Electro-dynamics: The Direct-current MotorLongmans Green and Company, 1898 - 298 páginas |
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Página 15
... speed varied , the tension corresponding to each speed being observed and plotted in the figure . There was no current in the armature . The points found lie on straight lines passing through the origin , showing that the induction ...
... speed varied , the tension corresponding to each speed being observed and plotted in the figure . There was no current in the armature . The points found lie on straight lines passing through the origin , showing that the induction ...
Página 17
... speed method . If the values of M are plotted on a base of current in the magnets , we get a curve that we shall call the induction curve . ' Fig . 8 gives the induction curve of the arc light dynamo already described , obtained by ...
... speed method . If the values of M are plotted on a base of current in the magnets , we get a curve that we shall call the induction curve . ' Fig . 8 gives the induction curve of the arc light dynamo already described , obtained by ...
Página 30
... speed is neither 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 ...
... speed is neither 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 ...
Página 32
... speed is nothing , the mechanical watts is nothing , and the torque has its maximum value . On the other hand , at the point D the speed is a maximum and the torque is nothing . Hence the mechanical watts increases from nothing to some ...
... speed is nothing , the mechanical watts is nothing , and the torque has its maximum value . On the other hand , at the point D the speed is a maximum and the torque is nothing . Hence the mechanical watts increases from nothing to some ...
Página 33
... speed when the load is fixed . If we put Mn for e in Equation . 12 , n being the revolutions per second , we get n = E - CR M . ( 13 ) . from which we see that when E , R and M are fixed , the speed depends only upon c ; but e depends ...
... speed when the load is fixed . If we put Mn for e in Equation . 12 , n being the revolutions per second , we get n = E - CR M . ( 13 ) . from which we see that when E , R and M are fixed , the speed depends only upon c ; but e depends ...
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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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