. The Street railway journal . FIGS. AND 2U.—METHOD OF MOUNTING MOTOR ON WFIEEL The high-tension current is carried to the stator. The wind-ing of the rotor is so dimensioned that its induced current hasa tension of only 300 volts. The starting and variation of thespeed is consequently performed with a circuit of 300 volts only. It will be remembered that the number of revolutions ofthree-phase motors is a constant, depending upon the periodi-city and the number of poles of the motor. However, if wehave two motors we can secure an efficient half-speed byleading the induced current from the rot
. The Street railway journal . FIGS. AND 2U.—METHOD OF MOUNTING MOTOR ON WFIEEL The high-tension current is carried to the stator. The wind-ing of the rotor is so dimensioned that its induced current hasa tension of only 300 volts. The starting and variation of thespeed is consequently performed with a circuit of 300 volts only. It will be remembered that the number of revolutions ofthree-phase motors is a constant, depending upon the periodi-city and the number of poles of the motor. However, if wehave two motors we can secure an efficient half-speed byleading the induced current from the rotary part of one motor. A = Trolley. B — Lightning arrester. C = Controller. D — Switch for primary circuit. K = Short-circuiting M2 = High-te,nsion ] = Low-tension — Water rheostat. T = Transformer for heaters, lighting circuit and air = Fuse box. FIG. 27.—DIAGRAM OF CONNECTIONS OF MOTOR CAR in llie air valve and raise the trolley. To avoid this the heen so devised that tlie key cannot be withdrawn when theiloor is o])cn. MOTORS \.;\vh truck carries one high-tension and une luvv-tcnsionmulor, the stator of which is connected to the truck and sus-])cnde(l by springs, while the rotor is connected to the drivingwlieels by means of a linked coupling. This cou]iling, shownin ligs. 25 and 26, allows a certain ;iuii)iuU uf independentmovement to the car axle, while the angular speed uf the wheels to the stator of the other. Fig. 27 shows the plan of the con-nections of a car. The connecting and disconnecting of thesetwo motors is performed by a starting
Size: 2362px × 1058px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
