. 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. —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
. 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. —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 Pig. 1,433.—Fort Wayne alternator with direct connected exciter mounted on the field shaftat such distance as to permit a pedestal and bearing to be mounted between the exciterand revolving field. In the view, the bearing is hidden by the exciter, only the foot of thepedestal being visible. Ques. What are the advantages of gear driven ex-citers? Ans. Being geared to run at high speed, they are smallerand therefore less costly than direct connected exciters. In large 1 172 KINS ELECTRICITY plants containing a number of alternators one exciter may beused having sufficient capacity to excite all the alternators, andwhich can be located at any convenient place. Que>. What is the disadvantage of gear driven exciters? . be space t it ■ i cue eear
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