Electro-dynamics: The Direct-current MotorLongmans Green and Company, 1898 - 298 páginas |
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Página 49
... wheel , to the number of teeth in the toothed wheel on the motor shaft , which we shall call the pinion . The following table gives the numbers of teeth in gear wheel and pinion with the corresponding velocity ratios often used in ...
... wheel , to the number of teeth in the toothed wheel on the motor shaft , which we shall call the pinion . The following table gives the numbers of teeth in gear wheel and pinion with the corresponding velocity ratios often used in ...
Página 50
... Wheel . in Pinion . Ratio . 62 22 2.82 67 17 3.94 69 15 4.60 67 14 4.78 In many cases it is convenient to be able to express M in terms of the torque on the shaft to which the motor is geared . If t is the torque in inch - pounds on the ...
... Wheel . in Pinion . Ratio . 62 22 2.82 67 17 3.94 69 15 4.60 67 14 4.78 In many cases it is convenient to be able to express M in terms of the torque on the shaft to which the motor is geared . If t is the torque in inch - pounds on the ...
Página 52
... wheel of diameter d inches , the whole resistance to be overcome can be represented by an equivalent force of T pounds at the circumference of the driving wheel , and we may then та substitute for t , the torque on the main shaft . 2 as ...
... wheel of diameter d inches , the whole resistance to be overcome can be represented by an equivalent force of T pounds at the circumference of the driving wheel , and we may then та substitute for t , the torque on the main shaft . 2 as ...
Página 54
... wheel . Since p , the point of contact between the wheel and the rail , is at rest at any instant , the moment of the force T acting at p , taken about the centre of the wheel , is equal to the moment of a force F acting at the centre ...
... wheel . Since p , the point of contact between the wheel and the rail , is at rest at any instant , the moment of the force T acting at p , taken about the centre of the wheel , is equal to the moment of a force F acting at the centre ...
Página 55
... wheel of diameter d inches , E being the tension of the line , and R the resistance of the motor ; we have M = Ed 11.2vS 1+ 7.96RTS E2 ...... ... ( 21 ) . where S is now the velocity of the centre of the driving wheel , expressed in ...
... wheel of diameter d inches , E being the tension of the line , and R the resistance of the motor ; we have M = Ed 11.2vS 1+ 7.96RTS E2 ...... ... ( 21 ) . where S is now the velocity of the centre of the driving wheel , expressed in ...
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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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