Electro-dynamics: The Direct-current MotorLongmans Green and Company, 1898 - 298 páginas |
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Página 8
... amount of the torque depending on the quality of the iron , the intensity of the field , and the volume of iron turned ; if the current exciting the magnets be kept constant , this torque , which we shall call the hysteresis torque ...
... amount of the torque depending on the quality of the iron , the intensity of the field , and the volume of iron turned ; if the current exciting the magnets be kept constant , this torque , which we shall call the hysteresis torque ...
Página 15
... amount CR volts , where C is the current and R the resistance of the armature from brush to brush . The product CR is called the heat drop . ' Hence to find M when a current is passing , we must measure C ; knowing R , we can add the ...
... amount CR volts , where C is the current and R the resistance of the armature from brush to brush . The product CR is called the heat drop . ' Hence to find M when a current is passing , we must measure C ; knowing R , we can add the ...
Página 18
... amount of this diminution depends very largely upon the form of the pole pieces . In some machines where the value of the induction factor 400 300 200 Z INCH 100 500 POUNDS 1000 900 TORQUE is practically constant for all currents in the ...
... amount of this diminution depends very largely upon the form of the pole pieces . In some machines where the value of the induction factor 400 300 200 Z INCH 100 500 POUNDS 1000 900 TORQUE is practically constant for all currents in the ...
Página 19
... 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 from nothing to 10 amperes . The induction factor was observed by the torque method . 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 from nothing to 10 amperes . The induction factor was observed by the torque method . The ...
Página 29
... amount the armature cannot move ; if it is less than this the difference is available for acceleration , and the motor will speed up until the torque due to the current is equal to that due to CH . II 29 CONDITIONS OF UNIFORM MOTION.
... amount the armature cannot move ; if it is less than this the difference is available for acceleration , and the motor will speed up until the torque due to the current is equal to that due to CH . II 29 CONDITIONS OF UNIFORM MOTION.
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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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