. 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. 1,550.—Three phase winding with short coils. The use of short coils as here shown, inwhich the coil breadth = J£ pole pitch, avoids the necessity of overlapping. 1 248 IIA UK INS E LECTRICITY In polyphase working, it is evident that by the use of four equalindependent windings on the armature, connected to eight rings, a two phase alternato
. 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. 1,550.—Three phase winding with short coils. The use of short coils as here shown, inwhich the coil breadth = J£ pole pitch, avoids the necessity of overlapping. 1 248 IIA UK INS E LECTRICITY In polyphase working, it is evident that by the use of four equalindependent windings on the armature, connected to eight rings, a two phase alternator can be built to supply cum:equal voltage to four independent circuits. Libthree equal independent windings, connected to six terminals or sliprings, a three phase alternator can be made to supply three inde-pendent circuits. This is not the usual method employed in either case, however, a?the star grouping or mesh grouping methods of connection not only. Fig. —Radial diagram of three phase lap winding with star connection. gives the same results, but also, in star grouping, a greater plurality ofvoltages for the same machine, and a higher voltage between its mainterminals. ial diagrams of the arrangement and connt :ping of lap windings and wave windings for three phase alternators arcshown by figs, 1,551 and 1 CONSTRUCTION OF ALTERNATORS 1,249 Ones. In three phase star grouping, what is the pointwhere the phases join, called? Ans. The star point. Ques. In a three phase star connected alternatorwhat is the voltage between any two collector rings? Ans. It is equal to the voltags generated per phase multipliedby V3 or
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