Last edited by Sajind
Friday, January 31, 2020 | History

2 edition of Dynamo-electric machinery found in the catalog.

Dynamo-electric machinery

Silvanus Phillips Thompson

Dynamo-electric machinery

a manual for students of electrotechnics.

by Silvanus Phillips Thompson

  • 156 Want to read
  • 17 Currently reading

Published by Spon in London .
Written in English

    Subjects:
  • Electronic machinery

  • The Physical Object
    Paginationxii, 835 p. 19 pl.
    Number of Pages835
    ID Numbers
    Open LibraryOL16674361M

    The current generated in the circuit of a D. The few uses for electricity, such as electroplatingused direct current provided by messy liquid batteries. Thus, the output voltage is brought back up to its original value. The dynamo begins rotating while not connected to an external load.

    Books from Dynamo-electric machinery book period are often spoiled by imperfections that did not exist in the original. Since the currents in the stator windings vary in step with the position of the rotor, an alternator is a synchronous generator. Purchasers can download a free scanned copy of the original book without typos from the publisher. The secondaries of the transformers will have two phases 90 degrees apart in time, and a balanced two-phase load will be evenly balanced over the three supply phases.

    The size and mass of the rotor was made large so that the rotor would act as a flywheel to help smooth out any sudden surges or dropouts in the applied power. It used a permanent magnet which was rotated by a crank. The efficiency of modern dynamos is often 96 to 98 per cent. Each of these two parts is composed of three separated groups of coils.


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Dynamo-electric machinery by Silvanus Phillips Thompson Download PDF Ebook

In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. It is well known that when the armature is revolved between the poles of the field-mag nets currents are generated in the iron body of the armature which develop heat, and'consequently cause a Dynamo-electric machinery book of power.

We pride ourselves on not only creating a pathway to an extensive reservoir of books of the finest quality, but also providing value Dynamo-electric machinery book every one of our readers.

The motion is relative, that is, either the conductor or the magnet may be the moving part. The field-magnets of some of the earlier dynamos were permanent steel magnets, and such machines were called magneto-electric machines Dynamo-electric machinery book magnetos.

Purchasers can download a free scanned copy of the original book without typos from the publisher. The common number of alternations or reversals often called cycles in commercial alternators is either or 60, but as low as 25 are used in the Niagara Falls electric plant.

Many varieties of dynamo - electric machine have been constructed upon the foregoing principles. Our staff has thoroughly reviewed every page of all the books in the collection, repairing, or if necessary, rejecting titles that are not of the highest quality.

The polyphase alternating-current system is the only one commercially feasible for long-distance transmission of electric energy see Transformers and Transmission of Powerand even for many shorter lines there are engineering advantages in its use.

Most machines of this class furnish alternate currents. The use of alternating currents has increased largely within the last 15 years, because of the inventions of transformers and of the induction-motor.

It consists of a set of contacts mounted on the machine's shaft, combined with graphite-block stationary contacts, called "brushes", because the earliest such fixed contacts were metal brushes. 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.

To get the K. The main objects of my invention are to increase the efficiency of the machine and to facilitate and cheapen the construction of the same; and tothis end my invention relates to the magnetic frame and the armature, and to other features of construction, hereinafter more fully explained.

The rotary converter can directly convert, internally, any type of electric power into any other.

The New Student's Reference Work/Dynamo

The second group is then insulated and the third group wound, the coils of this group being connected to those bars to which they would be connected in the usual way. One machine does not fall Dynamo-electric machinery book within any of these classes, and that is the' extraordinary tentative dynamo of Edison, in which the coils are waved to and fro at the ends of a gigantic tuning - fork, instead of being rotated on a spindle.

Renewed December 1, Electrical problems? To convert the alternating current to DC, Pixii invented a commutatora split metal cylinder on the shaft, with Dynamo-electric machinery book springy metal contacts that Dynamo-electric machinery book against it.

The armature core being constructed as shown, it will be easily seen that on those portions of the armature that are the most remote from the axis, and where the currents are 3 5 principally developed, the length of iron in the generating direction is only a small fraction of the total length of the armature-core, and besides this the iron body is subdivided in the generating direction, and therefore the Foucault currents are greatly reduced.

Due to Faraday's law of induction the motion of the wire within the magnetic field creates an electromotive force which pushes on the electrons in the metal, creating an electric current in the wire. It is highly unlikely that this would occur with one of our books. Additional matter has accordingly been added, involving an increase of one hundred and ten in the number of pages and of ninety-four Excerpt from Dynamo-Electric Machinery: A Manual for Students of Electrotechnics Since the publication of the first edition of this work in the autumn ofmuch has been done towards perfecting the dynamo, both in practice and in theory.

An armature for dynamo-electric machines, having a core composed of disks of various diameters, in combination with separate superimposed coils connected to the commutator-plates in alternate groups, substantially as set forth.

But since the magnetization of the iron is, even when far from saturation point, something less than the magnetizing force, it is in practice found that the electric work of the machine is proportional only to something slightly less than the third power of the speed.

An advantage of Gramme's design was a better path for the magnetic fluxby filling the space occupied by the magnetic field with heavy iron cores and minimizing the air gaps between the stationary and rotating parts.

Dynamo Electricity

The little dynamos used in telephone call-boxes are magnetos. Silvanus Thompson, delivered before the Society of Arts in December, USA USA USA US A US A US A US A US A Dynamo-electric machinery book A US A US A US A Authority US United States Prior art keywords armature dynamo coils core iron Prior art date Legal status (The legal status is an assumption and is not a legal 42comusa.com by: 2.

Dynamo Electric, Williamsburg, Virginia. likes · 1 talking about this · Dynamo-electric machinery book were here. Dynamo Electric Incorporated is a commercial & residential electrical contractor servicing Williamsburg /5(12).

About Us About Us - Dynamo Electric is a Class A, insured residential & commercial electrical contractor. Our certified electricians services include remodeling wiring, electric panel upgrades, kitchen wiring, whole house surge protection, warehouse wiring upgrades.

Dynamo is also Generac Generator Dealer service the Williamsburg area of Virginia.] Dynamo-Electric Pdf. ends of the wire of this pdf coil the magnetism cannot change there so suddenly, and the primary current is not able to do so much work in the magnet, and therefore it is more free to exert its own force, and therefore it enables the lamp to glow with greater brightness than it Cited by: 1.Alternating-Current Machines: Being the Second Volume of Dynamo Electric Machinery, Its Construction, Design, and Operation by Samuel Sheldon and Hobart Mason and Erich Hausmann Overview - This is a reproduction of a book published before High speed dynamo electric machinery by Hobart, H.

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(Henry Metcalf), ebook 42comusa.com - the best online ebook storage. Download and read online for free High speed dynamo electric machinery by Hobart, H. M. (Henry Metcalf), /5(4).