Shunt DC Generators
In these types of DC generators, the field windings are linked in parallel with the armature conductors, as indicated in the picture below. In shunt generators, the voltage in the field winding is identical to the voltage across the terminal.
Here:
- Rsh = Shunt winding resistance.
- Ish = current flowing through the shunt field.
- Ra = Armature resistance.
- Ia = armature current.
- IL = Load Current
- V = terminal voltage.
- Eg = generated EMF.
Here, the armature current Ia is divided into two sections: the shunt field current Ish and the load current IL.
So,
Ia = Ish + IL
When IL is at its maximum, the effective power throughout the load is at its peak. In this approach, it is necessary to keep the shunt field current as low as feasible. To get the optimal EMF, the shunt field winding resistance is often kept high (100 Ω) with a large number of turns.
The shunt field current is equal to
Ish = V/Rsh.
Voltage across the load equals
V = Eg – Ia Ra.
The power generated is equivalent to:
Pg = Eg x Ia.
The power given to the load is equal to:
PL = V x IL.
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