An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 237
143(6) gives a diagramof the electric and magnetic circuits of a four-pole generator.By increasing the number of poles we can get the commercialvoltages (110, 220, or 500 volts) at much slower speeds thanwould be necessary in bipolar machines. Since the voltagedepends on the rate at which the wires… … Fig. 143. — Four-pole generator (a) and its diagrammatic cross section (&). machine. For this reason the speed of a four-pole machine isone half the speed required in a two-pole machine for the samevoltage. Furthermore, the multipolar machine is more eco-nomical to build, because it requires…
Electricity · Magnetism
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