. 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. Figs. 1,448 and 1,449.—Westinghouse laminated hub and laminated pole piece for revolvingfield having squirrel cage winding. Thin steel is used for the laminations of both huband pole piece; these are assembled and firmly riveted together under hydraulic pressureThe laminations are of the same thickness in both hub and 1 ISO) 1 162 Triumph pole
. 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. Figs. 1,448 and 1,449.—Westinghouse laminated hub and laminated pole piece for revolvingfield having squirrel cage winding. Thin steel is used for the laminations of both huband pole piece; these are assembled and firmly riveted together under hydraulic pressureThe laminations are of the same thickness in both hub and 1 ISO) 1 162 Triumph pole pieces. These consist oi laminated punching? securely clamj« •: 1 end plates. The laminations are with polar hori. shown, and which serve to keep the field coils securely wedged in position. In some designs the horns are separate. The two holes in each pole pi<& through boha which secure the pole piece and c- lerrun. Dovetail joints are sometimes used instead of through bolts, as in figs. 1,448 and 1,449. CONSTRUCTION OF ALTERNATORS 1,189 1. Self-excited; 2. Separately excited; 3. Compositely excited. Ques. What is a self-excited alternator? Ans. One in which the field magnets are excited by currentfrom one or more of the armature coils, or from a separate winding(small in comparison with the main winding), the current beingtransformed into direct current by passing it through a com-mutator.
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