Alternator Construction And Working Pdf

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In Alternators are created by Hippolyta Pixii the French inventor. An alternator is defined as a machine or generator which produces AC Alternating Current supply and it converts mechanical energy into electrical energy, so it is also called an AC generator or synchronous generator.

An alternator is an electrical machine which converts mechanical energy into alternating electric energy.

Alternator

Facebook Twitter. Synchronous Generator or Alternator:. It is known that the electric supply used now-a-days for commercial, as well as domestic purposes, is of alternating type. Similar to d. Machines generating ac EMF are called alternators or synchronous generators. While the machines accepting input from a. Difference between DC Generator and Alternator:. It is seen that in the case of a d. By using commutator and brush assembly it is converted to d.

If commutator is dropped from a d. Such a machine without a commutator, providing an a. This textbook " Electrical Machinery by P. Bhimbhra " is the best in industry. Grab it now for very less price. Construction of Synchronous generator or alternator:. The stator in the synchronous generator is a stationary armature. This consists of a core and the slots to hold the armature winding similar to the armature of a d.

The stator core uses a laminated construction. It is built up of special steel stampings insulated from each other with varnish or paper. The laminated construction is basically to keep down eddy current losses.

Generally choice of material is steel to keep down hysteresis losses. The entire core is fabricated in a frame made of steel plates. The core has slots on its periphery for housing the armature conductors. The frame does not carry any flux and serves as the support to the core. Ventilation is maintained with the help of holes cast in the frame. This is also called projected pole type as all the poles are projected out from the surface of the rotor.

The poles are built up of thick steel laminations. The pole face has been given a specific shape. The field winding is provided on the pole shoe. These rotors have large diameters and small axial lengths. The limiting factor for the size of the rotor is the centrifugal force acting on the rotating member of the machine. As the mechanical strength of salient pole type is less, this is preferred for low-speed alternators ranging from r.

The prime movers used to drive such rotor are generally water turbines and I. This is also called non-salient type or non-projected pole type or round rotor. This rotor consists of a smooth solid steel cylinder, having a number of slots to accommodate the field coil. These slots are covered at the top with the help of steel or manganese wedges.

The unslotted portions of the cylinder itself act as the poles. The poles are not projecting out and the surface of the rotor is smooth which maintains a uniform air gap between stator and rotor. These rotors have small diameters and large axial lengths. This is to keep peripheral speed within limits. Such high-speed alternators are called 'turbo-alternators'. The prime movers used to drive such type of rotors are generally steam turbines, electric motors. The alternators work on the principle of electromagnetic induction.

When there is a relative motion between the conductors and the flux, emf gets induced in the conductors. The dc generators also work on the same principle. Let conductor starts rotating from position 1. Hence there is no cutting of flux lines by the conductor.

The magnitude of such an induced emf increases as conductor moves from position 1 to 2. Hence there exists cutting of the flux lines. And at this instant, the induced emf in the conductor is at its maximum. As the conductor moves from 3 to 4, velocity component perpendicular to the flux lines again starts increasing.

This cycle continues as conductor rotates at a certain speed. So if we plot the magnitudes of the induced emf against the time, we get an alternating nature of the induced emf shown figure above. This is the working principle of Synchronous generator or Alternator. Tags Machines. You might like Show more. Previous Post Next Post. Contact form. LinkList ul li ul'.

What is an Alternator : Construction, Working and Its Applications

Basically, an AC generator is an electrical machine that converts mechanical energy into electrical energy in the form of Alternating Current AC. Basic principle behind the working of an AC synchronous generator is also Faraday's law of electrical induction , somewhat similar to working of a DC generator. If a closed path is provided to the conductor, induced emf causes current to flow in the circuit. Now, in the above figure, let the conductor coil A-B-C-D is placed in a magnetic field. Direction of the magnetic flux will be from N pole to S pole.


The cylindrical construction of the rotor gives better balance and quieter-​operation and also less windage losses. Damper Windings. Damper Windings.


Alternator Construction and Working 18-07-2016

Facebook Twitter. Synchronous Generator or Alternator:. It is known that the electric supply used now-a-days for commercial, as well as domestic purposes, is of alternating type. Similar to d. Machines generating ac EMF are called alternators or synchronous generators.

Principle & working of Synchronous generator or Alternator

What is an Alternator – Construction, Working & Applications

Alternators or synchronous generators can be classified in many ways depending upon their application and design. According to application these machines are classified as-. Automotive type - used in modern automobile. Diesel electric locomotive type - used in diesel electric multiple units. Marine type - used in marine. Brush less type - used in electrical power generation plant as main source of power. Radio alternators - used for low brand radio frequency transmission.

An electrical generator is a machine that converts mechanical energy into electrical energy. Based on its operation, it is classified as AC and DC generator. An AC generator is more advantageous compared to a DC generator.

An alternator is an electrical generator that converts mechanical energy to electrical energy in the form of alternating current. In principle, any AC electrical generator can be called an alternator, but usually the term refers to small rotating machines driven by automotive and other internal combustion engines. An alternator that uses a permanent magnet for its magnetic field is called a magneto. Alternators in power stations driven by steam turbines are called turbo-alternators. Alternating current generating systems were known in simple forms from the discovery of the magnetic induction of electric current in the s.

Alternator Construction and Working 18-07-2016

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AC synchronous generator (alternator) - construction and working

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2 Response
  1. VisitaciГіn A.

    An alternator has 3,-phase winding on the stator and a d.c. field winding Rotor construction is of two types, namely;. 1. noiseless operation at high speeds. b.

  2. AndrГіmeda M.

    Salient pole type: Salient pole type rotor is used in low and medium speed alternators. The construction of an AC synchronous generator of a salient pole type rotor is shown in the figure above. This type of rotor consists of a large number of projected poles (called salient poles), bolted on a magnetic wheel.

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