. The Street railway journal . st revolve to drive the carforward. Let it be further assumed that for an instantO A equals the active torque of the stator, thenit will be easily understood that O B, whichequals O A, represents the reactive torque ofthe rotor exerted on the car axle, meaning thatif the car is free to move the reactive torquecan be used advantageously for the starting andTRUCK acceleration of the car. When the car is standing in a station it isheld at rest by moving the controller to such a position that theoutlet pipe from rotor cylinder R C is throttled, thereby in-creasing th
. The Street railway journal . st revolve to drive the carforward. Let it be further assumed that for an instantO A equals the active torque of the stator, thenit will be easily understood that O B, whichequals O A, represents the reactive torque ofthe rotor exerted on the car axle, meaning thatif the car is free to move the reactive torquecan be used advantageously for the starting andTRUCK acceleration of the car. When the car is standing in a station it isheld at rest by moving the controller to such a position that theoutlet pipe from rotor cylinder R C is throttled, thereby in-creasing the pressure behind the piston to such an extent thatit overcomes the effort of the rotor R to revolve, thus tendingto cause the stator S to revolve and at the same time holds thecar at rest without the use of wheel brakes. 2.—STARTING AND ACCELERATION To start the car the air cushion behind the piston of R C isremoved, and the air, which is being compressed by cylinderS C, supplemented by the stored air from the tanks, is ad-. January 2, 1904.] STREET RAILWAY JOURNAL. 45 mitted to cylinder R C, with the controller at the position ofmaximum cut-off. The rotor then begins to revolve, and as itaccelerates the stator slows down by exactly the same amountthat the rotor has increased its speed, and as the rotor and carspeed increase the controller is gradually moved to a smallerpercentage of cut-off, until the car speed corresponds to the fullsynchronous speed of the motor, atwhich time the stator comes to rest. During this period of accelerationthe air compressed by cylinder S C,instead of being delivered to thetanks to lose its heat, is delivered,hot, directly to the rotor cylinders,thus greatly increasing the efficiencyof the combination, as the heatusually lost in air systems is utilized,and the advantages of heated airgained without a reheater, and as thepressure used is low many of theordinary difficulties in the use of com-pressed air disappear. If the rate ofacceleration is
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
