. 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. , slow speed alternators direct connected to highspeed —fr****- The alternator is styled slow speed although connected to a high speed«mni- bwnn1 what is considered high engine speed is slow speed for alternator alternators have direct connected exciters which are plainly seen in the illustrationH~~< on an extension of bearing pedestal. Dir
. 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. , slow speed alternators direct connected to highspeed —fr****- The alternator is styled slow speed although connected to a high speed«mni- bwnn1 what is considered high engine speed is slow speed for alternator alternators have direct connected exciters which are plainly seen in the illustrationH~~< on an extension of bearing pedestal. Direct connected exciters on units of this landdo not, as a rale, assume too bulky proportions, because of the high engine speed. Fly Wheel Alternators.—The diameter of the revolvingfields on direct connected alternators of very large sizes becomesso great that considerable fly wheel effect is obtained, althoughthe revolutions be low. By giving liberal thickness to the rim ALTERNATORS 1,175 of the spider, the rotor then answers the purpose of a fly wheel,hence no separate fly wheel is required. In fact, the revolvingelement resembles very closely an ordinary fly wheel with mag-nets mounted on its rim, as illustrated in fig. 1, Fig, 1,437.—General Electric 48 pole 750 kw., three phase fly wheel type alternator. It runsat a speed of 150 revolutions per minute, giving a frequency of 60 cycles per second anda full load pressure of 2,300 volts. The slip rings and leads to the field winding areclearly shown in the figure. The field magnets are mounted directly on the rim of thespider, which resembles very closely a fly wheel, and which in fact it is—hence the namefly wheel alternator.!! 1,176 HAWKINS ELECTRICITY High Speed Alternators.—Since alternators may be run atspeeds far in excess of desirable engine speeds, it must be evidentthat both size and cost may be reduced by designing themfor high speed operation. Since the desired velocity ratio or multiplication of speed
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