The electric generator

Generators are devices that can be used as alternative to the current supply. They’re also used in industries including road construction, mining, offshore drilling, outdoor shooting, and event management to meet power demands. 

Generators use the principle of electromagnetic induction to generate electric energy in the form of current and voltage. We will learn about the different types of generators, based on their purpose, the different types of fuel used, and we will also explore some crucial questions.

Generator

Essentially, a generator is a device that converts mechanical energy into electrical energy (which can be from coal, oil, natural gas, wind, water, nuclear processes, or other sources). When we apply torque to the generator, it continues to rotate. 

Rotational mechanics occurs as a result of mechanical energy. We obtain electricity as a result of our movement. It is based on the idea of conserving energy. According to the law of conservation of energy, the generator does not create energy; instead, it changes one type of energy into another.

Working Principle of a Generator

Electric generators are built on the principle of electromagnetic induction. Between the poles of a horseshoe-type magnet, a conductor coil (a copper coil wound tightly over a metal core) is rapidly rotated.

A conductor coil plus a core make up an armature. Connecting the armature to a shaft of a mechanical energy source, such as a motor, causes it to rotate. Engines that run on fossil fuels, such as diesel, gasoline, natural gas, and so on, can provide the mechanical energy required, as can renewable energy sources that are not permanently placed and hence easy to start.

The total number of magnetic field lines passing through a given area is known as magnetic flux. So, by moving a coil relative to a magnet, we change the magnetic flux associated with the coil, which causes the coil to generate emf.

Types of Generator

There are two types of Generators

• AC Generators
• DC Generators

AC Generators

Alternator is another name for it. It’s a method of generating electricity in a number of places. Nowadays, everyone uses air conditioning. The electromagnetic induction law governs its operation. Induction and synchronous AC generators are the two types of AC generators.

Advantages of an AC Generator

• Cost-effective.
• Since it requires less maintenance, it is suitable for compact and electrical gadgets in the office.

DC Generator

Mechanical energy is converted into direct current electricity by a DC generator. This type of electric generator does not vary the direction or magnitude of the electricity it produces. As a result, DC’s frequency is always 0.

Except for the replacement of slip rings as sliding contacts in AC generators with split rings or commutators in DC generators, the principle, design, and operation of AC and DC generators are very similar.

Parts of Electric Generator

Armature

It is made up of an insulated copper coil wound around a rectangular frame and a laminated soft iron core.

Field Magnet

A permanent magnet (in a small dynamo) and an electromagnet (in a large commercial dynamo, which is nothing more than the electric generator we are currently studying) supply the magnetic field.

Slip Rings in AC Generator

They’re hollow metal rings that are held at various heights. One ring is attached to one end of the armature, while the other is connected to the other ring. The armature rotates, and these rings revolve with it.

Slip rings in DC Generator

The same ring in two sections. The armature’s ends are attached to these two parts of the same ring. The armature rotates these rings.

Brushes or Sliding Contacts

These are carbon rods or flexible metal plates. They are always in contact with the rings. They aid in the transmission of the induced current generated by the armature and rings to the external circuit.

Application of Electric Generator

Generally an Electric Generator is used in various places which are listed below:

• For large-scale production of electricity from wind energy, electric generators are installed at the wind farm’s windmills. Wind energy is turned into mechanical energy, which is then converted into electrical energy in this scenario.
• At geothermal power stations, an electric generator is installed to heat water using geothermal energy. As a result of the steam generated, the turbine turns, converting geothermal energy to mechanical energy and then to electrical energy.
• At hydroelectric power plants, electric generators are installed. Water rushing through the dam’s gates drives the turbine, which generates energy via an electric generator. The kinetic energy of moving water is turned here into mechanical energy, which is then converted into electrical energy.
• At nuclear power plants, electric generators are deployed. The nuclear reactor at the nuclear power plant generates steam, which is used to turn the turbine and generate electricity via an electric generator. The nuclear chain reaction’s energy is transformed to mechanical energy, which is then converted to electrical energy via an electric generator.
• At thermal power plants, electric generators are installed. Coal and petroleum are used here to heat water and create steam. This steam turns the turbine, which generates power. As a result, thermal energy derived from the combustion of fossil fuels is transferred into mechanical energy, which is then converted into electrical energy by an electric generator.

Conclusion

Generators are devices that can be used as alternative to the current supply. They’re also used in industries including road construction, mining, offshore drilling, outdoor shooting, and event management to meet power demands. Alternator is another name for it. It’s a method of generating electricity in a number of places. Nowadays, everyone uses air conditioning

Mechanical energy is converted into direct current electricity by a DC generator. This type of electric generator does not vary the direction or magnitude of the electricity it produces.

At geothermal power stations, an electric generator is installed to heat water using geothermal energy. As a result of the steam generated, the turbine turns, converting geothermal energy to mechanical energy and then to electrical energy.