. Electric traction for railway trains; a book for students, electrical and mechanical engineers, superintendents of motive power and others .. . 139,000 between cranks along the axle is 78 inches; distance between axle bear- DESCRIPTION OF THREE-PHASE LOCOMOTIVES 341 ings along axle is 57 inches; distance between motor bearings along axle is 34 inches;width of motor is 51 inches; diameter of motor is 68 inches. Specifications for the 1904 locomotive required it to accelerate a448-ton train at m. p. h. p. s., and to start a 448-ton train on a cent, grade, and bring
. Electric traction for railway trains; a book for students, electrical and mechanical engineers, superintendents of motive power and others .. . 139,000 between cranks along the axle is 78 inches; distance between axle bear- DESCRIPTION OF THREE-PHASE LOCOMOTIVES 341 ings along axle is 57 inches; distance between motor bearings along axle is 34 inches;width of motor is 51 inches; diameter of motor is 68 inches. Specifications for the 1904 locomotive required it to accelerate a448-ton train at m. p. h. p. s., and to start a 448-ton train on a cent, grade, and bring it up to a speed of m. p. h. every 2 minutesfor 1 hour, without excessive heating; and further that the motors on 10-hour shop test, at rated speed and load, should not have a temperaturerise in any part exceeding 60° C. above the surrounding air. A 100 percent, overload was specified for 200 seconds, and also a 50 per cent, over-load for 60 minutes, without 40° C. rise above the surrounding air. Design of 1904 locomotives calls for one fixed middle axle, which isjournaled in the main frames. The other two driving axles have a range. Fig. 117.—Valtellina Railway Locomotive of 1906. of side movement of about one inch. The locomotive has leading andtrailing pony axles each of which has a radial movement, and one of themalso has a lateral movement at the bolster. The fixed wheel base runsfrom the middle driving axle to the bolsters at the middle of the fronttruck. The truck design results in great freedom of adjustment andsmooth running at curves. The cra^nks of the two motors are connectedat each end of the motor by a yoke, which again is connected to the crankof the middle driving axle, but the bearing on this crank has a free ver-tical movement in the rod. The 1906 locomotives have the driving axles, the pony axles, and theconnections used for the 1904 locomotives. There are, however, threeeconomical speeds, in place of two. 342 ELECTRIC TRACTION FOR RAILWAY TRAINS Mot
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Keywords: ., bookcentury1900, bookdecade1910, bookidelec, booksubjectrailroads
