. Electric traction for railway trains; a book for students, electrical and mechanical engineers, superintendents of motive power and others .. . nnecting motor is entirely spring mounted, on four spiral springs, twoon each side of the motor axle boxes. The motors are slipped intoplace, in their outer frames, from below. A motor can be removed intwo hours. Two motors weigh 27 tons. See Figure 50. DESCRIPTION OF THREE-PHASE LOCOMOTIVES 345 Motors are of the three-phase slip-ring, -S-pole type. Each is rated bythe Italian Westinghouse engineers at nearly 1000 h. p. for 1 hour or720 h. p
. Electric traction for railway trains; a book for students, electrical and mechanical engineers, superintendents of motive power and others .. . nnecting motor is entirely spring mounted, on four spiral springs, twoon each side of the motor axle boxes. The motors are slipped intoplace, in their outer frames, from below. A motor can be removed intwo hours. Two motors weigh 27 tons. See Figure 50. DESCRIPTION OF THREE-PHASE LOCOMOTIVES 345 Motors are of the three-phase slip-ring, -S-pole type. Each is rated bythe Italian Westinghouse engineers at nearly 1000 h. p. for 1 hour or720 h. p. continuous on forced draft, based on 75° C. rise, determined byresistance measurements. Motors have partly closed slots for protectionof windings in the rotor and stator. These slots are filled with a flexibleinsulating compound (which at times gets into the air gap). Control is by means of the concatenated scheme. The rotor or second-ary of the first motor delivers a very low voltage to the primary of thesecond motor. The secondary of the second motor is then connectedto a compressed-air-controlled water rheostat, the gradual change in. Fig. 120.—Italian State Railway.—Giovi and 440-ton train on per cent, grade. which provides smooth acceleration. In order to change from parallel toconcatenated connections or to reverse the direction of motor, a small3000-volt, air-break switch is used to open the main circuit. Changeis then made in the contact mechanism or connections, so that arcingdoes not occur at the controller contacts. Multiple control is arranged, yet the current in any one motor islimited and locomotives with widely different wheel diameters and loadsare used together. The pushing locomotive can then carry the larger load,as is frequently desirable. The current to a locomotive is limited by theaddition of resistance, automatically inserted in the secondary of themotor by the action of induction regulators, relays, and compressed airwhich ch
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Keywords: ., bookcentury1900, bookdecade1910, bookidelec, booksubjectrailroads
