Electro-dynamics: The Direct-current MotorLongmans Green and Company, 1898 - 298 páginas |
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Página 30
... illustration we may take the case of a railway motor driving a loaded car . Suppose that the tension . of the line falls from 500 to 200 volts . Since the current depends on the load , which is unaltered by the decrease of the tension ...
... illustration we may take the case of a railway motor driving a loaded car . Suppose that the tension . of the line falls from 500 to 200 volts . Since the current depends on the load , which is unaltered by the decrease of the tension ...
Página 82
... illustrated in the diagram the speed at this point is 626 r.p.m. , ca is 48 amperes , c , is 72 amperes , the total current is 120 amperes , and the combined torque 812 inch - pounds . When the total torque is less than that given by ...
... illustrated in the diagram the speed at this point is 626 r.p.m. , ca is 48 amperes , c , is 72 amperes , the total current is 120 amperes , and the combined torque 812 inch - pounds . When the total torque is less than that given by ...
Página 83
... illustrated in Fig . 18. Since the resistances of the two dynamos are 1 · 2 and 1.09 , and their induction factors 6 and 4 , we have to run the combination at 1,452 r.p.m. to make the current from the line nothing ; the current in each ...
... illustrated in Fig . 18. Since the resistances of the two dynamos are 1 · 2 and 1.09 , and their induction factors 6 and 4 , we have to run the combination at 1,452 r.p.m. to make the current from the line nothing ; the current in each ...
Página 99
... illustration the G. E. 800 railway motor made by the General Electric Company , and designed to exert a horizontal effort of 800 pounds on 33- inch wheels , when running at 9.4 miles an hour . The torque and speed curves of this motor ...
... illustration the G. E. 800 railway motor made by the General Electric Company , and designed to exert a horizontal effort of 800 pounds on 33- inch wheels , when running at 9.4 miles an hour . The torque and speed curves of this motor ...
Página 112
... curves of torque and current , both on a speed base , of the motor illustrated in Fig . 20. The curves represent the following conditions . ( 1 ) When the I 1000 900 W 700 PER INCH LBS OF TORQUE 112 CH . V THE DIRECT - CURRENT MOTOR.
... curves of torque and current , both on a speed base , of the motor illustrated in Fig . 20. The curves represent the following conditions . ( 1 ) When the I 1000 900 W 700 PER INCH LBS OF TORQUE 112 CH . V THE DIRECT - CURRENT MOTOR.
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Términos y frases comunes
45 amperes accelerating current acceleration curve amperes armature B.Sc brushes cent centimetres CHEMISTRY circuit College Crown 8vo current curve current per motor Diagrams diameter difference distance travelled driving wheel dynamo ELECTRICITY Engineers equal Example expenditure of energy f.p.s. per second feet per second final speed find the induction foot-pounds force factor frictional torque full speed gearing given distance gives greater Hence horizontal horse-power hysteresis Illustrations inch-pounds increase induced tension induction curve induction factor line watts lines of force lines per pole load machine magnets main shaft maximum current mechanical efficiency mechanical watts miles an hour motor shaft obtained pole-tip pounds railway motor reduced represent resistance to motion revolutions per minute revolutions per second rheostat running series-wound motor speed curve starting rheostat Suppose surface conductors terminal tension tion tons torque curve torque loss total torque tractive effort velocity ratio volts weight Woodcuts
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