Jul 04, 2013· DC Motor: motor that runs on direct current (DC) electricity. 2. Principle of operation of DC Motor: When current carrying conductor is placed in a magnetic field it experience a force. 3. Construction of DC Motor: 4. Construction of DC Motor: 5. Function of each part of DC Motor: Yoke: • It is outer cover of dc motor also called as frame.
Constructional Features of DC Machines; Generated EMF and Torque in DC Machines; Armature Reaction; Commutation in DC Machines; Separately Excited DC Generators; DC Shunt Generators; Compound DC Generators; Interconnected DC Generators; Characteristics of DC Shunt Motors; Starting of DC Shunt Motors; Speed Control of DC Shunt Motors; Braking of DC Shunt Motors
Advantages of Induction Motor. The motor construction and the way electric power is supplied all give the induction motor several advantages is shown in figure below. And let's see of them in brief. Advantages of Induction Motor. Low cost: Induction machines are very cheap when compared to synchronous and DC motors. This is due to the modest ...
Every DC motor has six basic parts axle, rotor (, armature), stator, commutator, field magnet(s), and brushes. In most common DC motors (and all that BEAMers will see), the external magnetic field is produced by highstrength permanent magnets 1. The stator is the stationary part of the motor this includes the motor casing, as well as two or more permanent magnet pole pieces.
Unit/s: 61: Features and Applications of Electrical Machines Outcome/s: (4) Understand electrical machine control circuits and systems Grading criteria: P9 Describe the operation and use of a stop/start/retain relay control circuit for an AC or DC machine.
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Briefly, we can say that Dc compound motor is a combination of both a shunt wound Dc motor and series wound Dc motor which means that compound motor has the advantage of high starting torque and efficient speed regulation so it can be used in industrial applications include: Drivers. Freight elevators. Stamping Presses. Rolling mills. Mixers.
Simple in construction, a generalpurpose dc brush motor includes an armature or rotor, a commutator, brushes, an axle, and a field magnet. Naturally, a battery or power supply is required.
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Contents 71 Introduction Features of a DC Machine 72 Construction Stator Field from COOL at Cambridge
Characteristics of DC Shunt Motor. 2. Speed V s Armature current characteristic (N/I a) 3. Speed V s Torque characteristic (N/T a) The fig above shows the circuit diagram of shunt motor. In this circuit the field winding is directly connected to the source voltage, so the field current I sh and the flux in a shunt motor are constant.
With DC brushless, as machine size grows, the magnetic losses increase proportionately and part load efficiency drops. With induction, as machine size grows, losses do not necessarily grow. Thus, induction drives may be the favored approach where highperformance is desired; peak efficiency will be a little less than with DC brushless, but ...
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1. slip rings link the rotor's field winding to an external dc source. 2. dc generator exciter. • a dc generator is built on the same shaft as the ac generator's rotor • a commutator rectifies the current that is sent to the field winding. • Low speed, large hydrogenerators may have more than one hundred poles.
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A brushtype DC motor labeled as 3/4 HP 110V powers the lathe via a continuously variable electronic speed control. This variable speed feature is one of the greatest features of the 7x10 since it allows you to adjust speed instantly, even while turning a workpiece, without the hassle of pulleys and belts used on many low cost machines.
Unit 61: Features and Applications of Electrical Machines Assignment 3 – DC Machines Using your class notes and any other suitable resource, attempt the following tasks. Support your answers with relevant labelled diagrams. (The relevant grading criteria are given in brackets after each task) 1. Explain the features, characteristics and application of two
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Machine Design is part of the Business Intelligence Division of Informa PLC. ... Coreless DC Motors. ... The motor also features a low moment of inertia, but the mechanical time constant is ...
Synchronous machine construction. Like DC machines, the field source creates a magnetic field, the armature winding has a voltage induced in it by the field. Also like DC machines, the field can be produced using either a field winding or by using permanent magnets. PM (permanent magnet) machines are common in small sizes,...
Aug 09, 2018· Types of DC Generators. Mechanical energy can be created by using water turbines, steam turbines, internal combustion engines etc. And a generator converts this mechanical energy to electrical energy. Generators can be broadly classified as AC generators and DC generators. Here lets take a look the types of DC generators.