. The Street railway journal . FIG. GENERAL VIEW OF ALTERNATOR FIG. -LAMINATED POLE PIECES run entirely by water power, turbines of the Stilwell-Bierce &Smith-Vaile type being employed. A general view of the typeof generators to be installed is shown in Fig. I. The generators have stationary armatures and rotating machine has thirty poles on its field magnet and can deliver375 at 240 The field magnet poles are all salient, eachcarrying a coil, as shown in the general view. The constructionof the field magnet is as follows: A massive cast-iron hub is pro-vided with rotat
. The Street railway journal . FIG. GENERAL VIEW OF ALTERNATOR FIG. -LAMINATED POLE PIECES run entirely by water power, turbines of the Stilwell-Bierce &Smith-Vaile type being employed. A general view of the typeof generators to be installed is shown in Fig. I. The generators have stationary armatures and rotating machine has thirty poles on its field magnet and can deliver375 at 240 The field magnet poles are all salient, eachcarrying a coil, as shown in the general view. The constructionof the field magnet is as follows: A massive cast-iron hub is pro-vided with rotating arms. This hub is divided on a diameter, andthe two halves strongly bolted together. Two finished hub cast-ings are shown in Fig. 5 and it will be seen that the armsare not connected together by a continuous rim. In this way. FIG. 2.—SHOWING CONSTRUCTION OF ARMATURE RING there is no danger of strain from expansion or contraction, suchas might obtain if the rim was continuous. Mounted upon theends of the arms are massive steel rings, which form a surfaceon which to mount the pole pieces, and also a return magnet cir-cuit for them. These rings, which are very strong, aresecurely bolted to the cast-iron arms of the hub, and to them thepole pieces are secured also by Dolts. The pole piece has a T-shaped section and is constructed of rather thick laminae of iron,which are tightly compressed together and securely riveted, enab- The vertical division of the frame serves to hold the laminae inplace. These are exceptionally large stampings of iron, deeplynotched at proper intervals to receive the coils of the laminae in sizes up to and even exceeding 100 , consistof but a single piece for a half circumference. They are stackedtogether with the slots coincident and with suitable separatorplates
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
