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Electrical Engineering for Electric Light and Power Artisans and Students; (Embracing Those Branches Prescribed in the Syllabus Issued by the City and

Electrical Engineering for Electric Light and Power Artisans and Students; (Embracing Those Branches Prescribed in the Syllabus Issued by the City and


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 Excerpt: ...paths, the F. M.f. developed will be NP; x voits, 10" a and this is the most general form of the expression for the E.m.f. developed. The question of commutation now requires attention, for it must be remembered that one of the most serious difficulties which have to be overcome in designing a direct-current dynamo is that of sparking at the brushes; in fact, the output of a machine is often fixed by the appearance of sparks at the brushes, Fig. 221 which if left unchecked may go on increasing in magnitude until they destroy the commutator. In order to enable the student to see clearly how this phenomenon is produced, we will consider the case of an armature of the simplest type, viz.--an iron ring wound with a number of turns of copper wire, each turn being connected to a commutator segment as shown in fig. 221. The brushes are laid on the commutator, one at each extremity of a diameter, and each brush is assumed to be just a little wider than one segment. It can be shown that any winding, however complex, can be reduced to this scheme, so that what follows is of universal application. Suppose the armature to be driven in the sense shown in the figure, and that the brushes are connected to an external resistance; currents will then flow in the armature conductors in the direction indicated by the arrows. In the coil A the current flows in one direction and in the coil c in the opposite direction, whilst the coil n is short-circuited by the brush. It is thus evident that as the armature revolves each coil as it passes under the brush has the current flowing in it 'commutated, ' or changed in A H odirection. In figs. 222, 223 and 224 three stages of the commutation of the current are shown. The student will probably have learned by this time that when tw...


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Product Details
  • ISBN-13: 9781236009586
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 262
  • Spine Width: 14 mm
  • Width: 189 mm
  • ISBN-10: 1236009584
  • Publisher Date: 16 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 472 gr

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Electrical Engineering for Electric Light and Power Artisans and Students; (Embracing Those Branches Prescribed in the Syllabus Issued by the City and
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