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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.
Is slip ring a part attached to each end of the wire loop in an ac generator?
In a very simple, laboratory-type, a.c. generator -yes. In practical generators, the output (armature) windings are part of the stator, so do not rotate and, so, don't require slip rings.
What is the difference between a field winding and an armature winding in any machine?
In electrical machines such as motors and generators, the field winding is responsible for producing a magnetic field within the machine. This magnetic field interacts with the armature winding, which carries the electric current and generates mechanical power. The field winding typically has fewer turns of thicker wire compared to the armature winding, which has more turns of thinner wire to handle higher currents.
Synchro motor and its function?
A Synchro Motor is a Elecrical motor consition out of a single-phase Inner/Rotor windings, and a Three-phase Outer/Stator windings. The Outer/Stator windings are connected Electricly in a Star formation. ... ie: The inner ends of each the three windings are connected to one another. And the outher ends will then be connected to another Synchro Motors outer ends. The Inner/Rotor windings are connected to a single-phase AC power supply. The Rotor Windings in turn transfer energy over to the Outer/Stator windings. The Stator Windings are 120 degrees appart. And therefore depending on the Rotation of the Inner/Rotor Windings the Outer/Stator Winding get a different magnatude of magnetic flux, transferring a different amout of current flow to each of the three Outer/Sator windings. That bring us to the use of a Synchro Motor: ... A Syncrhro Motor works in pairs of 2 or 3, and are used to transfer rotational oriantation from one Synchro motor to another. Depending on how the Synchro Motors are connected to one another you can mirror the rotation from the first motor to the second. For standard Synchronigation you would connect The 3 Outer/Stator windings as such (1-1) (2-2) & (3-3). To mirror the Rotation you could connect (1-2) (2-1) & (3-3). Remember I said you could have 3 Synchro motors... The Third is wired differently inside... it has 3 Inner/Rotor windings & 3 Outer/Stator windings. The Rotor & Stator winding are connected in a star formation. The third Synchromotor bring about a difference in rotation. You could add or subtract rotational oreantions. A = Synchro Motor 1 ...B = Synchro Motor 2 (with 3 Stator & 3 Rotor windings) ...C = Synchro Motor 3 A+B=C Or A-B=C Synchro motors are used in ships, for opening & clossing valves from the bridge to for instance the Engine room. A more advanced system of the synchro technology integrates with a Servo Motor, that in turn can controls the rudder of the ship. Other uses are in Analoge computers & Electronic Weapon Guidence Systems.
What does the commutator in an electrical motor do?
If there is a commutator, it means you are dealing with a DC motor.The commutator acts like a switch to supply voltage to a revolving armature from the stationary brush assembly.A commutator has commutator bars, each seperated by mica insulation. Each coil of the rotating armature is connected to two bars that are in directly opposite positions across each diameter of the armature.The total number of commutator bars depends on the design of the windings on the armature: either "lap" or "wave" windings can be used on a DC motor or generator which is provided with a commutator.For more information see the answer to the Related question and also the Related link shown below.
How many windings are in universal motor?
one windingAnswerA three-phase motor has three phase windings, normally (but not necessarily) connected in delta.
How emf is induced in dc motor?
In brief,in a 3 phase SQIM,there are 3 windings per pole in the stator physically 120 degree apart,each of which is fed from per phase of a balanced 3 phase ac supply.As the magnetic field due to current in each winding varies with time as the current is alternating,the resultant field will be found to keep on changing its direction with time in a circular locus,magnitude being constant because of this setup which can be shown mathematically.Thus a rotating flux of constant mag links the rotor which induces an emf in the rotor,though initially both rotor & stator are static.Another AnswerA three-phase induction motor is, essentially, a transformer. The 'primary' windings being the stator's field windings, and the 'secondary' winding being the bars of the rotor. For this reason, induction motors are often termed 'rotary transformers'. So emfs are induced into the bars by 'transformer action'.Unlike a 'static' transformer, however, the secondary voltages and the frequencies of the voltages vary with the speed of the rotor.
Explain the working principle of shunt generator?
A shunt generator is a machine with a rotating set of coils of wire embedded in the iron core in its armature (the spinning part), and a 'commutator' and brushes that carry the current from the (spinning) windings on the armature to the stationary external electrical load. It also has a 'field' winding that creates a stationary magnetic field inside the machine, that the armature coils are spun in. As the windings spin, they cut the stationary field and generate an alternating voltage. As well as providing a moving connection to the coils, the commutator and brushes act like a switch, reversing the connections from the coils to the external circuit each time the waveform changes polarity from positive to negative and vice versa. This creates direct current in the external circuit and load. In a shunt generator, the field windings are connected in parallel with the armature ('shunt' is a common term for 'in parallel') and the field gets its power ('excitation') from the armature - the machine is 'self-excited'. A self-excited generator needs a small 'residual field' in the field's iron core so it can generate a small output from the armature when starting, which is fed to the field, boosting the armature output, which is fed to the field.... and so on, until the field iron core saturates with flux, and the field stops strengthening. Shunt generators are the 'workhorse of the small generator market - they are cheap and simple, have an output voltage that 'droops' a little with increasing load, and most shunt generators can safely be short-circuited - this takes the electrical energy away from the field, and the armature can usually develop only a small output current - not enough to damage it.
How are generators different from electric motors?
They both use the same parts, but work differently in the way electricity is applied to them. The basic components of each are a stator (stationary part), a rotor (rotating part), and a wire coil. In an electric generator, the rotor is mechanically driven by an armature and has a wound wire coil around it. The stator in a generator contains permanent magnets, and when the coil spins around them, it generates voltage, which is conducted to a battery or other device. In an electric motor, electricity is applied through the stator to force the rotor to spin. When a section of the stator is electrified, it produces a positive magnetic charge, which attracts the rotor and forces it to turn toward that part of the stator. The magnetic charge in the stator moves to each section, causing the rotor to follow it at high speed.
The commutator of a universal motor connects each armature coil to?
to a brush
Why a three phase induction motor self starting?
The continually expanding and contracting magnetic fields set up in each of the three windings, which are 120 degrees apart, combine, to form a resultant field that rotates within the stator, sweeping around the air gap. This induces voltages into the rotor bars, and the magnetic fields set up by the resulting rotor currents combine with the rotating stator field, dragging the rotor around with them.
What is the working principle of a DC shunt motor?
To ensure that the Lathe machine's motor working properly, DC motor starter is added in which it used to protect motor against damage from: • short-circuit, • long term overload, • excessive starting current, and yet to made the operating speed of motor easily to be control by operator. During starting, the motor is not turning, hence there is no internal voltage .The internal resistance is very low and thus the current flow through is very high. This condition may cause damage to the motor Hence, a staring resistor is added in which connect in series with the armature to limit the current flow until the internal voltage of motor is increasing to do the limiting. In order to prevent losses as the speed of the motor is build up; the starting resistor should be removed
