. Electrical world. FIG. 2. — ,^.700-KW GENERATOR. facturers. type of machine and subdivision of winding. When out-puts began to exceed a few hundred kilowatts, the series windingbecame impossible and parallel windings have needed equalizingrings. The use of these is general and is very satisfactory. Moderndesigning is characterized by subdivision of reaction and heat gen-eration, so we have small conductors, with but few in a slot, manypoles, smallest possible number of turns per coil, maximum numbers. FIG. 3.—REVOLVING-FIELD GENERATOR WITH DIRECT-CONNECTED EX-CITER, BUILT IN FRANCE ABOUT 188
. Electrical world. FIG. 2. — ,^.700-KW GENERATOR. facturers. type of machine and subdivision of winding. When out-puts began to exceed a few hundred kilowatts, the series windingbecame impossible and parallel windings have needed equalizingrings. The use of these is general and is very satisfactory. Moderndesigning is characterized by subdivision of reaction and heat gen-eration, so we have small conductors, with but few in a slot, manypoles, smallest possible number of turns per coil, maximum numbers. FIG. 3.—REVOLVING-FIELD GENERATOR WITH DIRECT-CONNECTED EX-CITER, BUILT IN FRANCE ABOUT 1880. form of to-day. Curiously enough, some English manufacturersstill cling to the old bipolar construction for large Wrought iron was at first almost exclusively used for was followed by combination circuits of which cast iron formeda part. The art of casting steel is of recent development and hashad a wide application. The best steel castings are now magneticallyequal to wrought iron. The critical saturation point of steel, itsgreater conductivity for eddy currents set up by a varying , thedisparity between necessary sections for magnetic and mechanicalreasons with large diameters, some uncertainty with regard to itsmanufacture and a lack of magnetic retentiveness and stability havecaused some manufacturers to substitute cast iron for its use for fieldyokes, while for pole cores it is still employed. Rectangular lami-nated poles cast into iron yokes are also used. Ex
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
