Electro-dynamics: The Direct-current MotorLongmans Green and Company, 1898 - 298 páginas |
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Página 19
... to this cause . This matter will be discussed in greater detail in a later chapter under the name of Armature Reaction . CHAPTER II CONDITIONS OF UNIFORM MOTION WHEN a conducting circuit c 2 CH . I 19 THE INDUCTION FACTOR.
... to this cause . This matter will be discussed in greater detail in a later chapter under the name of Armature Reaction . CHAPTER II CONDITIONS OF UNIFORM MOTION WHEN a conducting circuit c 2 CH . I 19 THE INDUCTION FACTOR.
Página 29
... greater than the resisting torque , there will be a surplus available for acceleration . Take the case of a locomotive pulling a train ; if the horizontal effort of the locomotive at the draw - bar is greater than the frictional ...
... greater than the resisting torque , there will be a surplus available for acceleration . Take the case of a locomotive pulling a train ; if the horizontal effort of the locomotive at the draw - bar is greater than the frictional ...
Página 30
... greater or less than this there would be a torque available either for acceleration or retardation . It follows that for uniform motion the current is determined by the load , and is given by Equation 5 , where t is the torque due to ...
... greater or less than this there would be a torque available either for acceleration or retardation . It follows that for uniform motion the current is determined by the load , and is given by Equation 5 , where t is the torque due to ...
Página 33
... ; the speed is thus 351 r.p.m. The maximum possible speed for no load is 750 r.p.m. From Equation 13 we see that when cR is negative D and greater than E , n is negative , i.e. CH . II 33 CONDITIONS OF UNIFORM MOTION.
... ; the speed is thus 351 r.p.m. The maximum possible speed for no load is 750 r.p.m. From Equation 13 we see that when cR is negative D and greater than E , n is negative , i.e. CH . II 33 CONDITIONS OF UNIFORM MOTION.
Página 34
... greater current E flowing than that given by c = R It is important to notice that the direction of rotation is reversed only when the current is greater than E R ; this shows that we can reverse the motion of a dynamo by EM putting on a ...
... greater current E flowing than that given by c = R It is important to notice that the direction of rotation is reversed only when the current is greater than E R ; this shows that we can reverse the motion of a dynamo by EM putting on a ...
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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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