. The Street railway journal . r in their construction,because of their extreme simplicity in design and the very few partswhich constitute a complete machine, as may be seen in Fig. i. The magnet frame is circular in form and is made of a specialquality of cast iron, haviiig a very high magnetic permeabilit\ is provided with inwardly projecting pule pieces, and is tlivideilhorizontally so that half of the frame can Ije removed for the in-spection or removal of the armature. The lower half of the frameis provided with two large feet, to insure a firm footing upon thefoundation girders. The
. The Street railway journal . r in their construction,because of their extreme simplicity in design and the very few partswhich constitute a complete machine, as may be seen in Fig. i. The magnet frame is circular in form and is made of a specialquality of cast iron, haviiig a very high magnetic permeabilit\ is provided with inwardly projecting pule pieces, and is tlivideilhorizontally so that half of the frame can Ije removed for the in-spection or removal of the armature. The lower half of the frameis provided with two large feet, to insure a firm footing upon thefoundation girders. The poles. Fig. 2, are made of the finestquality of laminated steel, cast into the magnet frame with a cast-welded joint, thus insuring a very low reluctance in the magneticcircuit. They are also provided with detachable pole shoes, whichact as keepers or supports for the field magnet spools. .Testpieces are taken from every frame casting, and submitted to themost careful test, to determine its magnetic qualities; the sheet steel. FIG. I.—STANDARD GENERATOR which is used in making laminated pole pieces is also submittedto the same test, and any material which does not come up to therequired standard is rejected. The field coils are wound upon spools made of steel, with lirassends, one portion of the spool being occupied by the shunt wind-ing, which consists of double cotton-covered copper wire of 100per cent conductivity. The other portion of the spool contains thescries winding of ribbon copper, there being only one turn perlayer, insulated most thordughly with mica and cloth. The shunt coils and the series coils are insulated from each otherby a combination of mica and red rope paper, and both coils areinsulated from the spool by at least % in. of the same the winding is completed the surface of the coil is carefullycovered with a heavy paper wrapping, secured with a layer ofbraided rope covering, filled with insulating varnish. The finishedcoils are placed in
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Keywords: ., bookcentury1800, bookdecade1880, bookidstreetrailwa, bookyear1884
