Direct Current Machine an electric rotating machine that converts mechanical energy to DC electrical energy a generator or vice versa a motor It is reversible—that is the same machine can operate both as a generator and as a motor For example traction motors of rolling stock and servomotors of high power DC electric drives operate
Get PriceNowadays for electric power distribution alternating current is mostly used as it has significant advantages over direct current in transmission and of the biggest advantages of DC power is its ability to be used in special AC power transmission is not practically feasible or possible over long distances
Get PriceConstruction of DC motor Armature and field connections Separately excited machines Self excited machines Shunt wound DC motor Series wound DC motor Compound wound DC motor Speed of motor Torque equation of DC motor Speed control of DC motor Electric motors efficiency importance Rotor losses Direct current motors
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Get PriceArmature reaction in DC machines •If the magnetic field windings of a dc machine are connected to a power supply and the rotor of the machine is turned by an external source of mechanical power then a voltage will be induced in the conductors of the rotor This voltage will be rectified into a DC output by the action of the machine s commutator
Get Price01/04/2024 Operation Construction and Functionality of Direct Current Machines brings together many concepts from the most basic working principles and construction of DC machines to more advanced topics such as electro magnetism armature reaction parallel operations and many more
Get PriceThe direct current potential drop DCPD technique may be used in crack propagation tests to measure the crack growth rate CGR Potential probes attached to the specimen allow the variation of the crack length to be estimated In this research the DCPD technique using one single potential probe was applied to solid bar specimens without any initial notch or crack subjected to low
Get PriceDirect Current Machines • Direct current DC machines are driven from a DC power supply DC machines are the most versatile of all rotating electrical machines Their speed may be easily adjusted in very fine increments ranging from standstill to rated speed and even above • DC machines can develop rated torque at all speeds from standstill
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Get PricePrinciple of DC Motor When a current carrying conductor is placed in a magnetic field it experiences a torque and has a tendency to move In other words when a magnetic field and an electric field interact a mechanical force is produced The DC motor or direct current motor works on that principle This is known as motoring action
Get PriceConstruction of DC Generator The basic constructional parts of a DC machine are as follows Yoke The outer frame of the machine called Yoke It is made up of Cast iron or steel Yoke gives the mechanical strength and protection from the surroundings to the machine In simple words the outer body of the DC generator
Get PriceA machine consist of two main part Stationary part Rotating part Stationary part As the name signifies stator is the part which doesn t move or remain fix in its position The stationary part of the DC machine consists of main poles The function of the main pole in DC machines is to provide a low reluctance path for the magnetic flux
Get PriceThe construction of the DC machine can be done using some of the essential parts like Yoke Pole core pole shoes Pole coil field coil Armature core Armature winding otherwise conductor commutator brushes bearings Some of the parts of the DC machine is discussed below Construction of DC Machine Yoke Another name of a yoke is the frame
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Get PriceIn a textbook for a graduate course in such fields as electrical mechanical computer and chemical engineering Amin and Rehmani discuss direct current machines They present the principles of operation construction details and functions of each part and each type and describe the internal interaction of magnetic fields
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Get PriceReal 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 known as the field •Rotor The rotor is the rotating part of the machine The rotor carries a distributed winding and is the winding
Get PriceA direct current machine is an electromechanical device that is used to convert electrical energy into mechanical energy or vice versa The construction of direct current machine consist of yoke pole and pole shoe field winding armature core armature winding commutator brushes shaft and bearings Yoke The yoke is also known as the frame
Get PriceThe winding which produces the main flux is called field winding The permanent magnet may also be used to produce the main flux in some machine machines are of mainly two types the generator and the motor The device that converts mechanical energy into electrical energy is called generator and the device that converts the
Get PriceOperation Construction and Functionality of Direct Current Machines Muhammad Amin Published byIGI Global 2024 ISBN 10 1466684410ISBN 13 9781466684416 Seller Welcome Back Books Toledo OH Contact seller Seller Rating Book New HardcoverCondition NEW US$ Convert currency
Get PriceAbstract Historically DC machines were the first to be developed because the only available electrical power source was the DC voltaic cell The advantages of alternating current were later recognised and the invention of the induction motor was an important factor in securing acceptance of the alternating current system
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Get Price3 Principles of Direct Current Machines Introduction Direct current dc machines operate on dc voltages and currents Recall from Chapter 2 that time varying currents flowing through properly placed windings can lead to generation of a rotating magnetic field Direct currents do not vary with time and it may seem puzzling at first glance how they may result in rotation
Get PriceDirect current DC machines are electromechanical energy converters in which the electrical energy is exchanged with their environment supply or load under the form of direct voltages and currents The DC machines are reversible and can operate as a motor or as a generator This chapter presents main notations such as load torque
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