Gasoline Automobiles

Gasoline Automobiles

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 edition. Excerpt: ... their flow are called eddy currents. They are objectionable on account of heating the armature and reducing the electric pressure that is induced in the armature coil. In order to eliminate the eddy currents as far as possible, the core is made up of thin sheet-metal punchings or stampings, as shown in Fig. 24. The metal sheets from which the pieces are punched or stamped are about the thickness of thin stovepipe iron or even thinner. Iron and steel of the softest and purest quality are used in the best construction. The stampings are placed side by side to build up the core. They are sometimes separated from each other by thin sheets of paper, so as not to come into close metallic contact and thus form electric connection. In other cases, only the black oxide of iron on the surface is depended on to insulate the stampings from each other electrically. The set of stampings is compressed together and fastened by bolts and rivets. 40. Armature Winding.--The electric pressure, or voltage, of the elementary generator shown in Fig. 21 can be doubled by giving the armature winding two turns around the core instead of one, if the two turns are in series. The turns are in series when, in winding the coil, the wire is wrapped twice around the core instead of once, and the two ends are connected as before. The series-winding is the same as wrapping a string twice around a package. If the number of turns in series is increased still more, the voltage that the armature will develop will be correspondingly increased, provided all' other conditions remain the same as before. In actual practice, for this form of winding, the voltage of the generator is nearly proportional to the number of turns of winding on the armature core. An armature wound as in...
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Product details

  • Paperback | 182 pages
  • 189 x 246 x 10mm | 336g
  • United States
  • English
  • black & white illustrations
  • 1236839110
  • 9781236839114