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Home > History and Archaeology > History > Principles of Direct-Current Machines
Principles of Direct-Current Machines

Principles of Direct-Current Machines


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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. 1919 Excerpt: ...characteristic corresponding to the chosen value of speed. It is obvious that there are two values of the current (i) which will reduce the radical to zero, hence the characteristic intersects the plane ABC in two points; one of these values of current is the other is. Between these values of current ra the radical becomes imaginary, hence the theoretical external characteristics are hyperbolas. Example.--A 4-pole, 120-volt shunt generator, rated at 25 kw. at 900 r.p.m. has a magnetization curve represented by the equation " _ 180 X amp.-turns per pole. 2000 + amp.-turns per pole The field winding has 800 turns per pole, and a hot resistance, not including the field rheostat, of 20 ohms. The armature has a simplex wave winding of 194 face conductors, one turn per element, and the armature resistance is 0.0245 ohm. The angle of brush lead is equivalent to 2 segments of the commutator. If the field rheostat is adjusted to give an open-circuit voltage of 125 volts, what will be the terminal voltage when the machine is delivering full load current? Solution.--The field ampere-turns at no load can be found from the relation " 180 X amp.-turns per pole 2000 + amp.-turns per pole whence field amp.-turns per pole at no load = 4550 4550 shunt field current at no load =-TMr = 5.7 amp. 125 shunt field resistance (total) =-_ = 22 ohms resistance in field rheostat = 22--20 = 2 ohms. Again, 25,000 full loud current.. aZl 7.43 X 194/ V deinag. amp.-turns per pole = yTM-=--v"2 92/ V-416 + n drop in armature = t"r" = (208 + "") X 0.0245 = 5.1 (nearly) generated e.m.f. = V + 5.1 180(800-416-T.) V 4-5 1 =--.. V T O.L y y 2000 + 800 '-416-Y whence V = 120.4 volts or 20.6 volts. The larger value of V is the full load voltage, the smaller...


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Product Details
  • ISBN-13: 9781236051363
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 122
  • Spine Width: 7 mm
  • Width: 189 mm
  • ISBN-10: 123605136X
  • Publisher Date: 17 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 231 gr

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