All categories
Featured selections
Trade Assurance
Buyer Central
Help Center
Get the app
Become a supplier
(1376 products available)
Ready to Ship
Dynamic machines can be grouped into various categories based on energy source, rotor construction, application uses, or excitation method. These are the common types of asynchronous generators:
Induction generators
This type does not have any separate field excitation system like most other electrical generators; instead, it exploits the magnetic fields present in the rotor which are created by the winding structures. It uses a squirrel cage or wound rotor construction. This generator has a robust design with mass utilization and is widely found in wind energy systems. The self-gaming features of the induction generator promote the usage of existing motors as generators in industries.
Double-fed asynchronous generators
The main and auxiliary rotors on this synchronous machine are both fed electrically via windings on the rotors. The stator is connected to the grid. The advantage of this construction is that only part of the generated electrical energy has to be switched to the grid. This can be manipulated using the rotor that helps keep the generator operational even when the grid conditions fluctuate. These machines are widely used in wind power systems and are designed in a manner that allows electrical engineers to easily control them.
Permanent magnet asynchronous generators
These generators utilize permanent magnets fixed on the rotor, thus forming the magnetic field structure. Due to these, no auxiliary power supply units are necessary to be introduced on the system. This feature increases the generator's operational efficiency and makes it a preferred option for those looking for low-cost maintenance work. Because of their compactness, these machines can easily be installed in small spaces.
Excitation-controlled asynchronous generators
These are conventional synchronous machines in which the field excitation is applied to the rotor in a controlled manner. The main windings are connected to the grid, while the excitation windings collect induced voltage, which is used to obtain the desired excitation value. This operation allows the generator to regulate output and maintain stability to power systems. These generators are widely used in large power plants. Generators with excitation control also help and provide reactive power that is essential for overall voltage regulation.
Electricity production
The main use of asynchronous generators is to generate electricity. Asynchronous generators convert mechanical energy into electrical output. Asynchronous generators are commonly used in industries to act as a secondary energy source. Wind power systems running on asychronous generators produce over 5 megawatt of power that can be use even in large grids.
Standby power systems and uninterruptible power systems
Asynchronous generators are used in standalone power units, uninterruptible power systems, and standby generation units. Such systems are integrated into an asynchronous generator, which acts as a compensating source in the voltage and frequency parameters of the primary electrical grid fluctuations. These generators produce electrical energy that can be used when the main source fails to provide operational continuity.
Excitation systems in low-powered grids
In low-powered electrical grids, asynchronous generators are used as excitation sources. These generators act as compensators for voltage parameters, thus improving voltage stability. They also inject reactive power, which is very important in grids with local capacitive or inductive imbalance.
Power system synthesis
As per Reports, asynchronous generators can be utilized to synthesize electrical power systems. By using these generators, it is possible to improve and diversify the parameters such as voltage, frequency, and phase. This will increase their interconnection and widen their operational areas.
Compensation for electrical power system parameters
Asynchronous generators were found in electrical grids as compensating sources. They were used when there was an excess of Voltage active power or when voltage raised the current in the system. AGs once powered with mechanical energy, such as shaft horsepower, could offset voltage and driven frequency. An AG integrated into an electrical grid could help improve voltage parameters and smooth electrical oscillations.
Induction heating and melting
Asynchronous generators provide high-frequency electrical energy employed in induction heating and melting. Due to the frequency, it offers a high rate of heat generation on conductive materials. This enables rapid heating in industrial applications, such as in metallurgy or manufacturing processes.
Mechanical and electrical parameters
When choosing an asynchronous generator, one should have information on its operating speed range and its peak value, the active and reactive power it must deliver, and the voltage and frequency inclusive of the range. Notice the mechanical parameters, for instance, the type and size of the mechanical actuator connected to the generator.
Grid structure
One must understand the overall electrical network structure and the types of primary electrical sources connected to the network. Determine whether the generator will be connected to a parallel electric grid and describe how it is electrically organized. Knowing these can help one choose a generator with operational characteristics compatible with those of the electrical network.
Operating condition
When selecting the external factors, one should pay attention to the respective ambient conditions that can affect the generator's operational reliability. These factors include humidity, dust and possibility of contamination, temperature range, and operating conditions of mechanical actuators. Also, consider how these generators will be used. Assess the load characteristics and determine whether the generator will be used for continuous or peak demand.
Cost and reliability
Asynchronous generators selection involves troublesome operational and initial costs versus reliability. Great efficiency generators save large amounts of electrical energy but are highly expensive. Less efficient generators have lower purchase prices, which in the long term cost much because of the high energy prices. So in this aspect, one will have to consider the budget, if one has a high budget for the purchase of the generator, he should focus on buying an energy-efficient generator that works for a longer time.
Certificates and standards
All the electrical devices should comply with the regulations and standards applicable to their country or region. These include the safety, emission, and electromagnetic compatibility standards. Manufacturers and suppliers certificates often give generator quality and reliability information.
Maintenance of mechanical components of asynchronous generators
Mechanical wear occurs because of motion in different mechanical components such as rotor, bearings, shafts, and more. So, routine washing and change of lubricant will help eliminate the mechanical wear. Monitoring of vibration and other parameters will aid in determining possible mechanical faults in the shortest time possible. Mechanical components like generators may need the usual mechanical components like bearings, bushings, and belts. Mechanical and structural components wear out and must be replaced over time. This requires a thorough examination of the component so only the mechanical parts with the maximum wear should be replaced. Asynchronous generators should also be installed with mechanical covers so that dust and other contaminants don't cause mechanical or structural damage.
Maintenance of electrical components of asynchronous generators
Electrical components wear like pens, slip rings, field windings, or stator and collect much dirt and dust. This can cause poor electrical contact or insulation breakdown, which can cause the device to stop working. Cleaning the electrical parts can make the generator parts last longer. Insulation resistance measurements and practicing techniques like meggering on windings help find and fix electrical faults. Electrical components like capacitors, resistors, or electronic parts will deteriorate over time. These components need to be regularly checked for electrical parts failure and replaced as necessary.
Maintenance of governor and voltage regulator
Varying and irregular frequency and voltage parameters affect electrical generators' output power. It is, therefore, vital that a voltage regulator is regularly monitored, adjusted, repaired, and changed, where necessary, to ensure the voltage parameters are stable. Regular maintenance allows the governor to adjust the engine output as required depending on load conditions. A governor and voltage regulator maintenance program allows the generator to provide stable and reliable electrical output.
Maintenance of the exciter control system
Synchronous generators need constant field excitation, and Exciter control systems must be carefully maintained. It is usually a maintenance routine to ensure the system parameters are optimal to avoid under excitation or over-excitation, which can cause system instability. Checking electronic components and power supply units and cleaning them can help with good generation.
A1: An asynchronous generator converts mechanical energy into electrical output. These generators are commonly used in industries to act as a secondary energy source. Wind power systems running on asynchronous generators produce over 5 megawatts of power that can even be used in large grids.
A2: Asynchronous generators are used in standalone power units and uninterruptible power systems, voltage parameters, and standby generation units while keeping the electrical grid operationally continuous. They inject electrical energy when the main source fails to provide operational continuity and a compensating source.
A3: Asynchronous generators have to be kept in a well-ventilated area and away from direct sunlight so that the internal part of the generator does not get too hot and is destroyed. These generators shouldn't be placed in an enclosed space or around flammable materials, as they produce fumes.
A4: To repair generators that are not working, the first thing to do is check the internal cooling fan to ensure nothing is blocking it. If the cooling fan is blocked, then remove the obstruction, then return the generator. Lastly, even after carrying all these maintenance activities, the generator should be taken to experts so that they check it out properly and it starts working again.
