Application of dc generator

Explore the intricacies of Direct Current (DC) generators, their types, applications, performance factors, and future potential in this comprehensive guide. Understanding Direct Current (DC) Generators Electricity is a fundamental component of our everyday lives, and the devices that generate it, particularly Direct Current (DC) Generators, are incredibly crucial in this regard. Understanding their functionality provides a valuable insight into the underpinnings of the electrical world around us. The Basics of DC Generators Direct Current or DC generators are devices that convert mechanical energy into direct current electrical energy. This is achieved through the principles of electromagnetic induction, a concept first discovered by scientist Michael Faraday in the early 19th century. He demonstrated that a change in the magnetic field within a closed loop of wire induces an electromotive force (EMF), leading to the flow of electric current. At their core, DC generators consist of a stationary magnetic field, a rotating armature, slip rings, brushes, and a commutator. The mechanical energy, which is often supplied by a prime mover such as an internal combustion engine or a turbine, drives the rotation of the armature. As the armature rotates within the magnetic field, it cuts through magnetic lines of force, generating an EMF. Types of DC Generators • Separately Excited DC Generators: These generators have their field magnet windings powered by an independent external DC ...

There are different types of DC generators are available for the various types of applications. The applications of various types of DC generators based on their characteristics are as follows − Applications of Separately Excited DC Generators A separately excited DC generator requires an independent external DC source for the excitation of field winding. Thus, it is expensive and being rarely used. Following are some application of separately excited DC generators − • These are able to produce a wide range of voltage output, they are primarily used in laboratory and commercial testing. • These are used in speed regulation tests. • These generators operate in a stable condition with any change in field excitation. Therefore, they are also used in supplying power to the DC motors, whose speed being to be controlled. Applications of Series DC Generators A series DC generator has limited applications. Some of the applications of a series DC generator are as follows • The rising characteristics of a series DC generator makes it suitable for voltage boosting applications in the feeders in the various types of distribution systems. • A series DC generator has the tendency to supply constant load current. Hence, several series generators can be connected in series to provide high voltage DC power transmission at constant load current. • The series DC generators are also used in supplying field excitation current in DC locomotives for regenerative breaking. • The series generators...

APPLICATIONS OF DC GENERATOR DC Separately Exited Generator: As a supply source to DC Motors, whose speed is to be controlled for certain applications. Where a wide range of voltage is required for the testing purposes. DC Shunt Generator The terminal voltage of DC shunt generator is more or less constant from no load to full load .Therefore these generators are used where constant voltage is required. For electro plating B attery charging For excitation of Alternators. DC Series Generator The terminal voltage of series generator increases with load current from no load to full load .Therefore these generators are, Used as Boosters Used for supply to arc Lamps DC Compound Generator: Differential Compound generators are used to supply dc welding machines. Level compound generators are used to supply power for offices, hostels and Lodges etc. Over compound generators are used to compensate the voltage drop in Feeders. An electrical generator is a device that converts mechanical energy to electrical energy, generally using electromagnetic induction. The source of mechanical energy may be a reciprocating or turbine steam engine, water falling through a turbine or waterwheel, an internal combustion engine, a wind turbine, a hand crank, or any other source of mechanical energy. • Prev Page •

Separately excited DC generator application • Separately excited generators are generally more expensive than self-excited generators because they require a separate source of supply. As a result they are generally used where self-excited are relatively unsatisfactory. • These are use in Ward Leonard systems of speed control, as self-excitation would be unsuitable at lower voltages. • These generators are also used where quick and requisite response to control is important (as the separate excitation field gives a faster and more accurate response to changes in the circuit’s See also this : Shunt generator application • Shunt generators with field regulators are use for general lighting and power supply purposes. • These generators are use to advantage, in conjunction with automatic regulators, as exciters to supply the current required to excite the fields of AC generators. • The regulator controls the excitor’s voltage by cutting in and out some of the resistance of the shunt-field rheostat, thereby holding the voltage at whatever value is demanded by operating conditions. This is one of the most important applications of shunt generators. • Shunt generator also use for charging batteries because their terminal voltages are almost constant or can be kept constant. See also this : Series generator application Series generators are not use for power supply because of their rising characteristics. However, their rising characteristic makes them suitable for use as boosters ...

A generator (alternator) is a machine that uses electromagnetic induction to convert mechanical energy into electrical energy. A direct current (DC) generator works on the principle that a voltage is induced in a conductor coil when it is rotated in a magnetic field. The rate at which the coil rotates in the magnetic field determines the amount of voltage induced in the coil. When a conductor coil rotates at a constant rate in a magnetic field, the voltage induced in the coil is proportional to the rate of change of magnetic flux through the coil loops at any given instant of time. DC generators are made up of field windings, an armature, a commutator, brushes, and a frame (see Figure 1). Figure 1. DC generators are made up of field windings, an armature, a commutator, brushes, and a frame. Field Windings Field windings are used in generators to produce the required magnetic field. The magnetic field can also be created by permanent magnets. Permanent magnets are used in magnetos, which are very small machines. A permanent magnet's magnetic lines of force decrease as it gets older, and its strength cannot be adjusted for control purposes. Electromagnets, which must be supplied with current, are used in the majority of generators. If the current for the field windings is provided by an external source (another generator or a battery), the generator is separately excited. The generator is termed as self-excited if it supplies its own current for the field windings. Generally...

Construction It consists of a frame called the Yoke, pole core, armature core, armature windings, commutator, brushes, and bearings. The yoke is the outer part of the machine that is used for protecting it against environmental issues. Hence, protecting shield for the machine. It is also used as a mechanical support for the pole core. In small generators, Yoke is made of Cast Iron whereas, in large generators, the yoke is made of cast steel. Field magnets consist of pole core and pole shoe and these magnets get magnetized when current is flown through the winding. The field winding rests on the pole shoe which is responsible for the production of a magnetic field. Field magnets are responsible for expanding the flux throughout the airgap. Due to the large space available inside the machine, the reluctance of the magnetic path is less. Armature provides space for the armature conductors to be housed on it. It is normally made of some circular sheet laminations of 0.5mm thickness. The figure below depicts how armature laminations are punched. Armature windings are employed on the armature of a machine. Usually, armature core outer diameter is punched at regular intervals to house the armature conductors. A commutator consists of some segments made of mics. It is used for accumulating current from the armature conductors and then, it converts the AC to unidirectional current. Brushes are housed inside the brush holders and are rectangular. These are made of either carbon or g...

In the present day world, electrical energy is generated in bulk in the form of an alternating current. Hence, the use of DC machines, i.e., DC generators and motors are very limited. They are mainly used in supplying excitation of small and medium-range alternators. The Industrial Applications of DC Machines are in Electrolytic Processes, Welding processes and Variable speed motor drives. Contents: • • Nowadays, the alternating current is generated first and then it is converted into DC by the rectifiers. Thus, DC generator has generally been suppressed by a rectified AC supply for many applications. Direct current motors are very commonly used as variable speed drives and in applications where severe torque variations occur. Applications of DC Motors The main applications of the three types of direct current motors are given below. Series Motors The series DC motors are used where high starting torque is required and variations in speed are possible. For example – the series motors are used in the traction system, cranes, air compressors, Vaccum Cleaner, Sewing machine, etc. Shunt Motors The shunt motors are used where constant speed is required and starting conditions are not severe. The various applications of DC shunt motor are in Lathe Machines, Centrifugal Pumps, Fans, Blowers, Conveyors, Lifts, Weaving Machine, Spinning machines, etc. Compound Motors The compound motors are used where higher starting torque and fairly constant speed is required. The examples of usa...