Electro-dynamics: The Direct-current MotorLongmans Green and Company, 1898 - 298 páginas |
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Página 2
... magnets are in the same direction . Hence the forces acting on the conductors constitute a couple . If lines of force A force f brush -Current down O Current up brush force f lines of force FIG . 1 any number of conductors are arranged ...
... magnets are in the same direction . Hence the forces acting on the conductors constitute a couple . If lines of force A force f brush -Current down O Current up brush force f lines of force FIG . 1 any number of conductors are arranged ...
Página 8
... magnets or armature . This is due to the friction of the bearings and brushes ; we may assume it to be constant throughout the experiment . On exciting the magnets we shall generally find that the pull is slightly increased without ...
... magnets or armature . This is due to the friction of the bearings and brushes ; we may assume it to be constant throughout the experiment . On exciting the magnets we shall generally find that the pull is slightly increased without ...
Página 9
... magnet circuit and the current kept constant during the test . The induction factor obtained will be that for this particular current in the magnets ; if this current is altered , a different induction factor will be obtained . The ...
... magnet circuit and the current kept constant during the test . The induction factor obtained will be that for this particular current in the magnets ; if this current is altered , a different induction factor will be obtained . The ...
Página 10
... magnets was kept constant at 4.5 amperes . The leverage was 30 inches . A pull of 1.4 pounds due to friction was observed with no current in magnets or armature ; this was not increased when the magnets were ex- cited , showing that the ...
... magnets was kept constant at 4.5 amperes . The leverage was 30 inches . A pull of 1.4 pounds due to friction was observed with no current in magnets or armature ; this was not increased when the magnets were ex- cited , showing that the ...
Página 12
... magnets are as 100 , 159 , and 178 . The corresponding values of N as obtained by a method to be presently described are 1.05 x 106 , 1.68 x 106 , and 1.89 × 106 . Amperes 6 Amperes " 7 6 5 4 3 2 3 Amperes MAGNETISATION CURVES FOR ARC ...
... magnets are as 100 , 159 , and 178 . The corresponding values of N as obtained by a method to be presently described are 1.05 x 106 , 1.68 x 106 , and 1.89 × 106 . Amperes 6 Amperes " 7 6 5 4 3 2 3 Amperes MAGNETISATION CURVES FOR ARC ...
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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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