No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
Direct-current (DC) machines are divided into dc generators and dc motors. Most DC machines are similar to AC machines: i.e. they have AC voltages and current within them. DC machines have DC outputs just because they have a …
Electromagnetic Conversion Energy is needed in different forms: Light bulbs and heater electrical energy Fans and rolling mills mechanical energy Electrical system Electric Machines Energy Flow Motor Mechanical system e, i T, n …
6. Commutator The commutator is mounted on the rotor of a dc machine. The commutator and brush arrangement works like a mechanical dual converter. In case of generator it rectifies the induced ac to dc. In case of motor it inverts the dc supply to ac. (In motor, the commutator reverses the current through the armature conductors to get unidirectional torque).
A DC machine is used to operate the devices which use unidirectional current. 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 ...
Whats is a DC Machine? Types of DC Marines, their Construction, Operation and Working Principle and Applications. Parts and Construction of DC Machine
DC Motor_PPT - Free download as PDF File (.pdf), Text File (.txt) or read online for free. The document discusses different types of DC motors and their applications. It explains that DC machines can operate as both motors and generators. It then describes the main parts of a DC motor including the brushes, commutator segments, rotor, and stator.
Some of the parts of the DC machine is discussed below. 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 materials used in the yoke are designed with cast iron, cast ...
Eee unit 3 dc machines ppts-- - Download as a PDF or view online for free. Submit Search. ... The other parts of a DC Generator are magnetic frame and yoke, pole core and pole shoes, field or exciting coils, armature core and windings, …
The same basic DC machine can be either a motor or a generator. Essential Components of a DC Machine. DC machine either uses or produces electrical energy. It does this by converting mechanical energy into electrical energy or vice versa. A DC machine is made out of two essential parts, one stationary and one moving, called the field and the ...
Losses in DC Generator. The input power is not fully transformed into the output power in a DC machine. Some part of input power gets wasted in various forms. In a DC machine, the losses are broadly classified into four types: Copper Loss Copper loss takes place when the current flows through the winding.
3. DC MACHINES 4.1. INTRODUCTION Dc machines are one part of electrical machines used for energy conversions systems. it is versatile and extensively used in industry. DC machines can work as generators and motors. I. DC Generator Converts mechanical energy to electrical energy diesel engine Turbine (steam) source of mechanical power (prime mover) …
Electrical dc machines - Download as a PDF or view online for free. ... It provides protection to the rotating and other parts of the machine from moisture, dust etc. • Yoke is an iron body which provides the path for flux • It provides the mechanical support for the poles. • Materials used for yoke are cast iron, silicon steel, cast ...
Electrical Machines Introduction A DC Machines can be used as either a DC generator or a DC motor. DC generators - To convert mechanical energy to electrical energy. - Limited use due …
3. Working of a DC Motor How it Works An elementary model is shown here in fig (a) to understand the working in easy way. • Invariably all dc motors consist of a set of magnetic poles (North and south) to create magnetic field shown in fig (b). •All dc motor consist of windings represented by a single loop in this model for simplicity fig (c).
DKT 123. DC Machine. Contents. Overview of Direct Current Machines Construction Principle of Operation Types of DC Machine Power Flow Diagram Speed Control. LEARNING OBJECTIVES. Upon completion of the chapter the student should be able to: Slideshow 4602507 by fayre
3/23/2007 ELEC A6 DC Machine 7 DC MACHINES Real DC machine Construction • Stator: Stationary part of the machine. The stator carries a field winding that is used to produce the required magnetic field by DC excitation. Often know as the field. • Rotor: The rotor is the rotating part of the machine. The rotor carries a
DC-machines (1).ppt - Download as a PDF or view online for free. DC-machines (1).ppt - Download as a PDF or view online for free ... Field system consists of the following parts Yoke Pole cores Pole shoes Field coils 22. Armature core The armature core is cylindrical High permeability silicon steel stampings Impregnated Lamination is to reduce ...
A device which is used in dc generator to convert alternating induced emf to unidirectional dc emf is called commutator. Construction of DC machines : A D. C. machine consists of two main parts 1. Stationary part: It is designed mainly for producing a magnetic flux. 2. Rotating part: It is called the armature, where mechanical energy is
Direct-current (DC) machines are divided into dc generators and dc motors. Most DC machines are similar to AC machines: i.e. they have AC voltages and current within them. DC machines …
An 8kW, 200-V dc generator has a full load current of 40nA at 1200rpm. Given the armature resistance is Ra=0.5Ω, armature is modeled as shown below, where RL is a resistive load. Determine the full load voltage for this generator at 900 rpm. DC Machines
There are some applications where large quantities of DC power are required, such as electroplating, electrolysis, etc. Hence, at such places, DC generators are used to deliver power. Basic Structure of Electrical Machines. The rotating electrical or DC machine has mainly two parts; one is Stator, and another one is Rotar. The stator and rotor ...
57. Applications of DC Motors • DC shunt motor are used where speed has to maintain nearly constant with load and where a high starting torque is not required. Thus shunt motors may be used for driving centrifugal pumps and light machine tools, wood working machines, lathe etc., • Series motors are used where the load is directly attached to the shaft …
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 …
Dc machines (Generator & Motor) - Download as a PDF or view online for free. Dc machines (Generator & Motor) - Download as a PDF or view online for free ... Field System consists of the following Parts: Yoke Pole cores Pole shoes Field coils 6/6/2017 By Mohammed Waris Senan 22 Field System 23.
Dc machines - Download as a PDF or view online for free. Submit Search. ... Wednesday, January 27, 2016 Ch. 14 Alternators and Synchronous Motors 7 Electrical Rotary Machine • It has two parts : (1) the fixed part, called …
CONSTRUCTION OF DC MACHINE UNIT-III BY S RATNA KUMAR. LAP WINDING . LAP WINDING AND WAVE WINDING . WINDING PROGRESSES,WINDING RETROGRESSES. EQUALIZER RINGS. USES OF LAP WINDING. ... voltage Vt is a part of E. But E is not equal to Vt while supplying a load. This is because when armature current la flows through armature …
The rotating electrical or DC machine has mainly two parts; one is Stator, and another one is Rotor. The stator and rotor are separated from each other by an air gap. The stator is the outer frame ...
DC Machines.ppt - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. This document discusses direct current (DC) motors and generators. It provides details on their construction and operating principles. The document first describes the basic components and construction of a DC motor, including its stator poles, …
Chapter 6 DC and AC Machines. Introduction . An electrical machine is link between an electrical system and a mechanical system. Conversion from mechanical to electrical: generator Conversion from electrical to mechanical: motor. Introduction . Machines are called
A DC Machines can be used as either a DC generator or a DC motor. Electrical Machines Introduction A DC Machines can be used as either a DC generator or a DC motor. DC generators - To convert mechanical energy to electrical energy. - Limited use due to solid state rectifier. DC motors - To convert electrical energy to mechanical energy - Widely used - Main feature: …
