Characteristics of DC Series Generator
A DC series generator has a single current that travels across the whole unit. As a result, the armature, load, and excitation currents are all the same.
Open circuit characteristics (O.C.C)
The curve (1) in the plot depicts the O.C.C of a series DC generator. The graphic depicts the relationship between the produced EMF at no-load and field current. The O.C.C. is acquired by isolating the field winding from the machine and excited independently.
Internal Characteristics
The internal properties of a DC series generator are represented by a chart plotting the generated EMF (E) on-load against the armature current. As a result of the armature response, the magnetic flux on-load will differ from the transition at no-heap. As a result, the manufactured EMF (E) under loaded conditions will be smaller than the EMF produced (E0) with no load. The internal characteristics curve is thus placed directly below the open circuit characteristics [refer to curve (2)].
External characteristics
The plot of the load current (IL) against the terminal voltage (V) is referred to as the external characteristics or load characteristics. Because the terminal voltage is not less than the produced voltage due to armature and series field copper losses, which are provided by,
V = E-Ia (Ra + Rse)
As a result, the exterior characteristics curve will be lower than the internal characteristics curve by an amount equal to the voltage drop caused by copper losses in the machine [see curve (3)].
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