. 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. • m—Treatment of coil en Is in two phase, two range windings. In this arrange-ment straight out Hi an.! >ils are used which are placed on the arma-ture as is clearly shown in the illustration. CONSTRUCTION OF ALTERNATORS 1,241 surface of the armature at intervals equal to one-third and two-thirds, respectively, of the double pole pitch, the unit in terms
. 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. • m—Treatment of coil en Is in two phase, two range windings. In this arrange-ment straight out Hi an.! >ils are used which are placed on the arma-ture as is clearly shown in the illustration. CONSTRUCTION OF ALTERNATORS 1,241 surface of the armature at intervals equal to one-third and two-thirds, respectively, of the double pole pitch, the unit in terms ofwhich the spacing is expressed, being that pitch, which corre-sponds to one whole period. PHASE A. 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
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