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3-phase motor 3-phase system alternate-current motors alternating currents alternating-current applied electromotive force armature current armature reaction Atkinson average Ballsbridge Blackrock Board of Trade brushes car-mile cars cent class of motor coils conductors connected continuous current continuous-current motor continuous-current system copper Dalkey diagram Dublin earth return effect efficiency Electric Tramway electromotive force due energy engine excited frequency full load Geipel give given hysteresis inducing winding induction motor Inst kilowatts loss machine magnetic circuit magnetic field magnetic flux magnetic leakage magnetic systems maximum miles motive force motor-car motor-generator number of poles obtained output Paper Parshall Parshall's period phase difference phase relations power factor practically pressure producing rails resistance result revolutions per minute rheostat right angles rotary converter rotary transformers rotation running secondary current shaft shown in Fig shows slots square centimetre square inch starting station sub-stations supply synchronous motors torque traction trailer-cars transformer transmission turning-moment voltage volts
Page 23 - Class 4.—Inductive motors without brushes, having shortcircuited coils, and two reciprocal inductive electric and magnetic axes. As this class of motor is the most important and widely used, its properties and functions may be more fully considered. An idealized motor, Fig. 40, will first be considered, where A, B are
Page 24 - X sin 6 . . . (8) where 6 is the angle between the plane of the coil and the magnetic axis. The average value of the virtual electromotive force
Page 63 - that the maximum fall of potential shall not exceed 7 volts, and to allow for overlapping of loads, such as is liable to occur in a system of twenty-five cars, it was assumed that the maximum would exceed the average by 50 per cent., and that the average fall in the earth