The classification of generators includes:
Generators are divided into: DC generators and alternating current generators; AC generators are divided into: synchronous generators and asynchronous generators (rarely used); AC generators are divided into: Generators can also be divided into single-phase generators and three-phase generators.
There are many types of generators. In principle, they are divided into synchronous generators, asynchronous generators, single-phase generators, and three-phase generators.
In terms of production methods, they are divided into steam turbine generators, hydraulic generators, diesel generators, gasoline generators, etc. In terms of energy, it is divided into thermal generators, hydraulic generators, etc.
Extended information:
Characteristics of generator:
1. Working characteristics:
The performance of synchronous generators is mainly characterized by no-load characteristics and load operating characteristics. These characteristics are an important basis for users to choose generators.
2. No-load characteristics:
When the generator is not connected to a load, the armature current is zero, which is called no-load operation. At this time, the three-phase winding of the motor stator only has the no-load electromotive force E0 (three-phase symmetry) induced by the excitation current If, and its size increases with the increase of If. However, due to the saturation phenomenon in the motor magnetic circuit core, the two are not proportional. The curve reflecting the relationship between the no-load electromotive force E0 and the excitation current If is called the no-load characteristic of the synchronous generator.
3. Armature reaction:
When the generator is connected to a symmetrical load, the three-phase current in the armature winding will produce another rotating magnetic field, which is called the armature reaction magnetic field. Its speed is exactly equal to the speed of the rotor, and the two rotate synchronously.
Both the armature reaction magnetic field and the rotor excitation magnetic field of the synchronous generator can be approximately considered to be distributed according to the sinusoidal law. The spatial phase difference between them depends on the time phase difference between the no-load electromotive force E0 and the armature current I. The armature reaction magnetic field is also related to the load condition.
When the load of the generator is inductive, the armature reaction magnetic field acts as a demagnetizer, which will cause the voltage of the generator to decrease; when the load is capacitive, the armature reaction magnetic field acts as a magnetizer. This will increase the output voltage of the generator.
Baidu Encyclopedia-Generator