Electro-dynamics: The Direct-current MotorLongmans Green and Company, 1898 - 298 páginas |
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Página 10
... volts , 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 ...
... volts , 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 13
... volts , so that if each conductor were separate from dt all the other conductors , we should observe a reading of dn10-8 volts on a voltmeter connected to the ends of dt any one conductor , dn depending upon the position of the ...
... volts , so that if each conductor were separate from dt all the other conductors , we should observe a reading of dn10-8 volts on a voltmeter connected to the ends of dt any one conductor , dn depending upon the position of the ...
Página 14
... volts divided by the number of revolutions per second . We must not however suppose that because M is thus defined ... volt- 14 CH . I THE DIRECT - CURRENT MOTOR.
... volts divided by the number of revolutions per second . We must not however suppose that because M is thus defined ... volt- 14 CH . I THE DIRECT - CURRENT MOTOR.
Página 15
... 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 product 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 product CR ...
Página 16
... VOLTS 600 700 500 400 300 200 INDUCED 100 100 600 REVOLUTIONS PER 1000 FIG . 7 5 10 FIG . 8 40 50 20 INDUCTION 30- 10 60 70 FACTOR OU 600 400 > 500 VOLTS 300 200 00 ICO INDUCED 700 shaft when a current of 300 amperes is passed through.
... VOLTS 600 700 500 400 300 200 INDUCED 100 100 600 REVOLUTIONS PER 1000 FIG . 7 5 10 FIG . 8 40 50 20 INDUCTION 30- 10 60 70 FACTOR OU 600 400 > 500 VOLTS 300 200 00 ICO INDUCED 700 shaft when a current of 300 amperes is passed through.
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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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