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Also known as single-phase alternators, single-phase generators produce a single, continuous alternating voltage. These generators are commonly used to generate power in single-phase electrical power systems; however, polyphase generators are typically used to deliver power in a three-phase distribution system, with the current converted to single-phase near the single-phase loads alternatively.
For this reason, single-phase generators are found in a variety of applications which are most often used when loads that are driven are light and not connected to a three-phase distribution.
There are two designs where single-phase generators are concerned namely revolving armature and revolving field.
These generators have an armature part on a rotor with the magnetic field part placed on a stator. There is a basic design, referred to as an elementary generator, which involves a rectangular loop armature to cut the lines of force between the north and the south pole.
When this is cut through rotation, an electric current is produced. The current is subsequently sent out of the generator unit through two sets of slip rings as well as brushes, with one of each used for each end of the armature.
Thus, in this design, the armature rotates one revolution which generates one cycle of single-phase alternating current (AC) and to generate AC output, the armature is rotated at a consistent speed so that the number of rotations per second match the desired frequency, in hertz, of the AC output.
This design involves having the armature part on a stator and the magnetic field part on a rotor. The basic design involved with revolving field single-phase generators involves two magnetic poles, north and south, which are attached to a rotor with two coils connected in a series, equally spaced on the stator.
The windings of these coils are in reverse direction resulting in the current flowing in the same direction as result of the coils’ interaction with opposing polarities. Since the poles and coils are equally space, and the locations of the poles match the locations of the coils, the result is that the magnetic lines of force are cut at the same amount at any degree or the rotor.
Due to this, the voltages induced to all windings will have the same value at any given moment. Subsequently, the voltages from both coils are ‘in phase’ to one another. Thus, the output voltage is twice the voltage induced in each winding.
Single-phase generators are typically used for residential purposes that only require power to run small appliances and devices. It is one of the perfect generators to use in rural areas with small equipment being run well without requiring constant high power.
Both these generators provide power in separate ways even though the type of power they provide is the same. Single-phase generators produce a single voltage which alternates continuously.
Due to the power being generated in a single wave, the level will vary throughout its cycle. These varying waves cause the power level to drop throughout the process. However, such drops typically go undetected to the eye and the year in normal, residential, and other small operations.
Three-phase generators work by producing three separate AC power waves which operate in a sequence. This ensures that there is a continuous flow of energy and that, in addition, the power level will not drop, as it does with single-phase generators. Due to this uninterrupted reliability, three-phase generators are more powerful and used in larger operations.
Africa Power Equipment offers an impressive range of Single-Phase Generators for sale that span across different manufacturers, models, and engine types, with the most popular generators including, but not limited to:
Most cost-effective single-phase generators provided by Africa Power Equipment:
The first step in selecting the right generator involves a checklist of the devices, equipment, and machinery that will need to be run by the generator.
It is imperative to consider the amount of electricity that each uses and to add this up to get the required wattage. Consider the distinct types of generators that are available, namely:
It is important to consider the fuel type that the generator uses, and how much it will cost to keep the generator running, depending on the usage for the generator, whether as standby or back-up power, or consistent use.
It is also crucial to consider whether the generator must be moved around or whether it will be stationary. The building material and durability of the generator must be considered, especially if it will be located outside. The cost of maintaining the generator is another important consideration.