. The Street railway journal . ed, is rated at thirtyhorse power, and is designed to exert a horizontal effort or drawbarpull of 1000 lbs. continously, without heating or sparking at thebrushes. The frame is of low carbon, cast steel, insuring maximumpower for minimum weight, and the bearings for both axle andarmature are contained in the same casting, insuring perfect align-ment. The frame is parted through the center and suspended so asto remove the armature from below. The top and bottom of themotor frame are also separable and contain the upper and lowerpole pieces, to which are securely a
. The Street railway journal . ed, is rated at thirtyhorse power, and is designed to exert a horizontal effort or drawbarpull of 1000 lbs. continously, without heating or sparking at thebrushes. The frame is of low carbon, cast steel, insuring maximumpower for minimum weight, and the bearings for both axle andarmature are contained in the same casting, insuring perfect align-ment. The frame is parted through the center and suspended so asto remove the armature from below. The top and bottom of themotor frame are also separable and contain the upper and lowerpole pieces, to which are securely attached the field coils, makingit possible to remove either without disturbing any other part of themotor. The armature core is of the drum type, is built up of thin disksof Sweedes iron, with soft steel heads, and is pierced with holesparallel with the shaft for ventilation. The shaft is of hammeredsteel, 3^s ins. in diameter, and provided with tapered seat for bothcommutator and pinion. The bearings are of large diameter and. D:ECEmber, 1896.] STREET RAILWAY JOURNAL. 783 jijreat length, insuring cool running. Flanges or collars are keyedto the shaft and run in the open spaces between the motor frameand bearings. These prevent end motion of the armature and an extra safeguard to prevent oil or moisture from entering themotor frame. They are easily removed and replaced. The armature winding consists of machine wound coils,thoroughly by a special compound and a double layer ofinsulating material. The slots of core are also lined with troughsof special insulating material which ensures their easy removal nomatter how long in service. The coils are laid in the slots ofcore, well below the surface. The balance of the slot is filled witha hard wood strip, and the whole securely bound with Germansilver wire. The heads of armature are covered with canvas, thoroughlyvarnished to exclude moisture and dust, and a brass ventilatedshield is placed on the head opposite t
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
