Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 382
certain frequency. The standard frequencies today are60 and 25 in this country. For 60 cycles, the number of poles mul-tiplied by the speed in revolutions per minute must equal 7200,while for 25 cycles their product must always equal 3000. In belted alternators the speeds usually fall between 1800… … Fig. 119. Engine-Driven, Revolving-Field, Alternating-Current GeneratorCourtesy of Allis-Chalmcrs Manufacturing Company alternators, or alternators that are direct driven by steam turbines,run from 3600 to 500 r. p. m., and have from 2 to 12 poles. Classifications. Alternators may be divided into…
Electrical engineering
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