Electro-dynamics: The Direct-current MotorLongmans Green and Company, 1898 - 298 páginas |
Otras ediciones - Ver todas
Términos y frases comunes
100 amperes 45 amperes accelerating current acceleration curve armature axis brushes cent centimetres connected in series current curve current per motor diagram diameter difference distance travelled driving wheel dynamo eddy current electrical 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 increase induced tension induction curve line watts lines of force lines per pole load machine magnetic circuit MAGNETISATION CURVES main shaft maximum current mechanical efficiency mechanical watts miles an hour moment of inertia motor shaft obtained pole-tip pounds railway motor reduced represent resistance to motion revolutions per minute revolutions per second running series-wound motor speed curve starting rheostat Suppose surface conductors terminal tension tion tons torque curve torque loss total current total torque tractive effort velocity ratio volts weight
Pasajes populares
Página 25 - ... heat are those of molecules, and are so numerous, so small individually, and so irregular in their distribution, that they quite escape all our methods of observation ; whereas when the motions and displacements are those of visible bodies consisting of great numbers of molecules moving all together, the communication of energy is called work. Hence we have only to suppose our senses sharpened to such a degree that we could trace the motions of molecules as easily as we now trace those of large...
Página 25 - ... acted on by forces having potentials. The second law relates to that kind of communication of energy which we call the transfer of heat as distinguished from another kind of communication of energy which we call work. According to the molecular theory the only difference between these two kinds of communication of energy is that the motions and displacements which are concerned in the communication of heat are those of molecules, and are so numerous, so small individually, and so irregular in...
Página 248 - Gerry, and may be found in a paper published in the Proceedings of the American Institute of Electrical Engineers for 1897. The rolling stock consists of motor cars and passenger cars. The former measure 47 feet in length, and weigh 62,000 pounds when fullly loaded. They are mounted on locomotive trucks, with driving wheels 33 inches in diameter, the velocity ratio being 3* 18. One truck of each motor car is equipped with two motors. The passenger cars are 47 feet in length, having trucks fitted...
Página 89 - ... of two electric-motors coupled in such a way as to admit of their rotating at different speeds. The two shafts are placed in line, and each is fitted with a bevel-wheel, gearing into an intermediate wheel. The axis of the intermediate wheel is at right angles to the line of the motor-shafts, and is free to rotate in a plane at right angles to that line. The motors can be made to rotate at different speeds by altering the strength of the magnets of either or both. The motion of the intermediate...
Página 266 - Fig. 7; point the forefinger in the direction of the lines of force, the thumb in the direction of the motion of the wire, then the middle finger will point in the direction of the induced emf 11.