. Electric traction and transmission engineering . The induction motor is practically a constant-speed motor, the speed variation being less than aboutten per cent of the no-load value, and therefore causeslarge energy demands on the central station. On the otherhand, energy may be returned to the system when trainsoperated by them descend grades. This type of motoris adapted for heavy traction with infrequent stops. Twoor three separate trolleys are necessary for such oper-ation. Fig. 19 shows the motors and the method of theirmountings on the trucks on the locomotives used in the TYPES AND P
. Electric traction and transmission engineering . The induction motor is practically a constant-speed motor, the speed variation being less than aboutten per cent of the no-load value, and therefore causeslarge energy demands on the central station. On the otherhand, energy may be returned to the system when trainsoperated by them descend grades. This type of motoris adapted for heavy traction with infrequent stops. Twoor three separate trolleys are necessary for such oper-ation. Fig. 19 shows the motors and the method of theirmountings on the trucks on the locomotives used in the TYPES AND PERFORMANCE CURVES OF MOTORS. 41 Cascade tunnel of the Great Northern Railroad. Sixthousand six hundred volts are dehvered to the locomotivesfrom two trolley wires and the track rails, and are steppeddown by transformers in the cab to 500 volts, which areimpressed upon the motor terminals. 16. Methods of Drive. — Traction motors may drivethe car wheels by means of gears, connecting rods, ordriving pins. The first method is universally employed. Fig 20 on street railways, the speed being reduced by a pinionon the motor shaft meshing with a gear wheel on the wheelshaft. Fig. 20 shows two geared G. , 200 horse-power direct-current motors mounted upon a truck, asused on the West Jersey and Seashore Railroad. The lattermethods of drive are used in high-speed locomotive the Pennsylvania electric locomotives the motors aremounted upon the frame and side-connected to drivingwheels by a system of cranks and parallel connecting rods, TRACTION AND TRANSMISSION.
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