Dc Generator Construction And Working Principle Pdf

dc generator construction and working principle pdf

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A DC Generator is an electrical device which converts mechanical energy into electrical energy. It mainly consists of three main parts, i. The other parts of a DC Generator are magnetic frame and yoke, pole core and pole shoes, field or exciting coils, armature core and windings, brushes, end housings, bearings and shafts.

In a separately excited generator field winding is energized from a separate voltage source in order to produce flux in the machine. So long the machine operates in unsaturated condition the flux produced will be proportional to the field current. In order to implement shunt connection, the field winding is connected in parallel with the armature. It will be shown that subject to fulfillment of certain conditions, the machine may have sufficient field current developed on its own by virtue of its shunt connection.

Commutator (electric)

A DC Generator is an electrical device which converts mechanical energy into electrical energy. It mainly consists of three main parts, i. The other parts of a DC Generator are magnetic frame and yoke, pole core and pole shoes, field or exciting coils, armature core and windings, brushes, end housings, bearings and shafts.

The Magnetic Field System is the stationary or fixed part of the machine. It produces the main magnetic flux. These various parts of DC Generator are described below in detail. The outer hollow cylindrical frame to which main poles and inter-poles are fixed and by means of which the machine is fixed to the foundation is known as Yoke.

It is made of cast steel or rolled steel for the large machines and for the smaller size machine the yoke is generally made of cast iron. The Pole Core and Pole Shoes are fixed to the magnetic frame or yoke by bolts.

Since the poles, project inwards they are called salient poles. Each pole core has a curved surface. Usually, the pole core and shoes are made of thin cast steel or wrought iron laminations which are riveted together under hydraulic pressure. The poles are laminated to reduce the Eddy Current loss. Each pole core has one or more field coils windings placed over it to produce a magnetic field.

The enamelled copper wire is used for the construction of field or exciting coils. The coils are wound on the former and then placed around the pole core.

When direct current passes through the field winding, it magnetizes the poles, which in turns produces the flux. The field coils of all the poles are connected in series in such a way that when current flows through them, the adjacent poles attain opposite polarity. The armature consists of a shaft upon which a laminated cylinder, called Amature Core is placed. The armature core of DC Generator is cylindrical in shape and keyed to the rotating shaft.

At the outer periphery of the armature has grooves or slots which accommodate the armature winding as shown in the figure below:. As the armature is a rotating part of the DC Generator or machine, the reversal of flux takes place in the core, hence hysteresis losses are produced. The silicon steel material is used for the construction of the core to reduce the hysteresis losses. The rotating armature cuts the magnetic field, due to which an emf is induced in it. This emf circulates the eddy current which results in Eddy Current loss.

Thus to reduce the loss the armature core is laminated with a stamping of about 0. Each lamination is insulated from the other by a coating of varnish.

The insulated conductors are placed in the slots of the armature core. The conductors are wedged, and bands of steel wire wound around the core and are suitably connected. This arrangement of conductors is called Armature Winding. The armature winding is the heart of the DC Machine.

Armature winding is a place where the conversion of power takes place. In the case of a DC Generator here, mechanical power is converted into electrical power. On the basis of connections, the windings are classified into two types named as Lap Winding and Wave Winding.

In lap winding, the conductors are connected in such a way that the number of parallel paths is equal to the number of poles. In lap winding, the number of brushes is equal to the number of parallel paths.

Out of which half the brushes are positive and the remaining half are negative. In wave winding, the conductors are so connected that they are divided into two parallel paths irrespective of the number of poles of the machine. In this case number of brushes is equal to two, i. The commutator, which rotates with the armature, is cylindrical in shape and is made from a number of wedge-shaped hard drawn copper bars or segments insulated from each other and from the shaft.

The segments form a ring around the shaft of the armature. Each commutator segment is connected to the ends of the armature coils. Carbon brushes are placed or mounted on the commutator and with the help of two or more carbon brushes current is collected from the armature winding. Each brush is supported in a metal box called a brush box or brush holder. The brushes are pressed upon the commutator and form the connecting link between the armature winding and the external circuit. The pressure exerted by the brushes on the commutator can be adjusted and is maintained at a constant value by means of springs.

With the help of the brushes, the current which is produced on the windings is passed on to the commutator and then to the external circuit. They are usually made of high-grade carbon because carbon is conducting material and at the same time in powdered form provides a lubricating effect on the commutator surface. End housings are attached to the ends of the Mainframe and provide support to the bearings.

The front housings support the bearing and the brush assemblies whereas the rear housings usually support the bearings only. The ball or roller bearings are fitted in the end housings. The function of the bearings is to reduce friction between the rotating and stationary parts of the machine.

Mostly high carbon steel is used for the construction of bearings as it is a very hard material. The shaft is made of mild steel with a maximum breaking strength. The shaft is used to transfer mechanical power from or to the machine. The rotating parts like armature core, commutator, cooling fans, etc. Superb explanation, your proposed information is highly appreciated and the diagrams are very clear….

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Construction of a DC Generator

In a separately excited generator field winding is energized from a separate voltage source in order to produce flux in the machine. So long the machine operates in unsaturated condition the flux produced will be proportional to the field current. In order to implement shunt connection, the field winding is connected in parallel with the armature. It will be shown that subject to fulfillment of certain conditions, the machine may have sufficient field current developed on its own by virtue of its shunt connection. In series d.

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Principle of DC Generator

What is a DC Generator : Construction and Its Working

A rotating armature coil passes through a magnetic. A dc generator is an electrical machine which converts mechanical energy into direct current electricity. Page 3. Basic construction and working of a DC Generator. The initial electromagnetic generator Faraday disk was invented by British scientist namely Michael Faraday in the year A DC generator is an electrical device used for generating electrical energy. The main function of this device is to change mechanical energy into electrical energy. There are several types of mechanical energy sources available such as hand cranks, internal combustion engines, water turbines, gas and steam turbines.

Electric motors and generatorsJitendra kumar 2. DC Generator A dc generator is an electrical machine which converts mechanical energy into direct current electricity. This energy conversion is based on the principle of production of dynamically induced emf. This electromotive force can cause a flow of current when the conductor circuit isConstruction of a DC Generator - explanation of its,,Construction of a DC Generator A DC Generator is an electrical device which converts mechanical energy into electrical energy. It mainly consists of three main parts, i.

An electrical DC generator is a machine which turns mechanical energy into electrical energy. Or in other words it is a machine which converts mechanical energy into a direct current. The energy conversion takes place on the principle of the production of the dynamically induced e. This induced e. The DC generator consists of a single-turn rectangular copper coil ABCD rotating about its own axis placed magnetic field provided by electromagnets and permanent magnet shown in the figure. The ends of the coil are connected to the central shaft consisting of two slip rings that are insulated from each other. When the plane of the coil ABCD is at right angles to the line of flux i.

DC Generator: Types, Working Principle, Construction Applications

Armature of DC Generator

A commutator is a rotary electrical switch in certain types of electric motors and electrical generators that periodically reverses the current direction between the rotor and the external circuit. It consists of a cylinder composed of multiple metal contact segments on the rotating armature of the machine. Two or more electrical contacts called " brushes " made of a soft conductive material like carbon press against the commutator, making sliding contact with successive segments of the commutator as it rotates. The windings coils of wire on the armature are connected to the commutator segments. Commutators are used in direct current DC machines: dynamos DC generators and many DC motors as well as universal motors.

General Information: Emergency Contact: Email: contactus powerplus. Is your business in need of an AC generator or a DC backup generator? Can you tell the difference between the types of generators available on the market and which one best fits your needs? Here is what you need to know so you can invest in the right generator for your business. In order to determine which generator you need, you should understand a few things first.

DC Motors Although ac motors are used in most of the cases, DC motors have many applications and used for multipurpose applications DC Motor Principle A machine that converts dc power into mechanical energy is known as dc motor Its operation is based on the principle that when a current carrying conductor is placed in a.

The initial electromagnetic generator Faraday disk was invented by British scientist namely Michael Faraday in the year A DC generator is an electrical device used for generating electrical energy. The main function of this device is to change mechanical energy into electrical energy. There are several types of mechanical energy sources available such as hand cranks, internal combustion engines, water turbines, gas and steam turbines. The generator provides power to all the electrical power grids.

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