. 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. 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
. 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. 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. race is required, but for belts,rt be considerable distance between ; : i^:.-:~::i: Slow Speed Alternators.—By slow speed is here understoodrelat: v speed, such as the usual speeds of reciprocating engines. A slow speed alternator is one designed to run at aspeed slow enough that it may be direct connected to an engine. ALTERNATORS 1,173 Such alternators are of the revolving field type and a little con-sideration will show that they must have a multiplicity of fieldmagnets to attain the required frequency. In order that there be room for the magnets, the machineevidently must be of large size, especially for high frequency.
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