Electro-dynamics: The Direct-current MotorLongmans Green and Company, 1898 - 298 páginas |
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Página 101
... ton car , we should need about four horse - power for friction and track resistance , and eleven for the grade . On the descending journey , we should have to take current from the line only when starting up after a stop ; for the rest ...
... ton car , we should need about four horse - power for friction and track resistance , and eleven for the grade . On the descending journey , we should have to take current from the line only when starting up after a stop ; for the rest ...
Página 140
... tons , the tension of the line being 500 volts . The other curve shows the efficiency when the two motors are connected in series on the same tension . Equation 58 shows that the series curve has been carried too high in the figure ...
... tons , the tension of the line being 500 volts . The other curve shows the efficiency when the two motors are connected in series on the same tension . Equation 58 shows that the series curve has been carried too high in the figure ...
Página 156
... tons is given by a = 32.2 T 1 T ' - 2240 W 69.5 W . ( 81 ) . If the centre of gravity of this mass rotate in a circle of d inches diameter , and if the motion is derived from a motor with a velocity ratio of v , we have Mv T = 2.82 -Ca ...
... tons is given by a = 32.2 T 1 T ' - 2240 W 69.5 W . ( 81 ) . If the centre of gravity of this mass rotate in a circle of d inches diameter , and if the motion is derived from a motor with a velocity ratio of v , we have Mv T = 2.82 -Ca ...
Página 162
... tons . A starting rheostat is used , and when this is all ont , the motors are left to speed up in series . The maximum current per motor , and hence from the line , will be taken as 150 amperes . The induction curve for these motors is ...
... tons . A starting rheostat is used , and when this is all ont , the motors are left to speed up in series . The maximum current per motor , and hence from the line , will be taken as 150 amperes . The induction curve for these motors is ...
Página 164
... tons , this corresponds to a tractive effort of 19.7 pounds per ton on wheels of 33 inches diameter . Construct a curve B giving torque available for accelera- tion , by deducting from the horizontal ordinates of curve A an amount equal ...
... tons , this corresponds to a tractive effort of 19.7 pounds per ton on wheels of 33 inches diameter . Construct a curve B giving torque available for accelera- tion , by deducting from the horizontal ordinates of curve A an amount equal ...
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Términos y frases comunes
accelerating current acceleration curve amperes armature B.Sc brushes cent centimetres CHEMISTRY circuit College connected in series constant Crown 8vo current curve current per motor Diagrams diameter difference distance travelled dynamo ELECTRICITY ELEMENTARY 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 gives greater Hence horizontal horse-power hysteresis Illustrations inch-pounds increase induced tension induction curve induction factor line watts lines of force load London machine magnetic circuit 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 rotation running Science series-wound motor speed curve Suppose surface conductors terminal tension tion tons torque curve torque loss total current total torque tractive effort velocity ratio volts weight Woodcuts
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