Electro-dynamics: The Direct-current MotorLongmans Green and Company, 1898 - 298 páginas |
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Página 10
... running at 1,500 revolu- tions per minute . The conductors are laid on the surface of the iron core . The torque is plotted on a base of amperes in the armature . The current in the magnets was kept constant at 4.5 amperes . The ...
... running at 1,500 revolu- tions per minute . The conductors are laid on the surface of the iron core . The torque is plotted on a base of amperes in the armature . The current in the magnets was kept constant at 4.5 amperes . The ...
Página 17
... running at 440 r.p.m. The tension on the brushes is 550 volts when the machine is delivering 400 amperes . The internal resistance of the armature is 0 · 0375 ohm . What is the pull on the belt due to the current in the armature if the ...
... running at 440 r.p.m. The tension on the brushes is 550 volts when the machine is delivering 400 amperes . The internal resistance of the armature is 0 · 0375 ohm . What is the pull on the belt due to the current in the armature if the ...
Página 22
... runs at 1,500 revolutions per minute , and has a current of 70 amperes passing in the armature . The induced tension is 100 volts , so that the rate of working is 7,000 watts . Nothing is here stated as to whether the dynamo is , acting ...
... runs at 1,500 revolutions per minute , and has a current of 70 amperes passing in the armature . The induced tension is 100 volts , so that the rate of working is 7,000 watts . Nothing is here stated as to whether the dynamo is , acting ...
Página 33
... run at a speed given by dividing the tension of the line by the induction factor ; this is there- fore the maximum possible speed of a motor . If cR = E , n is nothing . This is simply a different way of stating the fact that if the ...
... run at a speed given by dividing the tension of the line by the induction factor ; this is there- fore the maximum possible speed of a motor . If cR = E , n is nothing . This is simply a different way of stating the fact that if the ...
Página 36
... run at the maximum speed DO . In practice , it would be impossible to reduce the load on a motor to nothing , since there is always some load due to friction of bearings and brushes . We might , however , reduce the load absolutely to ...
... run at the maximum speed DO . In practice , it would be impossible to reduce the load on a motor to nothing , since there is always some load due to friction of bearings and brushes . We might , however , reduce the load absolutely to ...
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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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