File:Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics (1892) (14767413764).jpg

Identifier: modernmechanisme00benj (find matches)
Title: Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics
Year: 1892 (1890s)
Authors: Benjamin, Park, 1849-1922
Subjects: Mechanical engineering
Publisher: New York, D. Appleton
Contributing Library: Mugar Memorial Library, Boston University
Digitizing Sponsor: Boston University

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t;lsiftt *) C Weight of win- in armature... fields Total weiKht Number of lij^hts 1,050 II-.-) 17 jyo CM 1,0.5065 0,0(X)i,:i(K) III. 1,050130 •153-ti00 2,600 The No. Ill has an armature about 2 ft. in diameter and 2 ft. Jong. It has 16 poles, andruns at 1.000 j-cvcdutions per min. The armatui-e i)lates luive each six large holes for ventila-tion and lightness. The weight of armatui-c is 2.000 lbs. The insulation is mica and copalvarnish, which is foun<l to be much superior to shellac or any other material tried. Fig. H4 is a side view and lig. x.) is an end view, from which the construction will beeasily iniderstood. The field-magnit.s bolted to the external frame of the machine, form acircle, radiating inward toward the arnuiture, which is mounted in the center on standardsrising from the base. They are of elliptical form, the longer axis of a cro.ss-section of eachcore being parallel to the armature-shaft, as shown at ^/ nudi/g. Fig. 84, the edges of the Kttf!i;^ttii4^\
Text Appearing After Image:
234 DYNAMO-KLECTRIC MACHINES. cores being shown at //, Fig. 86. The winding of each magnet is opposite to that of theadjacent one, so as to produce north and south polarity. The coils are slipped on the cores after being wound. The arm-ature-core is composed ofsheet-iron disks, insulated bypaper, and having tubularopenings for ventilatit>n pa-rallel to the a.xis : a greatnumber of these being laidtogether, the openings regis-tering to form the tubes, andthen bolted together by end-plates, as shown. The wind-ing ditfers from that of the(Ti-amme ainiature in havingno interior wire. The coilsconsist of single layers ofwires wound on the externalsurface of the core and loopedaround projections ?« m^ atthe ends, attached to non-magnetic rings o, so thatthe j)lanes of the coils are atright angles to the radii ofthe armature, and there areno crossing wires at the ends,as in the Siemens, nor wirein the interior of the ring, asin the Gramme : the endsbeing exposed for ventilationthrough th

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