DC Generators with Self-Excitation
Self-excited DC generators will have field magnets that are powered by the current supplied by themselves. In these devices, the field coils and armature are linked internally.
Because of residual magnetism, there is always flux at the poles. When the armature is pivoted, some EMF is generated. Thus, some induced current is generated. As the pole flux increases, so does the armature EMF, causing the current to flow faster through the field. This increased field current rises armature EMF.
Self-excited DC generators can be characterized as follows based on where the field coils are:
- Series Generators
- Shunt Generators
- Compound Generators
Construction And Working of a DC Generator
In 1831, Michael Faraday, a British physicist, devised the electromagnetic generator. The primary function of this device is to convert mechanical energy to electrical energy. There are several types of mechanical energy sources available, including hand cranks, internal combustion engines, water turbines, and gas and steam turbines. The generator provides capacity for all electrical power networks. An electric motor should be able to perform the generator’s converse function. The basic purpose of the motor is to convert electrical energy into mechanical energy. Generators and motors have many properties.
Table of Content
- DC Generator
- Construction of a DC generator
- Workings
- Types
- Losses in DC Machines
- Characteristics of DC Generator
- Characteristics of DC Series Generator
- Characteristics of DC Shunt Generators
- External Load Characteristics of the DC Compound Generator
- Efficiency of a DC Generator