File:An elementary book on electricity and magnetism and their applications (1919) (14597308419).jpg

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Identifier: elementarybookon00jack (find matches)
Title: An elementary book on electricity and magnetism and their applications
Year: 1919 (1910s)
Authors: Jackson, Dugald C. (Dugald Caleb), 1865-1951 Jackson, John Price, b. 1868 Black, Newton Henry, b. 1874
Subjects: Electricity Magnetism
Publisher: New York, The Macmillian Co
Contributing Library: Internet Archive
Digitizing Sponsor: Internet Archive

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About This Book: Catalog Entry
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Fig. 367. — Double helical gears for reducing speed of two steam turbines(right) and transmitting 3000 h. p. to propeller shaft (left). ELECTRIC TRACTION 515 so designed in its case as to give an elastic support for thepinion shaft in a floating frame, which is carried on hydraulicrams. This support renders the gearing practically noiselessand insures nearly perfect alignment between gear and pinionunder all conditions. The transmission efficiency of reductiongearing may exceed 98 per cent. The other plan is to use between the prime mover and thepropeller electrical transmission (Fig. 368). In this methodthe propeller is driven by an electric motor mounted directly
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Fig. 368. — Plan of ship with electrical transmission. on its shaft and furnished with current from a high-speed turbo-generator set located in any convenient part of the ship. Forexample, a 5000-kw. steam turbine driving a bipolar 2200-volt,2000-r.p.m., 3-phase alternator supplies current to two induc-tion motors, each of which drives a propeller shaft at 110 r.p.m.The advantages of the electrical plan are (1) obtaining thedesired speed reduction, and (2) dispensing with any additionalturbines for running astern. Both solutions have been tried out, and the general tendencyseems to be in favor of mechanical gearing for small ships oflow power, making long journeys at full speed, and the electri-cal transmission for large ships requiring different speeds andexcellent manceuvering ability. 516 ELECTRICITY AND MAGNETISM Problems 1. A trolley wire shown in figure 369 is Xo. 0 hard drawn copper(0.53 ohms per mile) and the feeder is Xo. 0000 annealed copper cable(0.25 ohms per mile). The

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