. Electrical world. been successful and in this country but two orthree varieties are seen. The possibilities of connections with differ-ent armature windings has been thoroughly worked out, principallyby E. .Arnold, and equations for many possible arrangements havebeen given. When the conditions for commutation are consideredonly the simplest types of windings are practicable. Parallel andseries or lap and wave windings are the only ones which give satis-factory results. European makers still employ combinations ofthese, but in this country such exceptions are seldom found. Chordand pitch arr
. Electrical world. been successful and in this country but two orthree varieties are seen. The possibilities of connections with differ-ent armature windings has been thoroughly worked out, principallyby E. .Arnold, and equations for many possible arrangements havebeen given. When the conditions for commutation are consideredonly the simplest types of windings are practicable. Parallel andseries or lap and wave windings are the only ones which give satis-factory results. European makers still employ combinations ofthese, but in this country such exceptions are seldom found. Chordand pitch arrangements of coils arc used, dependent upon manu- of bars between brushes, large diameters, short lengths, small sec-tions, etc. DIRECT-CURRENT GENERATORS. The form of field magnet has undergone great change. The two-pole wrought-iron structure has been changed to almost every pos-sible shape by different makers. The greater economy in use of ma-terial in multipolar types for large sizes has resulted in the standard. 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
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
