3. THEORY DC MOTOR The DC motor has two basic parts: the rotating part that is called the armature and the stationary part that includes coils of wire called the field coils. The stationary part is also called the stator. Figure 12-1 shows a picture of a typical DC motor, Fig. 12-2 shows a picture of a DC armature, and Fig. 12-3 shows a picture of a typical stator.
Key learnings: DC Motor Definition: A DC motor is defined as a device that converts direct current electrical energy into mechanical energy.; Stator and Rotor: The stator is the stationary part with field windings, and the …
Our 1000+ DC Machines MCQs (Multiple Choice Questions and Answers) focuses on all chapters of DC Machines covering 100+ topics. You should practice these MCQs for 1 hour daily for 2-3 months. This way of systematic learning will prepare you easily for DC Machines exams, contests, online tests, quizzes, MCQ-tests, viva-voce, interviews, and ...
In case when the dc machine fails to build up the voltage due to lack of residual magnetism, filed coils are connected to the dc source (battery) for short while for magnetizing the filed poles. Application of external source of direct current to the field of …
So, these machines are used at a place where there is a requirement of single directional power. These machines are used in batteries to generate unidirectional power. This article gives an overview of a DC …
The purpose of the rotor is to provide the rotating element in a DC machine (refer to Figure 2). In a DC generator, the rotor is the component that is rotated by an external force. In a DC motor, the rotor is the component that turns a piece of …
Construction of DC Machine Yoke. Another name of a yoke is the frame. The main function of the yoke in the machine is to offer mechanical support intended for poles and protects the entire machine from moisture, dust, etc. The …
In relation to DC machines, match the following and choose the correct combination. Group-I(Performance variables) (P) Armature emf (E) (Q) Developed... View Question GATE EE 2004. The armature resistance of a permanent magnet dc motor is 0.8 $$Omega$$. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at ...
The main parts of DC Machine (motor or generator) are as follows: Yoke; Pole core and pole shoes; Pole coil and field coil; Armature core; Armature winding or conductor; Commutator; Brushes and bearings
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The construction of a DC machine involves several critical components that allow it to function efficiently. Here's a breakdown of its main parts: Yoke: The yoke, also known as the frame, is …
On large DC machines, the pole-face is typically bolted on to allow easier installation and replacement of the field coil. Figure 8 Stator (field) lamination of a DC machine. Figure 9 shows a cutaway view of a wound- field DC machine. The field coil at the front of the machine has been cut and the ends of the coil can be seen surrounding the pole.
Explore the virtual lab for constructing DC circuits with interactive simulations and intuitive controls.
Although 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 …
Learn about the unique features of stator and rotor, and how they enable DC machines to function as generators and motors. ← Recent Show all results for "" My Library Library Go to Features Feature Overview Ace your exams with our all-in-one platform for creating and sharing quizzes and tests. ...
A Yoke. Poles. Field windings. Armature windings. Commutator. Brushes. A stator is the static part of the DC machine that houses the field windings and receives the supply. A rotor is the rotating part of the DC …
The voltage generated in the armature winding of a DC generator is alternating because it is placed in a rotating magnetic field. Commutation in a DC machine, especially in a DC generator, is the process that converts this alternating current into direct current using the commutator and stationary brushes. In a DC Motor, the input direct current (DC) is converted …
DKT 213 CHAPTER 4 Introduction to DC Machine. Contents • Overview of Direct Current Machines • Construction • Principle of Operation • Types of DC Machine • Power Flow Diagram • Speed Control. LEARNING …
A DC machine is an electromechanical device that is used to convert electrical energy into mechanical energy or vice versa. The DC machine used to convert electrical energy into mechanical energy, which is known as DC motor and the DC machine used to convert mechanical energy into …
DC Machine - Construction, Working, Types, EMF Equation & Applications - Free download as PDF File (.pdf), Text File (.txt) or view presentation slides online.
Construction of DC Machine - Free download as Word Doc (.doc / .docx), PDF File (.pdf), Text File (.txt) or read online for free. All DC machines have five main components: a magnetic frame, pole cores and shoes, field coils, an armature core, armature winding, commutator, and brushes/bearings. The magnetic frame provides mechanical support and carries magnetic flux.
DC Machine: Construction and their Applications The DC machine can be classified into two types namely DC motors as well as DC generators. Most of the DC machines are equivalent to AC machines because they include AC currents as well as AC voltages in them. The output of the DC machine is DC output because they convert AC voltage to DC voltage.
DC Waveform. The ripple in the DC waveform can also be improved by adding more poles. More poles also provide a stronger field, and therefore a higher induced voltage. DC Generator with 4 Poles DC Generator Construction …
Construction of DC Machine (Part-1) Lesson 3 of 14 • 16 upvotes • 10:08mins. Yatin Gupta. In this lecture we will cover the construction part of the DC machine this lecture will have following topics 1. Relation between electrical and mechanical degree 2. Yoke, Armature core, poles, brushes, Commutator.
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Experiment with an electronics kit! Build circuits with batteries, resistors, ideal and non-Ohmic light bulbs, fuses, and switches. Determine if everyday objects are conductors or insulators, and take measurements with an ammeter and voltmeter. View the circuit as a schematic diagram, or switch to a lifelike view.
The armature winding of a dc machine is a closed-circuit winding; the conductors being connected in a symmetrical manner forming a closed-loop or series of closed loops. Depending upon the manner in which the armature conductors are connected to the commutator segments, there are two types of the armature winding in a DC machine viz., ...
Learn about DC machines, their basic structure, types, armature equivalent circuits, applications, power flow diagram, and advantages in this detailed article.
Each DC machine contains two separate terminals with a magnetized center between them. There are two main parts, the stator and the rotor. The stator contains parts such as brushes, magnets and housing for the …
This document provides an overview of DC machines including generators and motors. It discusses the working principles, construction details, types of DC motors including shunt, series and compound motors. It covers key concepts such as EMF equation, back EMF, torque equation and characteristics of DC motors.
Explanation: Brushes in a DC machine are normally placed electrically in the interpolar regions and therefore make an angle of 900 electrical with the axes of adjoining filed poles. 5. In a DC machine, rectification process is carried out in order to get unidirectional output (DC). This rectification process is carried out by _____
List Of DC Machine Interview Questions Q: What are the essential parts of DC machine? 1. Magnetic frame or yoke 2. Poles 3. Armature 4. Commutator 5. pole shoes 6. armature windings 7. interpoles 8. Brushes 9. bearings 10. shaft Q. What is the purpose of yoke in d.c machine? 1.It acts as a protecting ...
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Construction of DC machines. 1.) Yoke. The outer frame of a dc machine is called a yoke. It is made up of cast iron or steel. It not only provides mechanical strength to the whole assembly but also carries the magnetic flux …
