Working Principle of Alternator
The machine which produces 3 phase power from mechanical power is called an alternator or synchronous generator. The working of an alternator is based on the principle that when the flux
DC Generator
A dc generator is an electrical machine which converts mechanical energy into direct current electricity. This energy conversion is based on the principle of production of dynamically induced emf. Learn everything related to dc generator from this page.
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Voltage and Power Equations of DC Motor | Condition of Maximum Power
In this post, we will look at the voltage and power equation of a dc motor and the condition for maximum power in a dc motor. Voltage Equation of a
Types of DC Generator – Series, Shunt and Compound
Please go through the construction of dc generator before reading this article about different types of dc generator. A DC generator requires MMF to establish flux in its magnetic circuit.
Testing of DC Machines (DC Motor and DC Generator)
There are several tests that are conducted for testing a dc machine (generator or motor) to judge its performance. The most important performance tests to be conducted on the dc
Swinburne’s Test of DC Machine (Generator and Motor)
Swinburne’s test is the simplest indirect method of testing dc machines. In this method, the dc machine (generator or motor) is run as a motor at no-load and losses of
Steam Power Stations – Arrangement and Working
Steam power stations convert the heat energy of coal combustion into electrical energy. A steam power station basically works on the Rankine cycle. Steam is produced in the boiler by utilizing
Speed Control of DC Motor (Shunt, Series and Compound)
Speed control of dc motor is achieved using different methods. There are three types of dc motors. For each of them, there are different methods of speed control. Each of
Parallel Operation of DC Series Generator
The interesting thing about the parallel operation of the DC series generator is that DC series generators are not usually employed for the supply of power. Instead, DC series motors
Losses in DC Machine ( DC Generator and Motor )
The losses in a dc machine (generator or motor) may be divided into three classes viz Copper losses Iron or core losses and Mechanical losses. All these losses appear as heat
Insulation Resistance Test (IR Test) or Megger Test
Insulation Resistance or IR Test is carried out by maintenance engineers to ensure the healthiness of the overall insulation system of electrical equipment. It reflects the presence or absence of
Electric Potential, Potential Difference and EMF
In this article, you will study what are electric potential, the potential difference (PD) and electromotive force (emf) and the difference between them. Just as a body raised above the
Electric Motor Maintenance : Preventive, Predictive and Reactive Maintenance
Electric Motors need maintenance regularly in order to avoid failure and prolong their lifespan. Generally, motors and motor parts should be maintained and tested at least every 6 months. Then
DC Generator Characteristics
DC generator characteristics are the relations between excitation, terminal voltage and load exhibited graphically by means of curves. These characteristics of dc generators are very important in the design and operation of dc generators. This article describes the
Construction of DC Machine (Generator & Motor)
The dc generators and dc motors have the same general construction. In fact, when the machine is being assembled, the workmen usually do not know whether it is a dc
Compensating Windings and Interpoles in DC Machines
Compensating Windings and Interpoles are one of the important step taken to minimize the undesirable effect of armature reaction in dc machines. Armature reaction causes many undesirable effects on a
Characteristics of Series Wound DC Generators
In this post, you will learn the characteristics of a series wound dc generator. This article is the continuation of the dc generator characteristics. The connection diagram of a series-wound
Characteristics of Separately Excited DC Generators
In a separately excited dc generator, the field coils are energized from an independent source. The disadvantage of a separately excited DC generator is the same that we require an external
Characteristics of DC Shunt Generator
In this article, you will learn the characteristics of a dc shunt generator. A shunt generator is a type of dc generator in which the field winding is connected in
Characteristics of DC Compound Generator
In a compound generator, both series and shunt excitation are combined as shown in the figure. The characteristics of DC compound generator is different for series and shunt generator characteristics.
Back EMF and Its Significance in DC Motor
What is Back EMF? When the armature of a DC motor rotates under the influence of the driving torque, the armature conductors move through the magnetic field and hence emf is induced
Armature Reaction in DC Generator
To understand the concept of armature reaction in DC generator, please go through the previous articles describing the construction of a DC generator. The concept of armature reaction is well explained
Armature Reaction in Alternator
Armature reaction in alternator is the effect of armature flux on the field flux (i. e., rotor ampere-turns). Read this article to learn more. We have already discussed the effect
Amplidyne – Working and Application
An amplidyne is an electromechanical amplifier with the characteristics of a rotating machine. It was invented prior to the second world war by Ernst Alexanderson. An amplidyne is a special-purpose
Advantages of Operating DC Generators in Parallel
In a DC power plant, power is usually supplied from several generators of small ratings connected in parallel instead of from one large generator. This is due to the following
5 DC Generator Problems with Solution – Part 1
1. A shunt generator delivers 450 A at 230 V and the resistance of the shunt field and armature are 50 Ω and 0.03 Ω respectively. Calculate the generated e.m.f?