. 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. 1,431.—Frame, bed plate and armature winding for Westinghouse bracket bearing poly«phase alternator. Ques. How is a direct connected exciter arranged? Ans. The exciter armature is mounted on the shaft of thealternator close to the spider huh, or in some cases at a distancesufficient to permit a pedestal and bearing to be mounted be-tween the exciter an
. 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. 1,431.—Frame, bed plate and armature winding for Westinghouse bracket bearing poly«phase alternator. Ques. How is a direct connected exciter arranged? Ans. The exciter armature is mounted on the shaft of thealternator close to the spider huh, or in some cases at a distancesufficient to permit a pedestal and bearing to be mounted be-tween the exciter and hub. In other designs the exciter isplaced between the bearing and hub. 1,170 HAWKINS ELECTRICITY Figs. 1,432 and 1,433 are examples of direct connected exciter alter-nators, in fig. 1,432 the exciter being placed between the field huband bearing, and in fig. 1,431, beyond the bearing. Ques. What is the advantage of a direct connectedexciter? Ans. Economy of space. This is apparent by comparing figs. 1,432 and 1,433 with fig. 1which shows a belted Fig. —General Electric alternator with direct connected exciter mounted on shaft between field hub and bearing. In the smaller sizes, the magnet frame is bolted to the Icet, but in the larger sizes special construction is used depending upon the met. The exciters are capable of furnishing the desired excitation for low • Ques. What is the disadvantage of a direct connectedexciter? Ans. It must run at the same speed as the alternator, whichis slower than desirable, hence the exciter must be larger for a ALTERNA TORS 1,171 given output than the gear driven type, because the latter can berun at high speed and accordingly be made proportionallysmaller. Ques. What form of gear is generally used on geardriven exciters? Ans. Belt gear.
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