Electro-dynamics: The Direct-current MotorLongmans Green and Company, 1898 - 298 páginas |
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Página 8
... increased without having any current in the armature ; this will be explained later on , but we may state briefly that a definite torque is required to turn a mass of iron in a magnetic field , the amount of the torque depending on the ...
... increased without having any current in the armature ; this will be explained later on , but we may state briefly that a definite torque is required to turn a mass of iron in a magnetic field , the amount of the torque depending on the ...
Página 10
... increased when the magnets were ex- cited , showing that the hysteresis torque was inappreciable . The induction factor is obtained from Equation 5 . After the experiment a current of 78 amperes was passed through the armature , and a ...
... increased when the magnets were ex- cited , showing that the hysteresis torque was inappreciable . The induction factor is obtained from Equation 5 . After the experiment a current of 78 amperes was passed through the armature , and a ...
Página 19
... increased . Experiments were made on the arc light dynamo , previously described , to ascertain the amount of the reduc- tion of M due to this cause . The current in the magnets was kept constant at 9 amperes , and the armature current ...
... increased . Experiments were made on the arc light dynamo , previously described , to ascertain the amount of the reduc- tion of M due to this cause . The current in the magnets was kept constant at 9 amperes , and the armature current ...
Página 30
... increasing nor decreasing , the torque due to the current must exactly balance that due to the load , for if it were greater or less than this there would be a torque available either for acceleration or retardation . It follows that ...
... increasing nor decreasing , the torque due to the current must exactly balance that due to the load , for if it were greater or less than this there would be a torque available either for acceleration or retardation . It follows that ...
Página 32
... increases from nothing to some maximum and then decreases to nothing again , the speed increasing as the torque decreases , The mechanical watts is a maximum when DK = KB ( not necessarily when DKFG is a square ) , i.e. when the current ...
... increases from nothing to some maximum and then decreases to nothing again , the speed increasing as the torque decreases , The mechanical watts is a maximum when DK = KB ( not necessarily when DKFG is a square ) , i.e. when the current ...
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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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