Alternating Current Machinery

Alternating Current Machinery

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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. 1905 edition. Excerpt: ...poles are determined by setting each of the marks in succession into coincidence with a given field pole tip. THE TRANSFORMER. 81. The transformer consists of two separate and distinct coils of wire insulated from each other, and wound upon one and the same laminated iron core. Fig. 211 shows a sectional view of a common commercial type of transformer. In practice, one of the coils receives alternating current from a high-(or low-) voltage source of supply;and the other coil delivers alternating current to a receiving system at alow (or high) voltage. When the transformer receives alternating current at high voltage and delivers it at low voltage, we have what is called step-down transformation; when the transformer receives alternating current at low voltage and delivers it at high voltage, ws have what is called step-up transformation. The coil of a transformer which receives alternating current from a source of supply, is called the primary coil; and the coil which delivers alternating current is called the secondary coil. In Fig. 217, each limb of the core is wound with half of the secondary coil (coarse wire) next to the core, and witli half of the primary coil (fine wire) over the secondary. The alternator, as we have already seen, is a machine in which an alternating electromotive force is produced by the cutting of a permanently established magnetic flux by wires on account of the motion of the flux relative to the wires. The transformer, on the other hand, is an arrangement whereby an alternating electromotive force is produced in a stationary coil of wire (secondary) by reversals of magnetic flux through a stationary iron core, these reversals of flux being produced by alternating current supplied to the primary coil of the transformer....show more

Product details

  • Paperback | 110 pages
  • 189 x 246 x 6mm | 213g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236592093
  • 9781236592095