Electro-dynamics: The Direct-current MotorLongmans Green and Company, 1898 - 298 páginas |
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Página 55
... miles per hour . We have assumed that the whole resistance to motion can be represented by a force of T pounds acting at the rim of the driving wheel . This resistance may for con- venience be divided into frictional and gravitational ...
... miles per hour . We have assumed that the whole resistance to motion can be represented by a force of T pounds acting at the rim of the driving wheel . This resistance may for con- venience be divided into frictional and gravitational ...
Página 56
... miles an hour while exerting a force of 3,600 pounds at the draw bar . Two motors are to be used , connected in parallel and geared to the shafts of the driving wheels with velocity ratio of 4.78 . The driving wheels are to be 33 inches ...
... miles an hour while exerting a force of 3,600 pounds at the draw bar . Two motors are to be used , connected in parallel and geared to the shafts of the driving wheels with velocity ratio of 4.78 . The driving wheels are to be 33 inches ...
Página 99
... miles an hour . The torque and speed curves of this motor , as obtained from actual test , are given in Fig . 21. The circles indicate observations . The resistance of the magnets and armature in series , when hot , was 1.245 ohms ...
... miles an hour . The torque and speed curves of this motor , as obtained from actual test , are given in Fig . 21. The circles indicate observations . The resistance of the magnets and armature in series , when hot , was 1.245 ohms ...
Página 101
... miles . In order to run at fifteen miles an hour up such a grade with a seven - 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 ...
... miles . In order to run at fifteen miles an hour up such a grade with a seven - 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 ...
Página 118
... MILES 151 16 of the car in miles per hour on 33 -. 400 Z 300 NOIS N3 200 100 1200 POUNDS / 55 AMPERES 1000 47 800 40 25 300 200 THE SPEED AND USEFUL TRACTIVE EFFORT AT DIFFERENT TENSIONS FOR ONE G. E. 800 RAILWAY MOTOR . 400 300 200 100 ...
... MILES 151 16 of the car in miles per hour on 33 -. 400 Z 300 NOIS N3 200 100 1200 POUNDS / 55 AMPERES 1000 47 800 40 25 300 200 THE SPEED AND USEFUL TRACTIVE EFFORT AT DIFFERENT TENSIONS FOR ONE G. E. 800 RAILWAY MOTOR . 400 300 200 100 ...
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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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