Electro-dynamics: The Direct-current MotorLongmans Green and Company, 1898 - 298 páginas |
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Página 19
... decreases from 70 to 63 . The experiment made on the Edison 12 K.W. dynamo and plotted in Fig . 4 shows no change in the value of M due to this cause . This matter will be discussed in greater detail in a later chapter under the name of ...
... decreases from 70 to 63 . The experiment made on the Edison 12 K.W. dynamo and plotted in Fig . 4 shows no change in the value of M due to this cause . This matter will be discussed in greater detail in a later chapter under the name of ...
Página 30
... decreasing , the torque due to the current must exactly balance that due to the load , for if it were greater or less ... decrease of the tension , the motor will take the same current at 200 volts as it did at 500 volts . In Fig . 10 ...
... decreasing , the torque due to the current must exactly balance that due to the load , for if it were greater or less ... decrease of the tension , the motor will take the same current at 200 volts as it did at 500 volts . In Fig . 10 ...
Página 32
... decreases to nothing again , the speed increasing as the torque decreases . The mechanical watts is a maximum when DK = KB ( not necessarily when DKFG is a square ) , i.e. when the current is half DB , the area of DKFG is then seen to ...
... decreases to nothing again , the speed increasing as the torque decreases . The mechanical watts is a maximum when DK = KB ( not necessarily when DKFG is a square ) , i.e. when the current is half DB , the area of DKFG is then seen to ...
Página 35
... Decrease the load and observe the diminished . current required for a balance . 3. Keep the load constant , and diminish the resistance ; note ( a ) the temporary increase of current ; ( b ) the direction of rotation , say clockwise ...
... Decrease the load and observe the diminished . current required for a balance . 3. Keep the load constant , and diminish the resistance ; note ( a ) the temporary increase of current ; ( b ) the direction of rotation , say clockwise ...
Página 43
... decreases again to nothing at b , showing that when the dynamo is acting as a motor the rate of doing work is a maximum when the current is E equal to 2R Fleming's rules for determining the direction of the force on a conductor and of ...
... decreases again to nothing at b , showing that when the dynamo is acting as a motor the rate of doing work is a maximum when the current is E equal to 2R Fleming's rules for determining the direction of the force on a conductor and of ...
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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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