. The Street railway journal . f flat field coils are wound of copper strap, insulated between turnswith treated asbestos ribbon, and then carefully taped and givenrepeated dippings in specially prepared insulating compoundsand varnishes, which make them moisture repelling and ableto stand internal heat. Brass hangers hold the coils in placeindependently of the poles. The armature core is built up of steel punchings keyed on acast-steel spider, which also carries the commutator. Theshaft is forced into the finished armature and keyed thereto,and may be removed, should necessity ari
. The Street railway journal . f flat field coils are wound of copper strap, insulated between turnswith treated asbestos ribbon, and then carefully taped and givenrepeated dippings in specially prepared insulating compoundsand varnishes, which make them moisture repelling and ableto stand internal heat. Brass hangers hold the coils in placeindependently of the poles. The armature core is built up of steel punchings keyed on acast-steel spider, which also carries the commutator. Theshaft is forced into the finished armature and keyed thereto,and may be removed, should necessity arise, without disturbingthe windings or commutator. The armature coils are strapwound and made in two parts. As the top coils are more liable September 23, 1905.] STREET RAILWAY JOURNAL. to injury, this design makes it possible to remove the damagedpart without disturbing any other part of the winding. Thecoils are liberally insulated with mica and sealed, and furtherinsulated by dipping in varnishes which are oilproof and mois-. 100 151AMPERES 200 250 Street Railway Journal CURVES OF 85-HP MOTOR lure repelling. On each end the armature slots are made deeperand wider, thereby providing space for mica cells, whichgreatly reinforce the insulation at these points. As a further 300 «0 30 200 -Jo 20 \ 200 ry. motor RaJtIO 19 1: 64 3 500 VOLTS WHEELS c< INTINU JUS CA AC1TY E NTIREL CLOSEOPEN D 135 A176 MP. AT 360 V EFFIC ENCV « ITHOUT GEARS APPROX . EFF. WITH G LARS 4 w \-* V // \° Y° Yc w <$\ Wcf— 20 C. R SF FRO * 75 C. 200 300AMPERES 400 500 Strait RttUnnu M CURVES OF 200-HP MOTOR protection, fibre strips are taped to the upper sides of the topcoils. A bell-shaped flange at the pinion end and a cylindricalflange on the commutator end form rigid supports for thewindings. Countersunk bands of steel wire on the core andwide bands outside the core hold the coils firmly and securely. Openings through the spider and core allow a free passage ofair, which is th
Size: 1512px × 1653px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
