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What is Excitation System? Definition & Types of Excitation ... The excitation system is mainly classified into three types, DC excitation system, AC excitation System and static excitaton system. The system which is used for providing the necessary field current to the rotor winding of the synchronous machine, such type of system is called an excitation system.

Construction of DC Machine - YouTube Mar 25, 2018 · In this video, Construction of DC machines with all the parts are conceptually explained. Must Watch it Subscribe our Electrical Engineering Related channel 'Electrical Academy' to get the ... Video Duration: 29 minViews: 171KAuthor: #Electrical AcademyPeople also ask What is the basic construction of a DC machine?

DC motor - Wikipedia DC motors were the first form of motor widely used, as they could be powered from existing direct-current lighting power distribution systems. A DC motor's speed can be controlled over a wide range, using either a variable supply voltage or by changing the strength of current in its field windings.

Brushless DC Motor (BLDC) – Construction, Working Principle ... A brushless DC motor (known as BLDC) is a permanent magnet synchronous electric motor which is driven by direct current (DC) electricity and it accomplishes electronically controlled commutation system (commutation is the process of producing rotational torque in the motor by changing phase currents through it at appropriate times) instead of a ...

Electrical Transformer - Basic construction, working and ... Electrical transformer is a static electrical machine which transforms electrical power from one circuit to another circuit, without changing the frequency. Transformer can increase or decrease the voltage with corresponding decrease or increase in current. Working principle, construction and types of transformer -

Construction of a DC Generator - explanation of its various ... Construction of a DC Generator A DC Generator is an electrical device which converts mechanical energy into electrical energy. It mainly consists of three main parts, i.e. Magnetic field system, Armature and Commutator and Brush gear.

Construction of Dc motor (all parts of dc motor in details ... Nov 26, 2017 · Construction of dc motor in detail, there is a yoke (Magnetic frame), pole core and pole shoes, the armature core, armature winding (conductor), commutator, and brushes and bearings. Each part of those has its identity and great importance, advantage and sometimes problems, now we will separately explain each part.

DC Generator !! Basic concept !! - YouTube Jul 12, 2017 · Thus video provides all the basic concept of dc generator in detail. Video Duration: 54 minViews: 330.1KAuthor: EEE IQConstruction of DC Machine - Polytechnic Hub Yoke. It provide mechanical Support for poles. It also provide protection to whole machine from dust, moisture etc. It also carries magnetic flux produced by the poles. Pole & Pole core. Pole of a generator is an electromagnet. The field winding is winding over pale. Pole provides magnetic flux when field winding is excited. Pole Shoe. It is extended part of pole. It enlarge area of pole. Due to this enlarged area, flux is spread out in the air gap and more flux can pass through the air gap to armature. Pole coil or field windings. It is wound around pole core and called as field coil. it is connected in series to from field winding. When Current is passed through field winding it electro magnetize the poles which produce necessary flux. Construction of DC Machine (Generator & Motor) Yoke (Magnetic Frame) The outer frame or yoke serves a double purpose : It provides mechanical support for the poles and acts as a protecting cover for the whole machine. Pole Cores and Pole Shoes. The field magnets consist of pole cores and pole shoes. The pole shoes serve two purposes: they spread out the flux in the air gap and also, being of larger cross-section, reduce the reluctance of the magnetic path. Field system. The function of the field system is to produce a uniform magnetic field within which the armature rotates. Field coils are mounted on the poles and carry the dc exciting current. Armature core and Laminations. The armature core is keyed to the machine shaft and rotates between the field poles. It consists of slotted soft-iron laminations (about 0.4 to 0.6 mm thick) that are stacked to form a cylindrical core as shown in the figure. DC Machine - Construction, Working Principle, Types ... Oct 07, 2019 · 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 ...

Construction of DC Generator | Yoke Pole Armature Brushes of ... Dec 30, 2018 · But for large construction of DC generator, where weight of the machine is concerned, lighter cast steel or rolled steel is preferable for constructing yoke of DC generator. Normally larger yokes are formed by rounding a rectangular steel slab and the edges are welded together at the bottom.

What is a Transformer ? Its Construction, Working, Types and ... Fleming’s Right Hand Rule. It states that “if the thumb, the forefinger and the middle finger are held in such a way that they are mutually perpendicular to each other (makes 90 ° of Angles), then the forefinger points the direction of the field, the thumb points the direction of motion of the conductor and the middle finger points the direction of the induced Current (from EMF).

Construction Drawings: A visual road map for your building ... Drawings of the whole house, or small details, may be at a different scale. At a scale of ¼” per foot, a line 1 in. long equals 4 ft., a line 4 in. long equals 16 ft., and so on. A special architectural scale ruler (photo below) makes it very easy to read dimensions on construction drawings – or to create your own scale drawings.

What is a DC Machine? Basic structure & Equivalent circuit ... DC Machine A DC Machine is an electro-mechanical energy conversion device.There are two types of DC machines; one is 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.

What is a Transformer ? Its Construction, Working, Types and ... A transformer is an AC machine that steps up or steps down an alternating voltage or current. A transformer being an AC machine however cannot step up or down a DC voltage or DC current. It sounds a bit weird though. You might be thinking “so are there not DC transformers?”

NPTEL :: Electrical Engineering - Electrical Machines -I Operating Principles of DC Machines: Download Verified; 22: Constructional Features of DC Machines: Download Verified; 23: Generated EMF and Torque in DC Machines: Download Verified; 24: Armature Reaction: Download Verified; 25: Commutation in DC Machines: Download Verified; 26: Separately Excited DC Generators: Download Verified; 27: DC Shunt ...

DC Motors - University of Rajshahi DC 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

Construction of Induction Motor - Circuit Globe The stator is the stationary part of the induction motor, and the rotor is the rotating part. The construction of the stator is similar to the three-phase synchronous motor, and the construction of rotor is different for the different machine. The construction of the induction motor is explained below in detail. Construction of Stator

Working or Operating Principle of DC Motor | Electrical4U Jul 11, 2019 · Working or Operating Principle of DC Motor July 11, 2019 March 20, 2013 by Electrical4U The DC motor is of vital importance for the industry today and is equally important for engineers to look into the working principle of DC motor in details that we have discussed in this article.

Design & Construction of Micropiles - Crocker Ltd Geotechnical Course for Pile Foundation Design & Construction, Ipoh (29 – 30 September 2003) Design & Construction of Micropiles (by S.S. Liew & C.C. Fong) 3 Gue & Partners Sdn Bhd 2.0 TYPES OF MICROPILES AND DRILLING METHODS 2.1 Micropile Classification Micropiles are generally classified firstly according to design application and grouting

Architectural Design and Construction The modules support undergraduate courses in civil and construction engineering. The four modules cover the following: 1. Reinforced concrete design 2. Mechanical–electrical systems 3. Structural steel design 4. Architectural design and construction. This manual is specific to a PowerPoint slide deck related to Module 4, Architectural design

THEORY, CONSTRUCTION, AND OPERATION OF SYNCHRONOUS MACHINES The synchronous electrical generator (also called alternator) belongs to the family of electric rotating machines. Other members of the family are the direct-current (dc) motor or generator, the induction motor or generator, and a number of derivatives of all these three. What is common to all the members of this fam-

Brushless DC (BLDC) Motor - Construction and Working ... A Brushless DC motor or BLDC motor is a type that is most suitable for applications that require high reliability, high efficiency, more torque per weight, etc. This article explains about BLDC motors in details. Construction of a BLDC Motor. A commutator-brushes arrangement helps in achieving unidirectional torque in a typical dc motor ...

Working principle of Dc motor (How a DC motor works?) - The ... Nov 22, 2017 · Working principle of Dc motor. Working principle of dc motor … Dc motor, Dc generator both descended from the same family Dc machine which means that there isn’t a big difference between Dc motor and Dc generator contrary we will find lots of similarities between them so let’s go.

Working Principle of DC Motor - StudyElectrical.Com A DC motor is an electrical machine that converts electrical energy into mechanical energy.. The working of DC motor is based on the principle that when a current carrying conductor is placed in a magnetic field, it experiences a mechanical force.

DC Motor - National MagLab Jun 17, 2019 · A simple direct current (DC) motor is illustrated below. The motor features a permanent horseshoe magnet (called the stator because it’s fixed in place) and an turning coil of wire called an armature (or rotor , because it rotates).

DC Generator: Construction, Working Principle,Types, and ... Therefore, a DC motor otherwise a DC generator can be generally called as a DC machine. The construction of a 4-pole DC generator is shown below. This generator comprises of several parts like yoke, poles & pole shoes, field winding, an armature core, armature winding, commutator & brushes.

dc Generator Ppt - LinkedIn SlideShare Apr 30, 2013 · dc Generator Ppt 1. Electric motors and generatorsJitendra kumar1103107 2. D.C. GENERATORS-CONSTRUCTION & OPERATIONDC GeneratorsPrinciple of operationAction of CommutatorConstructional details of DC MachineTypes of DC generatorsEMF Equation 3. DC Generator 4. DC motor 5.

Basic construction and working of a DC Generator ... Hence, let's call this point as construction of a DC machine instead of just 'construction of a dc generator'. The above figure shows constructional details of a simple 4-pole DC machine. A DC machine consists of two basic parts; stator and rotor. Basic constructional parts of a DC machine are described below.

Contactor – Construction, Operation, Application and Selection Contactor – Construction, Operation, Application and Selection Contactor- Construction, Working Principle, Application An electrical contactor is a switching device, widely used for the switching of motors, capacitors (for power factor correction) and lights.

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