Electric Railway Motors Their Construction Operation And Maintenance

Author : Nelson Williiam Perry
Publisher : Theclassics.Us
ISBN 13 : 9781230380438
Total Pages : 58 pages
Book Rating : 4.3/5 (84 download)

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Download or read book Electric Railway Motors; Their Construction, Operation and Maintenance. an Elementary Practical Handbook ... with Rules and Instructions for Motormen written by Nelson Williiam Perry and published by Theclassics.Us. This book was released on 2013-09 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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. 1894 edition. Excerpt: ...if we place 5 lamps in series on the usual 500-volt circuit, there will be just enough pressure to give each of them what is required to operate it at normal candle power. We are thus limited on street cars operating on the usual 500-volt circuits to 5 lamps placed in series. If we want more, we must arrange another series of 5, for if we placed 6 or 7 on the first series each would only receive or of 500 volts, which would not be sufficient to illuminate them to full candle power, and if we placed but 1 or 2 on the second circuit, in the case of the single lamp it would receive the full pressure of 500 volts, and in the case of 2 lamps, each would receive 250 volts, which in both cases would be entirely too much. We might, of course, make up the second series of 1 or 2 lamps and dead resistances equivalent to the resistance that would be offered by the additional lamps required to make up the series of 5, but these dead resistances would consume as much energy as the lamps they replaced and give no useful return, so that it would be much better to complete the second series with lamps than with dead resistances. If we had a second series of 5 lamps, this second series would be in multiple with the first. The same reason which compels us when using 100-volt lamps on a 500-volt circuit to place 5 of them in series would compel us in case our circuit was at 1000 volts to use 10 lamps in series. MULTIPOLAR FIELDS. Referring to Fig. 43 we see how an unbroken iron ring may be wound so as to have four distinct poles. In practice it is desirable to have as little air space.between these polar surfaces and the armature as possible, and for this purpose the ring which is to become our multipolar magnet is cast with extensions, called pole pieces, ..