Continuous and Alternating Current Machinery

Continuous and 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. 1914 edition. Excerpt: ...a Resonant Circuit. Suppose we have an inductance of 0.1 henry, a capacity of 70.4 micro farads and a resistance of 2 ohms connected in series to a 60-cycle, 110-volt line. How much current will flow and what will be the voltage across each part of the circuit? The drop across the inductance = 2%)LI=37.7 X 0.1X 55 = 2073 volts. Across the condenser 55 377x70.4X10-6 = 2073 voltsAcross the resistance 55X2 = 110 volts. Danger of tlie Resonant Condition. Thus it is seen that in a resonant circuit having a low resistance enormous voltages may build up across parts of the circuit; the voltage across one part of the circuit may be many times greater than the voltage impressed on the whole circuit. This condition of resonance does not occur very frequently in practice as the frequencies in common use are too low to give resonant circuits with ordinary inductances and capacities. It does, however, sometimes occur and then line insulators, transformer windings, etc. are broken down due to the high voltages set up in different parts of the circuit. CHAPTER VII THE ALTERNATING CURRENT GENERATOR 56. General Construction. The alternating current generator, or alternator, as it is frequently called, consists of a field structure, magnetized by electro-magnets, and an armature, in the winding of which the electromotive force is generated. In three respects the alternator differs greatly from the continuous current generator; it has no commutator, the field structure rotates instead of the armature as in the case of c-c. machines and an alternator is practically never self-exciting. Small alternators sometimes have a stationary field and a rotating armature, but all large alternators are of the revolving field type. Slip Rings Instead of Commutator. In case the...show more

Product details

  • Paperback | 102 pages
  • 189 x 246 x 5mm | 195g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236650204
  • 9781236650207