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In an alternator, field windings are placed on the rotor to create a rotating magnetic field necessary for inducing electrical current in the stator windings. This configuration allows for a more compact design and enables the use of higher magnetic flux densities, improving the alternator's efficiency. By placing the field windings on the rotor, the alternator can generate a strong magnetic field while keeping the stator stationary, which simplifies the design and minimizes wear on the components. Additionally, this arrangement allows for easier cooling of the rotor and better control of the magnetic field strength.
What else can I help you with?
What is a exciter generator?
its creates the magnetic field trough the electricity,which we called exciter for it.we send some electric shocks to the field coils,then it will magnetized the stater of the generator. When Diesel or petrol engine rotates the rotter of the generator, EXCITED stater act as a magnet. Depend on alternator`s design,rotter or stater one always EXITED to be a magnet. When engine turns the Alternator against the magnetic field,electricity is produced.
Why field windings of synchronous alternator are excited by dc?
The 'field'winding is in the rotor which rotates at the synchronous speed generating AC powerat the right frequency in the stator. That requires DC in the rotor. It is convenient because the DC is supplied to the rotor through slip rings, smooth polished rings which allow the carbon brushes to last a long time.
Is the dc shunt motor does not have any brushes?
No. A d.c. 'shunt' motor is one whose stator's field windings are connected in parallel with its rotor windings ('shunt' is simply an archic term for 'parallel'); it does not mean that the rotor can function without brushes.
How energy is transferred from stator to rotor?
when current is passing through the stator windings of motor magnetic field is develop ,due to it emf is produced inside the stator windings,that emf is further cuts the emf across stator due to which current flowing inside the rotor.
How do you counter the induced voltage spark during the generator?
By creating a rotating electric field. The generator has two main sets of windings - the field windings (the spinning ones on the rotor usually) and the stator windings(the stationary part connected to the grid). The field windings are electrified to create an electromagnet out of the rotor. Spinning the rotor creates a rotating electric field, which induces a voltage on the stator windings.
What is rotor in ac alternator?
A Rotor is a mechanism in the alternator that is driven by the pulley belt from the engine.which creates a magnetic field which causes voltage.Answer.The rotor does not 'create' a magnetic field. The emf induced in the stator winding is due to the residual magnetic flux of the rotor which cuts the stator windings as the rotor rotates.
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.
How a brush type 3 phase alternator works?
A pair of slip rings on the rotor carries current from the stationary brushes to the rotor windings in order to establish a magnetic field. As the alternator rotates, the magnetic field sweeps across the stator windings inducing an electric current in these windings. This current is an alternating current which is rectified via diodes and passed out of the alternator by means of the battery lead and (usually) the grounded alternator case. The battery voltage is sensed and used to vary the amount of current fed to the rotor in order to adjust the amount of current generated.
What does the rotor on an alternator do?
The rotor on an alternator is a rotating component that creates a magnetic field. As it spins, this magnetic field interacts with the stator, which is fixed and contains coils of wire. This interaction induces an alternating current (AC) in the stator windings through electromagnetic induction, allowing the alternator to convert mechanical energy into electrical energy. The rotor's motion is typically driven by the engine's crankshaft.
Where is the magnetic field created alternator?
The magnetic field in an alternator is created by the rotor, which is an electromagnet that produces a rotating magnetic field as it spins. This magnetic field induces an alternating current in the stator windings through electromagnetic induction, which is then converted to usable electrical power.
How is automotive alternator initially excited?
An automotive alternator is initially excited through a process called residual magnetism. When the engine starts, the alternator's rotor, which contains permanent magnets or is electromagnetically induced, generates a small magnetic field due to residual magnetism. This initial magnetic field induces a small alternating current (AC) in the stator windings. Once the engine runs, the voltage regulator takes over, supplying a larger current to the rotor's field windings to increase output.
What is the working principal of 3 phase alternator?
A 3 phase alternator is an AC electrical generator with 3 sets of windings in the stator. These windings overlap each other in phase angle, or timing relationship, by 120 degrees with respect to each other. The rotor (field or excitation) current is DC, and is adjusted to regulate the output power.
Where is an alternator's current induced?
An alternator's current is induced in the stator windings, which are stationary components surrounding the rotating rotor. As the rotor, equipped with magnets or electromagnets, spins within the stator, it creates a changing magnetic field, which induces an alternating current (AC) in the stator windings according to Faraday's law of electromagnetic induction. This induced current is then sent out to power electrical systems or charge batteries.
What does a brush do in a alternator?
In an alternator, brushes are conductive components that maintain electrical contact with the rotating part called the rotor. They transfer current from the stationary part of the alternator to the rotor, allowing it to generate a magnetic field. This magnetic field is essential for inducing alternating current (AC) in the stator windings, which is then converted to usable electrical power for the vehicle's electrical system. Proper functioning of the brushes is crucial for the alternator's efficiency and overall performance.
Does armature rotates?
Typically the armature windings are in the stator of a generator, which does not rotate. Typically the field windings are on the rotor, which rotates.
What is inductor alternator?
The armature and the field windings of an inductor alternator are both accommodated in the stator. The three phase ac armature windings are distributed in small slots and the dc field windings are concentrated in two slots in the stator. Each field coil spans half the total number of stator slots. Armature coils are connected in star and field coils are connected in series. The rotor resembles a cogged wheel, with no winding. The core of the stator, which is completely embraced by the field coils, will retain a residual magnetism if excited once. When the rotor is rotated, the passage of the rotor teeth alternatively under the field offers a varying reluctance path for the flux produced by the field coils. This flux, which varies periodically, links with the armature coils and induces an emf in them. The frequency of the induced emf depends on the speed of the rotor. The magnitude depends on the speed of the rotor as well as on the level of excitation. The armature and the field windings of an inductor alternator are both accommodated in the stator. The three phase ac armature windings are distributed in small slots and the dc field windings are concentrated in two slots in the stator. Each field coil spans half the total number of stator slots. Armature coils are connected in star and field coils are connected in series. The rotor resembles a cogged wheel, with no winding. The core of the stator, which is completely embraced by the field coils, will retain a residual magnetism if excited once. When the rotor is rotated, the passage of the rotor teeth alternatively under the field offers a varying reluctance path for the flux produced by the field coils. This flux, which varies periodically, links with the armature coils and induces an emf in them. The frequency of the induced emf depends on the speed of the rotor. The magnitude depends on the speed of the rotor as well as on the level of excitation.
Working principle of 3 phase alternator?
A three-phase alternator has three sets of windings that produce three currents. The three currents make up the three phases. Together these produce the total AC output of the stator. An alternator is made up of a stator and a magnet rotor which is also known as the flywheel.
