. The Street railway journal . hod,where the circulation of air was stopped by solid pole pieces. Thefield coils themsehes are of copper wire insulated with asbestospaper and cotton covering. The completed coil is waterproofed. Fig. 5 shows the finished armature, which weighs, complete, 484lbs. The armature core discs are stamped with forty-one slotsin their edges and five ^entilating holes around the shaft. Half-inch ventilating spaces are left at intervals between the core discsby inserting special spacing discs. The commutator, which is1T ins. in diameter, contains 123 hard-drawn copper bar
. The Street railway journal . hod,where the circulation of air was stopped by solid pole pieces. Thefield coils themsehes are of copper wire insulated with asbestospaper and cotton covering. The completed coil is waterproofed. Fig. 5 shows the finished armature, which weighs, complete, 484lbs. The armature core discs are stamped with forty-one slotsin their edges and five ^entilating holes around the shaft. Half-inch ventilating spaces are left at intervals between the core discsby inserting special spacing discs. The commutator, which is1T ins. in diameter, contains 123 hard-drawn copper bars 4 It has a wearing face of 3 ins. and a maximum wearing OCTOEKR 5, 1901;.] STREET RAILWAY JOURNAL. 507 depth of I in. SiKer amlx-r mica is used for insulation. Theinsulation of the finished connnutator is tested with 2000 voltsalternating current between the segments and the hub, and with500 \olts between adjacent bars. As shown in the illustratidu,\entilating s]iaces are leH in the c()niniutati)r hub hir the admis-. FIG. 7.—DETAILS OF BEARINGS sion of eodl air which subseciuently passes out through the l)od\of the armature. Each armature slot contains three coils, making 4iX3 = i-,3commutator l>ars. The brush holders are illustrated in Fig. 6. These holders aresupported on a hardwood frame, and are adjusted radially (that respect to the commutator), or lengthwise of the shaft for the
Size: 1955px × 1278px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, bookidstreetrailwa, bookyear1884
