. Electric traction for railway trains; a book for students, electrical and mechanical engineers, superintendents of motive power and others .. . shaft by means of spiral technical description of Baltimore & Ohio, New Haven, and Valtel-lina locomotives, and New Haven motor cars which follow. Berlin-Zossen motor cars, in the high-speed tests of 1903, used fourthree-phase, 6-pole, 435-volt induction motors of 250-h. p. each. Siemensand Halske motors, for an 85-ton car, were mounted rigidly upon thedriving axles; while A. E. G. motors, under a 99-ton car, were mountedon a hollow shaft
. Electric traction for railway trains; a book for students, electrical and mechanical engineers, superintendents of motive power and others .. . shaft by means of spiral technical description of Baltimore & Ohio, New Haven, and Valtel-lina locomotives, and New Haven motor cars which follow. Berlin-Zossen motor cars, in the high-speed tests of 1903, used fourthree-phase, 6-pole, 435-volt induction motors of 250-h. p. each. Siemensand Halske motors, for an 85-ton car, were mounted rigidly upon thedriving axles; while A. E. G. motors, under a 99-ton car, were mountedon a hollow shaft, and spring-supported from the driving wheels. Thelatter plan greatly reduced the track destruction. [^ELECTRIC RAILWAY MOTORS FOR TRAIN SERVICE 209 Crank rod locomotive motor suspension involves motors with cranks onthe armature shaft, which transmit the power to the drivers, or to a jackshaft and then to the drivers. The motor is mounted high on the loco-motive frames, and is spring-mounted. Mechanical connections oflocomotive motors will be treated under ^^Electric Locomotive Design,and under ^Technical Descriptions of Fig. 50.—Valtellina Locomotive Motor on Italian State Railway, 1906. Three-phase, .3000-volt, 15-cycle, 1200-h. p., 3-speed. Length of body 51 inches, length of shaft 101 inches, diameter of body 74 inches, diameter of collector rings 12 inches. 14. Trucks on which motors, cars, and locomotives are mountedcould advantageously form the subject of a book. Technical descrip-tions of trucks for the principal electric locomotives will be of trucks are valuable for data. See references on trucks. SPEED-TORQUE CHARACTERISTICS OF MOTORS. Characteristic curves of a motor are those which show the relationof power to the speed and torque. Speed-torque curves are plotted byusing the kilowatts, or amperes at a fixed voltage as a base, and the14 210 ELECTRIC TRACTION FOR RAILWAY TRAINS corresponding speed and torque in the vertical scale. For
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Keywords: ., bookcentury1900, bookdecade1910, bookidelec, booksubjectrailroads
