. 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. e armature core was built up of steel ribbon 2 inches wide and 3 milsthick. The armature had 400 slots with one wire per slot, and a bore ofabout 25 inches. The air gap was only inch. On constant ex-citation the voltage dropped from 150 volts at no-load to 123 volts withan output of 8 amperes. Self-Exciting Image Current Alternators.—The type of mac
. 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. e armature core was built up of steel ribbon 2 inches wide and 3 milsthick. The armature had 400 slots with one wire per slot, and a bore ofabout 25 inches. The air gap was only inch. On constant ex-citation the voltage dropped from 150 volts at no-load to 123 volts withan output of 8 amperes. Self-Exciting Image Current Alternators.—The type of machinedescribed in the preceding paragraph can be made self-exciting byconnecting each pair of brushes, which collect the current from thearmature, with a field coil so located that the flux it produces will bedisplaced by a pre-determined angle depending on the number of phasesrequired, as shownby fig. 1,447. The direction of the residual mag-netism of the machine is shown by the arrows A, A. • HAWKIXS ELECTRICITY ■ generated brushy _ -. and a current will flow from C through the coils XX :o B, prod residual magnetism and <. mt magne. D, B, and D, C. -ashes -uch a directionopposed I .ual magnetism, and afterward. _■_:--—-- . current alternator. residual magnet-ism becon machine will be due I will produce a resultant polar li:ill recur .. will become continuous. The negor gap of the machine will cut the coneU be cut by the conduct rotor in such a l-s generated :will be equal and opposite to those between the terminals CONSTRUCTION OF ALTERNATORS 1,187 CHAPTER L CONSTRUCTION OF ALTERNATORS The construction of alternators follows much the same linesas dynamos, especially in the case of machines of the revolvingarmature type. Usually, however, more poles are provided thanon direct current machines, in order to obtain the required fre-quency without being driven at excessive speed. The essential parts of an alternator are: 1. Field magnets; 2. Armature; 3. C
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