What Is Generator?
Generator, also called dynamo, any machine that converts mechanical energy to electricity for transmission and distribution over power lines to domestic, commercial, and industrial customers. Generators also produce the electrical power required for automobiles, aircraft, ships, and trains.
What is generator and its working?
Generator is a machine that converts mechanical energy into electrical energy. It works based. on principle of faraday law of electromagnetic induction. The faradays law states that. whenever a conductor is placed in a varying magnetic field, EMF is induced and this induced.
What Is Types Generator?
The generators are classified into types.
- AC generators
- DC generators
These are also called as alternators. It is the most important means of producing electrical power in many of the places since now days all the consumers are using AC. It works based on principle of the electromagnetic induction. These are of two types one is induction generator and other one is synchronous generator. The induction generator requires no separate DC excitation, regulator controls, frequency control or governor. This concept takes place when conductor coils turn in a magnetic field actuating a current and a voltage. The generators should run at a consistent speed to convey a stable AC voltage, even no load is accessible.
Advantages of AC Generator:
- These Generators are generally maintenance free, because of absence of brushes.
- Easily step up and step down through transformers.
- Transmission link size might be thinner because of step up feature
- Size of the generator relatively smaller than DC machine
- Losses are relatively less than DC machine
- These Generator breakers are relatively smaller than DC breakers
DC generator is typically found in off-grid applications. These generators give a seamless power supply directly into electric storage devices and DC power grids without novel equipment. The stored power is carries to loads through dc-ac converters. The DC generators could be controlled back to an unmoving speed as batteries tend to be stimulating to recover considerably more fuel.
Classification of DC Generators
D.C Generators are classified according to the way their magnetic field is developed in the stator of the machine.
- Permanent-magnet DC generators
- Separately-excite DC generators and
- Self-excited DC generators.
Permanent magnet DC generators do not require external field excitation because it has permanent magnets to produce the flux. These are used for low power applications like dynamos. Separately-excite DC generators requires external field excitation to produce the magnetic flux. We can also vary the excitation to get variable output power. These are used in electro plating and electro refining applications. Due to residual magnetism present in the poles of the stator self-excited DC generators can able to produce their own magnetic field ones it is started. The self-excited DC Generators are further classified as Shunt wound DC generators; Series wound DC generators and Compound wound DC generators. The Compound Wound DC generators are further divided as long shunt wound DC generators, and short shunt wound DC generators. The field pole of the DC generator are stationary, and the armature conductor rotates. The voltage generated in the armature conductor is of alternating nature, and this voltage is converted into the direct voltage at the brushes with the help of the commutator. These are simple in design and no need to have the external circuit to vary the field excitation. Again these self-excited DC generators are classified into shunt, series, and compound generators. These are used in applications like battery charging, welding, ordinary lightening applications etc.
Advantages of DC Generator:
- Mainly DC machines have the wide variety of operating characteristics which can be obtained by selection of the method of excitation of the field windings.
- The output voltage can be smoothed by regularly arranging the coils around the armature .This leads to less fluctuations which is desirable for some steady state applications.
- No shielding need for radiation, so cable cost will be less as compared to AC.
What Is A Generator Used For?
Generators are useful appliances that supply electrical power during a power outage and prevent discontinuity of daily activities or disruption of business operations. Generators are available in different electrical and physical configurations for use in different applications.
Generator Prices In Ghana:
DuroStar DS4000S 4000 Watt Portable Recoil Start Gas Fuel Generator – GHC 2,400.00
Westinghouse WGen9500 Heavy Duty Portable Generator – 9500 Rated Watts & 12500 = GHC 8,800.00
Champion 3800-Watt Dual Fuel RV Ready Portable Generator With Electric Start = GHC 4,500.00
Diesel. Japan 10kva 13000wax Supper Generator Honda = GHC 7,000