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Direct current machines are energy transfer devices. These machines can function as either a motor or a generator. DC motors and generators have the same basic construction, differing primarily in the energy conversion. To better understand the operation and construction of DC machines, a few basic terms must be understood. Components of a DC ...
Construction of DC machines- The D.C. generators and D.C. motors have the same general construction. Any d.c. generators can be run as d.c. motor and ...
DC Machine Construction, Working Its Applications. ... When we evaluate with DC machines, Alternating Current machines have more advantages because of the losses that appear in DC. Though the losses are more, DC machines find its importance in modern day to day life. It has its unique feature of generating unidirectional current.
Construction Of A Dc Machine And Working Of Dc Motor As stated earlier, whether a machine is d.c. generator or a motor the construction basically remains the same as shown in the Fig. 1. Fig.1 A cross section of typical d.c. machine
2020-6-15Each DC machine can act as a generator or a motor. Hence, this classification is valid for both DC generators and DC motors. DC machines are usually classified on the basis of their field excitation method. This makes two broad categories of dc machines
Construction of Dc motor. Construction of Dc motor nearly looks like the construction of Dc generator, originally when the Dc machine starts working we cant identify whether its a Dc generator or motor, briefly Dc motor consists of. Stator its the stationary part containing the field winding and receives the supply. Rotor which is the rotating part.
2010-9-4Basic Principles and Functions of Electrical Machines O.I. Okoro, Ph.D.1, M.U. Agu, Ph.D.1, and E. Chinkuni, ... BASIC FEATURES OF ELECTRIC MACHINES The basic structural features of a D.C. machine are ... Rotor Construction - The rotor of A.C. machines can be of wound type or squirrel cage type. A typical squirrel cage rotor is
Now we will recognize in detail construction of Dc generator. We will deal with a 4 pole Dc generator. and we had explained that it consists of a stator and a rotor. The stator of Dc generator Its the main fixed part of the generator, the stator responsible for supplying the magnetic fields during coil rotation, and it mainly consists of
2020-6-19The very basic construction of a DC motor contains a current carrying armature, connected to the supply end through commutator segments and brushes. The armature is placed in between north pole and south pole of a permanent or an electromagnet as shown in the diagram above. As soon as we supply direct current in the armature, a mechanical force acts on it due to the electromagnetic effect of ...
7.1 Introduction and Principle of Working. DC machines work either as a dc generator or as a dc motor. In a dc generator, a set of conductors or coils placed on a rotating body, called armature, are rotated continuously inside a magnetic field with the help of a prime mover prime mover is another machine, may be a diesel engine or a turbine, which rotates the armature.
Commutation in DC Machines. The Commutation is the process of changing the form of alternating voltage or current to the single directional voltage or current and vice-versa. It consists of some segments which play a crucial role in this conversion process. The commutator segments are mainly used in the DC machines. It is made of Mica that acts ...
2020-5-23Although some DC machines have a permanent-magnet field, the overwhelming majority use coils to create the field. Figure 5 is a sketch of the construction of a DC machine. The field coils are placed behind the pole-faces, as shown, and the rotor contains the armature coils, although only one coil is shown in Figure 4.
Due to specific construction of DC machines and the presence of mechanical commutator, which directs the electrical current into rotor conductors, direction of the current in conductors below the north magnetic pole N does not change. It remains the same despite the fact that the rotor revolves.
Synchronous Machine Synchronous Machine constitutes of both synchronous motors as well as synchronous generators. An AC system has some advantages over DC system. Therefore, the AC system is exclusively used for generation, transmission and distribution of electric power.
The DC type machines are normally used in small applications whereas the AC type has its importance in a wide range of applications. Because the AC machines have more advantages compared to that of DC machines. In this article, we shall discuss what is AC motor, construction, working principle, types, speed control, and applications. AC Motor
2020-6-20Basic construction of 3-phase AC induction motors you should know photo credit capolight.wordpress.com The applications for these motors cover almost every stage of manufacturing and processing. Applications also extend to commercial buildings and the domestic environment.
There is no basic difference in the construction of a DC generator and a DC motor.. In fact, the same DC machine can be used interchangeably as a generator or as a motor. Like generators, there are different types of DC motors which are also classified into shunt-wound, series-wound and compound-wound dc motors.. DC motors are seldom used in ordinary applications because all electric supply ...
2 Book Summary. Electric Machines By DP Kothari and IJ Nagrath now in its 5 edition, is intended for third and fourth year UG students and first-year PG students of electrical engineering-updated with latest scientific advancements. The changes are made keeping the original flavor of the book intact, that is, in-depth coverage of fundamental concepts.
Construction of DC Machine Short Answer type Question and Answer 25 Short answer question and highlight point on construction of DC machines Q.1 On what principle does the generator operate Ans.
1.CONSTRUCTION OF DC MACHINES. A DC Machine is the an electro-mechanical energy conversion device.A DC machine consists of two basic parts stator and rotor.The below figure shows the basic co view the full answer
Q19. Explain the basic construction of DC machines. Q20. Explain the basic operating principle of DC generators. Q21. In a DC machine, if the armature winding is replaced by permanent magnets, can the machine still work Give your explanation. Q22. In a DC machine, if the field winding is replaced by permanent magnets, can the machine still work
2020-5-5Direct current machines are energy transfer devices. These machines can function as either a motor or a generator. DC motors and generators have the same basic construction, differing primarily in...
2020-6-16DC Aint Dead Yet. This two day course will cover DC machine theory and operation, as well as repair tips. Topics will include testing, data analysis and motor theory. Discussions will cover basic materials, loading and stresses, the most common failure modes and recommendations for repair practices for DC applications. Upon completion of this course, participant should be
2017-10-27Synchronous Machines Construction principle of operation of Synchronous generator and motor. EMF equation, Voltage regulation, Applications and starting of Synchronous motor. Introduction to single-phase induction Motor. MODULE-IV 10 HOURS Measuring Instruments DC PMMC instruments, Extension of range by shunts and multipliers.
2013-7-17DC Motors Although ac motors are used in most of the cases, DC motors have many applications and used for multi-purpose applications. DC Motor Principle A machine that converts dc power into mechanical energy is known as dc motor. Its operation is based on the principle that when a current carrying conductor is placed in a
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