. The Street railway journal . MAIN CAR HOUSE spider is made of high quality cast iron, the hub being providedwith flange for bolting to engine fly-wheel, and is pressed onto the shaft by hydraulic pressure and key seated. The pole-pieces are made of laminated steel and are held to-gether between two cast-steel end plates. The upper part isT-shaped for holding the field coils in position; the lower part of the pole-pieces is dovetailed for fixing on the rim of therotor, where it is held in position by means of keys. The re-moval of the field coils is effected by sliding the pole-piece fromthe
. The Street railway journal . MAIN CAR HOUSE spider is made of high quality cast iron, the hub being providedwith flange for bolting to engine fly-wheel, and is pressed onto the shaft by hydraulic pressure and key seated. The pole-pieces are made of laminated steel and are held to-gether between two cast-steel end plates. The upper part isT-shaped for holding the field coils in position; the lower part of the pole-pieces is dovetailed for fixing on the rim of therotor, where it is held in position by means of keys. The re-moval of the field coils is effected by sliding the pole-piece fromthe dovetailed groove parallel to the shaft, without disturbing. CENTER-POLE CONSTRUCTION any other part of the machine. The design and shape of thepole-pieces give a distribution of lines of forces in the air gapto produce an approximately sinusoidal shaped wave of electro-motive force. The exciter is mounted on the extension of thealternator shaft. The stator frame is built in two halves,bolted together by means of finished bolts. The coils are former wound, and are embedded in rectangu-lar slots, being held in position by wooden wedges, and areeasily and quickly replaced; they are protected outside the lam-inations by means of a cast-iron shield, cast in sections, boltedto the frame, and easily removable. This shield is of a per-forated design, and does not in any way interfere with the ven-tilation. The switchboard was built by Dick, Kerr & Company,and consists of seven enameled slate panels, each supported in-dependently on an iron frame. The board consists of threegenerator panels, one power panel and three H. T. feederpanels. The sub-sta
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
