Experimental Electrical Engineering and Manual for Electrical Testing; For Engineers and for Students in Engineering Laboratories
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Experimental Electrical Engineering and Manual for Electrical Testing; For Engineers and for Students in Engineering Laboratories

Experimental Electrical Engineering and Manual for Electrical Testing; For Engineers and for Students in Engineering Laboratories


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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. 1907 Excerpt: ...by simply connecting the armature and the field of the motor in series and running the machine at no load. The terminal voltage must be kept sufficiently low; otherwise the motor will run away. The motor takes very little current when running at no load; therefore its field is so weak that iron loss can be neglected and the whole input into the armature assumed to be equal to the friction loss. Note that this is not so with shunt motors, because there the field has its full value at no load as well as at any other load, and iron loss is not negligible under any circumstances. Subtracting the values of friction obtained from this curve from the ordinates of the curves previously taken, curves can be plotted giving iron loss separately as a function of speed and field excitation. The first series of runs gives not only the total losses, but also ampere-speed curves corresponding to various terminal voltages. For the latter curves, the current in the field winding is determining, since part of the armature current is shunted around. The voltages during the test are measured across the armature; in order to refer the curves to terminal voltages, due allowance must be made for the ohmic drop in the armature and the field. For some further details of this method and sample curves, see Electric Club Journal 1904, pp. 170-174. 371. EXPERIMENT 17-F.--Efficiency of a Series Motor from its Losses.--The machine is wired up as a regular series motor (Fig. 285) and a variable resistance is shunted across the brushes. The resistance shown in the diagram in series with the field is used for regulating the main current. Have an ammeter in the main circuit, another in the armature circuit, and a voltmeter across the brushes. Run the motor at a high speed for at least 30 minu...


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Product Details
  • ISBN-13: 9781236100313
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 268
  • Spine Width: 14 mm
  • Width: 189 mm
  • ISBN-10: 123610031X
  • Publisher Date: 17 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 485 gr

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Experimental Electrical Engineering and Manual for Electrical Testing; For Engineers and for Students in Engineering Laboratories
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