Nowadays, a generator is an extremely important device in life and business production. In the context of increasing demand for electricity consumption, and the power supply not always being able to fully meet human usage needs, especially in cases of sudden power outages.
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What is a generator?
A generator is a device that converts mechanical energy into electrical energy using the principle of electromagnetic induction. The primary mechanical energy source can be steam turbines, water turbines, internal combustion engines, wind turbines, or other mechanical energy sources.
The first generator was called the Faraday disc, which was invented in 1831 by the British scientist Michael Faraday. After a long historical process, we now have generators that, despite their small size, can provide a large amount of electricity for households and production.
Structure and operating principle of generators
The power generator operates based on the following principle: Fuel → Mechanical energy → Electrical energy.
The generator produces electricity based on the law of electromagnetic induction and electromotive force. In a generator, the electric current and voltage are generated by the variation of the rotating magnetic field.
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Types of power generators and their applications in production and daily life
Each type of power generator has different advantages, depending on the purpose and needs for use to choose the most suitable type of generator. There are many different ways to classify, below are the three most common ways to classify power generators.
Based on the type of fuel used
Diesel engine generators Concept:
This type of generator uses diesel fuel. Unlike gasoline engines, diesel generators only need air, and then inject fuel into the compressed air. The heat of the compressed air naturally compresses the fuel. Features: Diesel generators typically have a high compression ratio, strong engines, and high power from 100KVA, 200KVA, 300KVA … 1000KVA. Applications: These types of generators are usually used in hotels, construction sites, or some production workshops.
Gasoline engine generators Concept:
This type of generator uses gasoline, a mixture of air and gas that is blended and then compressed… Features: This type of engine has a lower ignition temperature, but it is “easier to ignite.” The engine has a lower compression ratio than diesel and is usually designed for small power generators of 2KVA, 3KVA, 5KVA …
Applications: This type of generator is usually used in households or small shops with low power consumption needs.
Based on the phase of the electrical voltage output
Single-phase generator Concept:
This is a generator composed of rotating rotor and stationary stator parts. Features and Applications: This design is quite simple and is widely used in life, especially in manufacturing plants, companies, factories, …
Three-phase generator Concept:
This is a generator system consisting of 3 AC currents with the same amplitude and frequency, but with a phase shift of ⅔. In which, the 3 coils of the hardware are placed at ⅓ rotation on the stator.
Features: It has a quite flexible design, stable engine, noise reduction capability and fuel economy, …
Applications: It is an industrial generator with quite high power, mainly serving large projects such as constructing high-rise buildings, hospitals, schools, hydropower plants, factories, and workshops, …
Based on the type of output current:
AC generators Concept
AC generators produce alternating current that changes direction periodically. It is based on the principle of electromagnetic induction and is widely used in daily life.
Features and Applications:
AC generators are widely used in many areas of life, such as household electricity, factories, transportation systems, …
DC generators Concept
DC generators produce direct current that flows in one direction. It is based on the principle of electromagnetic induction and is used in specialized fields that require DC power.
Features and Applications:
DC generators are used in specialized fields such as electroplating, electric welding, electric locomotives, battery charging, and some other areas that require DC power.
3. Factors affecting the power and operation of a generator
For a generator, there are two important values to consider: rated power and available power.
The rated power is the power of the generator when it operates under normal conditions.
The available power is the maximum power that the generator can safely and continuously produce without violating other technical specifications. Typically, the available power is calculated under standard conditions.
However, in reality, the operating conditions of the equipment may not match the standard conditions. Therefore, the available power is usually lower than the rated power.
Factors affecting the available power of a generator include:
- The ambient temperature where the generator operates
- Changes in the cooling system of the generator
- The aging of insulating materials, which reduces the generator’s ability to withstand heat
- The electrical resistance generated during operation
- The compression pressure of the engine
- The limitations of the primary engine that drives the generator
- The limitations of the equipment installed behind the generator, such as circuit breakers, transformers, and power lines.
Therefore, when purchasing a generator, it is important to consider these factors in order to choose the generator with the most appropriate power to meet your electricity needs. It is best to choose products from well-known brands that are specifically manufactured for the Vietnamese market and are suitable for the environmental conditions, humidity, and climate of the country.
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How to choose the most efficient generator?
When investing in machinery and equipment, besides the cost, we are concerned about the technology foundation, durability, and stability during use.
All equipment will wear out after a period of use, but the extent of this depends on the brand of the machine.
Depending on the intended use and electricity consumption needs, it is important to choose a generator with the most suitable power capacity to ensure a stable power supply for daily life and production.
Different users will have different ways of choosing a generator. However, there are some general considerations that you should know when choosing a generator:
- Calculate the power consumption of all electrical appliances to estimate the power capacity of the generator needed.
- Choose a generator with a power capacity higher than the actual power consumption by 10% to 25% to increase the longevity and durability of the product.
- When selecting a generator, pay attention to choosing a product with clear warranty and origin information.
- Generators used in certain places such as elevators need to have precise technical specifications to choose the appropriate type of generator.
- Choose a generator with a long continuous operating time to ensure that daily life and production activities are not interrupted when there is a power outage.
- Choose a generator from well-known brands that have been tested for quality such as Denyo from Japan, Mitsubishi, etc.
Check out Denyo generators, a leading brand from Japan with a diverse power capacity ranging from 13KVA to 1100KVA to meet all customer needs from daily life to business production.
5. Where to buy a new/used generator?
Whether buying a used or new generator, choosing a reputable brand is always necessary. This ensures that the quality and reliability of the machine have been tested, and that it will remain stable during use so that customers do not suffer any losses.
For Japanese generator products, Denyo is a popular and highly regarded brand in the supply of generators.
U-MAC Vietnam is a 100% Japanese-owned company and is the exclusive representative of Denyo in Vietnam, distributing both used and new generator products with diverse capacities ranging from 13kVA, 25KVA, 45KVA, 60KVA to 1100kVA, serving factories, hotels, offices, warehouses, boats, the military, and households.
When purchasing a Denyo generator product at U-MAC, customers can rest assured about the quality of the product as well as the after-sales service, maintenance, and support.
Buy used Japanese Denyo and Nippon Sharyo generators that are as good as new, operate stably, and are regularly maintained.