An elementary book on electricity and magnetism and their applications . Fig. 241 a. — Shaft with rotating field and exciter armature. Note gridsacross pole Fig. 241 b. — Small alternator with exciter (ri>dit) coupled to the shaft. ALTERNATING-CURRENT GENERATORS 353 240. Exciters. In the earlier types of alternators the directcurrent for exciting the field coils was furnished by a littled-c. generator connected with the alternator by a belt. Butin recent yesirs the exciter has been either directly connectedon the same shaft, as shown in figure 241, or has been drivenindependently. S
An elementary book on electricity and magnetism and their applications . Fig. 241 a. — Shaft with rotating field and exciter armature. Note gridsacross pole Fig. 241 b. — Small alternator with exciter (ri>dit) coupled to the shaft. ALTERNATING-CURRENT GENERATORS 353 240. Exciters. In the earlier types of alternators the directcurrent for exciting the field coils was furnished by a littled-c. generator connected with the alternator by a belt. Butin recent yesirs the exciter has been either directly connectedon the same shaft, as shown in figure 241, or has been drivenindependently. Separately-driven exciters are more common,because of the fact that this system is much more flexible,since any drop in the speed of the alternator does not cause acorresponding drop in the exciter voltage. Then, too, if theexciter is not direct-connected, an accident to it will not neces-sitate shutting down the alternator, provided there is a dupli-cate exciter set. Sometimes a storage battery is installed inconnection with the exciting generators, so that current maybe furnished to the field circuits of the alternators even thoughall other rotating appar
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmagnetism, bookyear19
