The series DC generator is used in arc lamps for stable current generator, lighting and booster. The separately excited type DC generator is used for power and lighting purposes using the field regulators. The three types of self-excited DC generators are:Īpplications of DC generators are as follows: Mechanical Losses- Losses which occur because of friction between the parts of the generator are called mechanical losses. These losses are also called Core losses or Magnetic losses. Iron Losses- Due to the induction of current in the armature, eddy current losses and hysteresis loss occur. These losses are classified into mainly three types:Ĭopper Loss- These losses occur while current flows through windings and are of three types: armature copper loss, field copper winding loss and losses because of brush resistances. While converting the mechanical energy into electrical energy, there are losses of energy i.e. Z - Total number of armature conductors in the field.Ī - number of parallel paths in the armature. The EMF equation for DC generator is expressed as:Į g - Generated EMF across any parallel path Thus, we get unidirectional current at the terminals. As the connections of armature conductors get reversed, a current reversal takes place. The direction of the current will be alternating. As the armature completes its half rotation the direction of movement of the conductor will get reversed downward. The direction of the induced current (given by Fleming’s right-hand rule) changes as the direction of movement of the conductor changes.įor example, consider the case, an armature rotating in clockwise direction and conductor at the left moving in an upward direction. If the conductor is guided with a closed path, the current will get induced. According to Faraday’s law, whenever a conductor is placed in a fluctuating magnetic field (or when a conductor is moved in a magnetic field) an EMF is induced in the conductor. To convert induced alternating current into direct current.Ī DC generator operates on the principle of Faraday’s laws of electromagnetic induction. To connect stationary external circuits to the rotating armature conductors through brushes and Several wedge-shaped, hard drawn copper segments form a commutator. The pole shoe is fixed to Yoke.Ĭommutator - The commutator is cylindrical in shape. Pole Shoe - To protect the field coil from falling and to enhance the uniform spread of magnetic flux pole shoe is used. It increases the cross-sectional area of the magnetic circuit, which results in a uniform spread of magnetic flux. Poles - The main function of the poles is to support the field coils. It provides support to main poles and inter poles and gives a low reluctance path for the magnetic flux. Yoke - The outer hollow cylindrical structure is known as Yoke. When current flows through them, adjacent poles acquire opposite polarity. The field coils of all the poles are connected in series. Because of them, the actual conversion of power takes place.įield Coils - To produce the magnetic field, field coils are placed over the pole core. These slots accommodate armature winding in it.Īrmature Winding - These are the insulated conductors placed in the armature core. Rotor - A rotor is a cylindrical laminated armature core with slots.Īrmature Core - The armature core is cylindrical in shape and has grooves on the outer surface. The purpose of the stator is to provide a magnetic field in the region where the coil spins. Stator - A stator is a set of two magnets placed in such a way that opposite polarity faces each other. DC generators supply continuous power to electric storage instruments and power grids (DC).ĭC Generator consists of the following parts. These generators are most suitable for off-grid applications. In DC generators, the energy conversion is based on the principle of dynamically induced EMF production. However, a generator that converts mechanical energy into alternating current electricity is an AC generator.ĭo you know why we study generators in their working principle? On this page, we will get to resolve all our queries on the DC generator's parts,working principle and how we describe it in mathematical terms. There are two types of generators,Ī DC generator is the type of electrical generator that converts mechanical energy into direct current electricity. The electrical energy generated is further transmitted and distributed through power lines for domestic, commercial use. Machines that convert mechanical energy into electrical energy are called Electric Generators.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |