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Alternating Current Generators
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Book Synopsis Alternating Current Generators by : A. Bhatia
Download or read book Alternating Current Generators written by A. Bhatia and published by CreateSpace. This book was released on 2015-02-18 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: An alternating current generator, or AC generator, produces an alternating current, which means the voltage produced alternately reverses from positive to negative polarity, producing a corresponding change in the direction of current flow. Much like a DC generator, an AC generator requires a coil to cut across the force lines of a magnetic field. This coil is attached to two slip rings, which deliver the current to and from the load destination, thus completing the circuit. Alternating current generators are often called "Alternators." The magnitude of AC voltage generated by an AC generator is dependent on (1) The strength of the magnetic field (number of lines of force) (2) The speed at which the loop rotates (3) The number of loops of wire that cut the magnetic field. A rotation speed of 3000 revolutions per minute(RPM) produces 50 Hz, and 3600 RPM produce 60 Hz. The electric current in North American homes has a frequency of 60 hertz while in Europe it is 50 Hz. An alternating current motor, or AC motor uses electrical energy to procude motion and torque. Very simple AC motors are called "Squirrel cage motors"; these have only one or more stationary coils within which a special kind of mechanical rotor is free to rotate. There is no electrical connection to the rotor from the outside. Most AC motors require a starter, or method of limiting the inrush current to a reasonable level. Types of motor starting include reactive (capacitor start and inductive start), and electronic (frequency drives and soft start drives).The reactive start method is usually used on fractional horsepower motors, and the electronic method is usually reserved for larger motors. This 4-hr Quick Book provides a basic understanding of AC motors and generators, explaining how to use them, how to calculate power, and determine torque considerations. The course is based entirely on Naval Education and Training Materials (NAVEDTRA 14177), Electricity and Electronic Training Series; Module-5 and covers Chapter 3 and 4 titled "Alternating Current Generators and Alternating Current Motors." Learning Objective At the conclusion of this course, the reader will be able to: Describe the principle of magnetic induction as it applies to AC generators. Describe the differences between the two basic types of AC generators. Explain the factors that determine the maximum power output of an AC generator. Describe the relationships between the individual output and resultant vectorial sum voltages in multiphase generators. List the factors that determine the frequency and voltage of the alternator output. Describe the purpose and procedure of parallel generator operation. List three basic types of AC motors and describe the characteristics of each type. Describe the characteristics of a series motor that enable it to be used as a universal motor. State the primary application of synchronous motors, and explain the characteristics that make them suitable for that application. Describe the features that make the AC induction motor the most widely used of electric motors. Explain the operation of split-phase windings in single-phase AC induction motors. Describe the effects of shaded poles in single-phase, AC induction motors.
Book Synopsis Electricity & Magnetism by : International Correspondence Schools
Download or read book Electricity & Magnetism written by International Correspondence Schools and published by . This book was released on 1914 with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Student Workbook I written by and published by . This book was released on 1986 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Direct Current Generators by : A. Bhatia
Download or read book Direct Current Generators written by A. Bhatia and published by CreateSpace. This book was released on 2015-02-21 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: A direct current generator, or DC generator, produces a voltage of constant polarity, which means the voltage and current do not change over time. DC generators are basically AC generators whose output voltage is switched the other way round at the proper moment, so that the direction of the voltage is always in a single direction. The AC generator uses slip rings to transfer the current to the electrical circuit, while the DC generator uses a split-ring commutator. Generators can be very small or quite huge. Commercial DC generators are commonly found in traction applications like subways and trains. Factories that do electrolysis, electroplating and those that produce aluminum, caustic soda, chlorine, and some other industrial materials need large amounts of direct current and use DC generators.An electric motor is very similar to a generator, except that power is provided to turn the rotors. They may, in fact, be described as generators "running backwards". When current is passed through the armature of a DC motor, a torque is generated by magnetic reaction, and the armature revolves. Adjustable speed is difficult to obtain with motors whose armatures are connected to fixed frequency power lines (AC motors). Here is where DC motors shine; their rotating field speed depends on the rotor speed itself. The speed of DC series motors varies with load, and torque varies inversely with speed. This makes them particularly suitable to starting high inertia loads such as railway trains. Starting a DC motor requires often an external resistor or rheostat to limit the current. The value, in Ohms, of that resistor is reduced in steps as the speed of the motor increases, until finally that resistor is removed from the circuit as the motor reaches close to its final speed.This 4-hr Quick Book provides discusses salient features of DC motors and generators in detail. The course is based entirely on Naval Education and Training Materials (NAVEDTRA 14177), Electricity and Electronic Training Series; Module-5 and covers Chapter 1 and 2 titled “Direct Current Generators and Direct Current Motors”. Learning ObjectiveAt the conclusion of this course, the reader will be able to:• State the principle by which generators convert mechanical energy to electrical energy.• State the rule to be applied when you determine the direction of induced emf in a coil.• State what component causes a generator to produce direct current rather than alternating current.• State how field strength can be varied in a dc generator.• State the three classifications of dc generators.• State the term that applies to voltage variation from no-load to full-load conditions and how it is expressed as a percentage.• State the factors that determine the direction of rotation in a dc motor.• State the right-hand rule for motors.• Describe the main differences and similarities between a dc generator and a dc motor.• List the advantages and disadvantages of the different types of dc motors.• Discuss the means of controlling the speed and direction of a dc motor.• Explain the need for a starting resistor in a dc motor.
Book Synopsis Alternating Current and Direct Current Generators by :
Download or read book Alternating Current and Direct Current Generators written by and published by . This book was released on 1992 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Alternating-current Machine Design, Being Instructions for the Design of Motors and Generators... by : Theodore Torda
Download or read book Alternating-current Machine Design, Being Instructions for the Design of Motors and Generators... written by Theodore Torda and published by . This book was released on 1908 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Alternators, Alternating-current Generators by :
Download or read book Alternators, Alternating-current Generators written by and published by . This book was released on 1991 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Alternating Currents Simply Explained by : Alfred William Marshall
Download or read book Alternating Currents Simply Explained written by Alfred William Marshall and published by . This book was released on 1908 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Elements of Alternating Currents by : William Suddards Franklin
Download or read book The Elements of Alternating Currents written by William Suddards Franklin and published by . This book was released on 1899 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Conventional Alternating-current Generators and Engine Generator Sets by :
Download or read book Conventional Alternating-current Generators and Engine Generator Sets written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Available data and techniques relevant to the selection and analysis of appropriate electrical generating equipment for application in the ICES program are presented. Of the general classes of commercially available a-c generators, the synchronous, rotating field alternator is most suited to ICES applications, and the focus of this technology evaluation. Conventional 60-Hz, alternating-current generators, with standard ratings ranging from 1.25 kVA to 10,000 kVA at voltages from 125 single-phase to 14,400 volts three-phase and speeds up to 1800 rpm are covered. Technical data for representative diesel engine-generator sets for continuous prime power ratings up to 6445 kW are presented. Approximate 1976 costs of standard electrical generating equipment are given for: (1) standard conventional alternating current generators and (2) packaged engine-generator sets. The data indicate a decrease in unit costs as the power ratings increase, with the cost of the slow-speed units somewhat greater than that of the higher speed units. Maintenance data for a typical total energy plant presently in operation indicate that the average cost of maintenance amounts to 41 cents/kWh. A plot of available data also indicates a trend to decreasing operating costs with increasing unit size.
Book Synopsis Commercial Test of a 2200 Volt Alternating Current Generator by : A. P. Pulling
Download or read book Commercial Test of a 2200 Volt Alternating Current Generator written by A. P. Pulling and published by . This book was released on 1910 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Direct- and Alternating-current Machine Design by : Francis Bacon Crocker
Download or read book Direct- and Alternating-current Machine Design written by Francis Bacon Crocker and published by . This book was released on 1908 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Direct-and Alternating-Current Machine Design Being Instructions for the Design of Motors and Generators (Classic Reprint) by : Francis Bacon Crocker
Download or read book Direct-and Alternating-Current Machine Design Being Instructions for the Design of Motors and Generators (Classic Reprint) written by Francis Bacon Crocker and published by Forgotten Books. This book was released on 2018-03-23 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Direct-and Alternating-Current Machine Design Being Instructions for the Design of Motors and Generators Branches of Science Involved in Dynamo De sign. - The following discussion of the design of dyna mos and motors will be confined to the consideration of direct-current machines. The design of a dynamo and motor relates to three essen tial parts: first, the armature carrying the conductors in which the electric energy is generated or absorbed; second, the field magnet that produces the magnetic field or flux in which the armature revolves; and third, the various mechanical parts and arrangements necessary to carry out the electrical and magnetic actions. Thus, three great branches of science - electricity, magnetism, and mechanics - are involved. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Book Synopsis Instructions for the Installation and Operation of Alternating Current Generators by : Westinghouse Electric & Manufacturing Company
Download or read book Instructions for the Installation and Operation of Alternating Current Generators written by Westinghouse Electric & Manufacturing Company and published by . This book was released on 1902 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Alternating Current Generators by : Advance Schools, Inc
Download or read book Alternating Current Generators written by Advance Schools, Inc and published by . This book was released on 1969 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A.C. Generators written by Robert L. Ames and published by Taylor & Francis Group. This book was released on 1990 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents practical criteria for designing synchronous generators. Assuming a familiarity with electro-magnetic theory and manufacturing methods, this practical guide to designing commercial machines details how to obtain reliable calculations for the various quantities involved. Recognizing that effective design involves a certain degree of compromise between many conflicting requirements, the author shows how to determine which properties are of most importance and which may be sacrificed while still producing a satisfactory machine. The use of mathematical formulas is avoided, except in a few special cases, and ample sources and references are provided at the end of the book.
Book Synopsis Direct- and Alternating-Current MacHine Design; Being Instructions for the Design of Motors and Generators by : Francis Bacon Crocker
Download or read book Direct- and Alternating-Current MacHine Design; Being Instructions for the Design of Motors and Generators written by Francis Bacon Crocker and published by Hardpress Publishing. This book was released on 2012-08-01 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.
