation is crucial to kick-start the generation process.
Why DC suuply used in Excitation of Alternator?
for torque improvement in armature and create n-pole or s-pole in armature a dc source is used in alternator armature.
How do you calculate the excitation voltage and current of an alternator?
formals to calculate exciation voltage of alternator
What is needed to generate AC electricity?
An AC generator (Alternator). A rotor is turned into a magnet by what is known as 'excitation' current. The rotor then induces AC current in the stator windings as it is rotated within it. This is AC, due to the fact that the rotor has a north and south pole, which alternately induces current in the stator windings. The exitation current is provided to the rotor via slip rings. Controlling this excitation current will also control the output power by suitable control circuitry. This is the same principle, whether it is a small domestic generator, a power station, a wind turbine, or a car alternator.
Excitation system in alternator?
A typical alternator uses permanent magnets mouted on the rotor. Their movement excites the stator of wound coils in the housing. The resulting AC current is rectified and controlled by diodes and a voltage regulator, also typically mounted inside the housing.
Why The Excitation current is non-sinusoidal when applied voltage is sinusoidal?
excitation voltage is sinusoidal because it is taken from the terminal of alternator but excitation current is non-sinusoidal because it always dc.
Does an alternator work similar to an ac generator?
Alternator and ac generator is equal
Alternator generates DC or AC?
An alternator produces AC current but it is converted to DC by the rectifier inside the alternator.
Why is dc current used in the excitation of generator?
The field current is used for the excitation of generators.AnswerYou use DC current, because you want the resulting magnetic field to be constant. If you used AC, the resulting magnetic field would vary in both strength and direction.
What voltage is generally used for field excitation?
For a small generator like the 125 Watt Alternator/Generator in your car, 12 Volts at a couple Amps. For a large 1,200,000,000 Power Plant Generator typical excitation is 600V at 8000A.
