. 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, 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,
. 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, 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 isso easily obtained by belt drive, that form of transmission isgenerally used for high speed alternators, the chief objection. Fig. ; — and the angle of tkva. machine tun being the space required. Accordingly where economy of spaceis not of prime importance, a high speed alternator is usuallyinstalled, except in the large sizes where the conditions naturallysuggest a direct connected unit. An example of high speed alternator is shown in fig. 1,438. Machinesof this class run at speeds of 1,300 to 1,800 or more, according to size. No one would think of connecting an alternator running at any suchspeed direct to an engine, the necessary speed reduction proper forengine operation being easily obtained by means of a belt drive. ALTERNA TORS 1,177 No one would think of connecting an alternator running at suchspeeds direct to an engine, the necessary speed reduction proper forengine operation being easily obtained by means of a belt drive. Water Wheel Alternators.—In order to meet
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