Electra

Most Common DC Generator Types

           Machines can be altered according to the certain requirements.

The types for the DC Generator can be obtained based on connecting field and the armature as well as by means of excitation. The main two categories are the Self excited and the separately excited classified based on the excitation.

The self excited is one which does not need separate source for exciting its own field winding. It is further classified in to three types based on the connection of field and the armature.

1) The series wound Generator is a type in which the field is connected in series with the armature. Here field made of thick wire as it has to pass the entire armature current.

2) The shunt wound Generator can be build by connecting the field across the armature. Here it is not necessary to have field made of thick wire.

3) Compound wound Generator is simply the combination of series and the shunt wound generator.

            In the separately excited generators the field winding is connected to the separate source of supply other than the armature.

Know about the PRINCIPLE OF AN ALTERNATOR

           A.C. generators are generally referred as alternators.

They operate under the principle of electromagnetic induction.

 The principle is when a conductor cuts the magnetic flux, e.m.f. is induced in the conductor by the principle of Faraday’s Law of Electromagnetic Induction, this induced e.m.f. causes a current flow in the conductor when the conductor is connected to a closed circuit.

The principle is similar to the D.C. generator, but the difference in alternator is the armature will be stator while the field rotates. The armature winding is mounted on the stationary element called as stator and field winding is mounted on the rotating element called as the rotor.

Stator consists of stator frame made of cast-iron, which is the outer most layer of the alternator. Rotor is represented by alternate north and south poles that are fixed to the outer rim like a flywheel.

The magnetic poles are excited by a d.c. supply. The rotor rotates and the stator will cut the magnetic flux lines developing e.m.f. in it.

This e.m.f. will induce current in the conductor which is allowed to pass through a closed circuit. The direction of alternating e.m.f. is given by Fleming’s Right Rule.

Principle and Operation behind a DC Generator

             Power is the main source for our world to move ahead. Generator plays a major role in producing power. I will provide the details of DC Generator that everyone must learn.

DC Generator is a machine which helps in converting Mechanical energy into Electrical energy. The three main things to be needed for the operation of DC Generator are the Magnetic Field, a Conductor and the Motion of the conductor.

Generator consists of an armature and the Field magnet. Field Magnet is responsible for producing the required magnetic field. The conductors are wound over the armature in which the electro motive force is induced by revolving the armature within the field magnet.

The resultant emf developed in the armature is the alternating one. But we need the DC. For that commutator is used which converts the alternating emf into direct current. Commutator rectifies the AC into DC. The DC obtained can be used for various purposes.