. Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise. Pic — -en coveredinsulating compound, the pans that fie are preascd to exact siae in steam- heated rr. the insulating material into all the small spaces in the coil. _ iirg moisture and rendering the insolation firm and sohd. The ends of the coils,where they project beyond the aloes, i CONSTRUCTION OF ALTERNATORS 1,223 the distribution of the magnetic
. Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise. Pic — -en coveredinsulating compound, the pans that fie are preascd to exact siae in steam- heated rr. the insulating material into all the small spaces in the coil. _ iirg moisture and rendering the insolation firm and sohd. The ends of the coils,where they project beyond the aloes, i CONSTRUCTION OF ALTERNATORS 1,223 the distribution of the magnetic flux follows a sine law, and that thewhole of the loops of active inductors in the armature circuit actssimultaneously, that is to say, the winding is concentrated. In practice, the coils are often more or less distributed, thatis, they do not always subtend an exact pole pitch; moreover, theflux distribution, which depends on the shaping and breadth. Fig. 1505.—Allis Chalmers armature construction; view showing section of frame and twolayer winding. of the poles, is often quite different from a sine , the coefficient in equation (2) is often departed from,and in the general case equation (2) may be written E virt io8 (3) 1 224 IIA WKINS ELECTRICITY
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