A DC Machine is an electro-mechanical energy conversion device. There are two types of DC machines; one is the DC generator, and another one is known as DC motor. A DC generator converts mechanical power (ωT) into DC electrical power (EI), whereas, a DC motor converts d.c electrical power into mechanical power.

The main function of the yoke is to provide protection for whole machine. The yoke is a stationary and outer cylindrical part of DC machines. The cheapness is main consideration therefore yoke is made up of cast iron in the small DC machines but it is made up …

DC motor, how it works? A Direct Current (DC) motor is a motor that turns energy from a direct current and turns this into mechanical energy. The first DC motor was developed around the 1830's-1840s. They were commercially unsuccessful, because these motors were battry powered and batteries were still very expensive and the quality was low.

The simplest type of winding construction used in modern DC machines is the simplex lap winding. A simplex lap winding is a rotor (armature) winding consisting of coils containing one or more turns of wire with the two end of each coil coming out at adjacent commutator

DC Machine Construction, Armature Reaction & Commutation (C) to decrease the speed of rotation (D) to increase the length of the armature Q.10 An e.m.f. is induced in the windings of an armature of a DC generator when the armature rotates in ______ [SSC JE Electrical 2 March 2017 2.45 pm] (A) alternating magnetic flux (B) magnetic field (C ...

The principle of single loop DC generator has been described for the basic understanding of DC generator working. Now we will discuss the construction and working of actual generator. The construction of DC generator and DC motor is same therefore instead of DC generator let say DC machine which is more appropriate and cover all aspect of DC motor and DC generator construction.

DC Machines Construction The stator of the dc motor has poles, which are excited by dc current to produce magnetic fields. In the neutral zone, in the middle between the poles, commutating poles are placed to reduce sparking of the commutator. The commutating poles are supplied by dc current. Compensating windings are

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 machine that brings about the mechanical rotations. All these parts put together make up the total construction of a DC motor.

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. This article outlines basic construction and working of …

Figure 9: EMF Curve of Simple DC Generator. A pulsating direct current such as given by a signal coil generator is not suitable for most commercial purposes. However, by employing a large number of coils and commutator segments, with the coils evenly distributed around the surface of the armature the brush voltage may be made practically consist.

Construction of synchronous machines Two common approaches are used to supply a DC current to the field circuits on the rotating rotor: 1. Supply the DC power from an external DC source to the rotor by means of slip rings and brushes; 2. Supply the DC power from a special DC power source mounted directly on the shaft of the machine.

The principle of single loop DC generator has been described for the basic understanding of DC generator working. Now we will discuss the construction and working of actual generator. The construction of DC generator and DC motor is same therefore …

electric motor - electric motor - Construction of induction motors: The stator frame consists of laminations of silicon steel, usually with a thickness of about 0.5 millimetre. Lamination is necessary since a voltage is induced along the axial length of the steel as well as in the stator conductors. The laminations are insulated from each other usually by a varnish layer.

Washington, DC: Association for Professionals in Infection Control and Epidemiology, Inc., 2000:76.1--76.8. Weems JJ Jr, Davis BJ, Tablan OC, Kaufman L, Martone WJ. Construction activity: an independent risk factor for invasive aspergillosis and zygomycosis in patients with hematologic malignancy. Infect Control 1987;8:71--5.

Construction of DC Machines. In the structure of DC machine either dc motor or generator, there are 2 main parts first one is the static or the second one is …

Construction of DC Machine. The DC machine consists of Yoke, Pole, and Pole shoe, Armature core, Field Winding, Armature Winding, Commutator, Brushes, shaft, and …

CONSTRUCTION OF DC MOTOR. All DC machines mainly consist of two parts. One is the stator and the other is Rotor. The stator is a stationary part that includes yoke, pole, pole winding, and Interpoles. The stator produces the magnetic …

Mechanical Losses in dc machine. The losses that take place because of the mechanical effects of the machines are known as mechanical losses. Mechanical losses are divided into bearing friction loss and windage loss. The losses occurring in the moving parts of the machine and the air present in the machine is known as Windage losses.

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 ...

• dc switching equipment installation • intercell and battery terminal connector construction • shrouds & physical barriers over terminals • dc circuit protection • location of batteries • separate rooms for batteries rated over 24 volts and 10 ampere-hours (at 1-hour rate) • arrangement and accessibility of cells

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 …

4. Compound wound D.C. machine: A Compound machine is a machine which has both shunt and series fields. Two windings are carried out by each pole of the machine. The series winding has few turns of large cross-sectional area, and the shunt windings have many turns of fine wire. It can be connected in two ways.

power diodes providing a DC current for the rotor field windings. Depending on the manufacturer, the exciter either uses collector rings and brushes to pass the DC current to the rotor (General Electric machines). Westinghouse generators use a brushless exciter system. Stator: The Stator has two primary parts: the stator core and the armature

Introduction. Operating Principles and Construction of Single Phase Transformers. Modeling of Single Phase Transformers. Equivalent Circuits of Single Phase Transformers. Testing of Single Phase Transformers. Efficiency of Single Phase Transformers. Voltage Regulation of Single Phase Transformers. Parallel Operation of Single Phase Transformers.

DC generators are used to reimburse the voltage drop within Feeders. DC generators are used to provide a power supply for hostels, lodges, offices, etc. This was a comprehensive explanation about DC generators. From the information above, we can conclude that the main advantages of a DC generator are its simple construction and design.

Construction of a Commutator. ... In a DC machine, each armature coil contains two commutators attached to its end. The commutator segments and brushes should maintain a continuous moving contact for the better transformation of the current. More than one coil is used in DC machines to avail larger output values.

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 machine, which includes construction, working, parts, EMF equation, types, its losses, and applications.

A DC generator is often used as a DC generator motor without altering its construction. So, a dc generator motor may usually be called a DC machine. The key parts of DC generators are yoke, poles, pole shoes, armature core, armature winding, commutator, brushes, magnetic field system, commutator, end housings, bearings, and Shafts.

A DC motor is an electrical machine that converts mechanical energy into direct current and vice-versa. ... the radially magnetized permanent magnets are placed inside the stator core to generate flux. Whereas the rotor consists of a conventional DC armature with commutator segment and brushes. ... The construction of a DC shunt motor is ...

Brushed DC motors are generally available in two types, depending on the construction of the stator: permanent magnet or wound field. Both motor types use current and windings to produce a magnetic field in the rotor, but they differ in how the stator magnetic field is produced: via permanent magnets inside the stator or with electromagnetic windings.

stator-construction. 1).Outer Frame. This is an external part of the motor. The main function of this frame is to provide support for the core as well as inside parts of the machine. For small motors, the external part is cast however for the huge machine. The …

The field winding or DC winding are concentrically wound on the salient pole rotor. This type is only suitable for low speed machine. It is not favorable for high speed machine as due to high centrifugal force on the salient pole, the pole faces may damage. The basic construction of rotor of synchronous machine is shown below.

DC motor has magnetic poles that fit into the inner wall of the Yoke with the help of screws to tighten them up. Poles have two parts: The Pole Core and the Pole Shoe. These two parts are fixed together by hydraulic pressure and are attached to the Yoke. Each part of the Poles has a specific task based on its design.

The yoke make by cast steel for large machines and cast iron for a small machine. It uses to protect the internal parts of the DC machine and gives mechanical support to the poles. The yoke provides a return path for magnetic flux. In the yoke, the laminations are not required, but the modern machines uses the laminations in yoke.