Electro-dynamics: The Direct-current MotorLongmans Green and Company, 1898 - 298 páginas |
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Página 64
The Direct-current Motor Charles Ashley Carus-Wilson. the speed increases with the induction factor ; ob = 271Rt at b the speed ... final value E Ꭱ ; the safety fuses would of course prevent so large a current from passing . The values of ...
The Direct-current Motor Charles Ashley Carus-Wilson. the speed increases with the induction factor ; ob = 271Rt at b the speed ... final value E Ꭱ ; the safety fuses would of course prevent so large a current from passing . The values of ...
Página 149
... final speed of the M motor when it has ceased to accelerate . then get - n = n , + Ke KM R t If this is n ,, we . ( 67 ) . To find the value of the constant K , we know that when t = o , n is the initial speed , if we call this n ,, and ...
... final speed of the M motor when it has ceased to accelerate . then get - n = n , + Ke KM R t If this is n ,, we . ( 67 ) . To find the value of the constant K , we know that when t = o , n is the initial speed , if we call this n ,, and ...
Página 150
... final speed n , by a quantity which is itself a fraction of that final speed , the value of the fraction depending on the time and on a certain constant T. The act of switching on the motor really amounts to changing the tension on the ...
... final speed n , by a quantity which is itself a fraction of that final speed , the value of the fraction depending on the time and on a certain constant T. The act of switching on the motor really amounts to changing the tension on the ...
Página 151
The Direct-current Motor Charles Ashley Carus-Wilson. than the final speed by an amount given by the equation . Equation 69 may be regarded still more generally . We have seen that the speed of a motor is given by E - CR and that an ...
The Direct-current Motor Charles Ashley Carus-Wilson. than the final speed by an amount given by the equation . Equation 69 may be regarded still more generally . We have seen that the speed of a motor is given by E - CR and that an ...
Página 152
... final speed divided by the time factor . If the initial speed is not zero we have from Equation 69 dn ans = dt T e t t - т or n nf т e T .. ( 72 ) . Thus when anything occurs to change the speed from nyn This n , to n ,, the initial ...
... final speed divided by the time factor . If the initial speed is not zero we have from Equation 69 dn ans = dt T e t t - т or n nf т e T .. ( 72 ) . Thus when anything occurs to change the speed from nyn This n , to n ,, the initial ...
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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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