. 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. Fig. —Three phase, 10 pole, 30 slot winding in two ranges. In this winding perfectsymmetry occurs after every four poles. Accordingly in the case of an odd number ofpairs of pole, one of the coils must necessarily be askew going from the inner to the outerrange as at M. Each of the three individual windings must be concentratedinto narrow belts so as
. 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. Fig. —Three phase, 10 pole, 30 slot winding in two ranges. In this winding perfectsymmetry occurs after every four poles. Accordingly in the case of an odd number ofpairs of pole, one of the coils must necessarily be askew going from the inner to the outerrange as at M. Each of the three individual windings must be concentratedinto narrow belts so as to leave sufficient space for the otherwindings between them. This limits the breadth or spaceoccupied by the winding of any one phase to one-third of thepole pitch. phase a. Fig. 1,539.—Three phase 10 pole 30 slot winding in three ranges. The coils of each phase arealike, those of the A phase being all in the straight out range, those in the B phase, in abent up range, and those in the C phase in a bent down range. This arrangement has thedisadvantage, that by reason of the third range, the field magnet cannot be treatment of the coil ends is more clearly shown in fig. 1,540. Ques. How are three phase coil ends treated? Ans. They may be arranged in two ranges, as in fig. 1,538,.or in three ranges, as in fig. 1,539. :- TRICITY Ques. What kind of coil must be used for three phasewindings in order that the ends may be arranged in onlytwo ranges? Hemitropic or half coils; that is, the number of coilper phase must be equal to one-half the number of pole.
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