. Electrical world. FIG. I.—.ARMATURE. reannealed after being punched, and then coated with an insulatingcompound. They are built up directly on the shaft and providedwith ventilating openings parallel to the shaft through which air canpass to ventilating ducts between the discs and outer ribbed flange,thus providing thorough ventilation through the entire core andwindings. The winding consists of form-wound coils, the smallerarmatures being wound with round wire and the larger ones with flatcopper strip; the coils are independently insulated, dipped in a specialinsulating compound and thoroug
. Electrical world. FIG. I.—.ARMATURE. reannealed after being punched, and then coated with an insulatingcompound. They are built up directly on the shaft and providedwith ventilating openings parallel to the shaft through which air canpass to ventilating ducts between the discs and outer ribbed flange,thus providing thorough ventilation through the entire core andwindings. The winding consists of form-wound coils, the smallerarmatures being wound with round wire and the larger ones with flatcopper strip; the coils are independently insulated, dipped in a specialinsulating compound and thoroughly baked before being put in placeon the armature core, where they are retained in the slots by surfaceband?. The cnnimutators are made from rolled copper bars insulated. 2 .AND 3.—UNIVERS.\L MOTORS. from each other by the best grade of amber mica segments. Thesegments are of unusual length and depth, allowing an ample marginfor wear and insuring cool and sparkless commutation. The flangesare of cast iron, insulated from the segments with solid V commutators are easily removed from the armature shaft. Exceptional care has been used in the design of the mechanicalfeatures, as rigid construction is an important factor in the satisfac-tory performance of this part of the machine. The brush holders areclamped on the stems close up to the point of brush contact, thebrushes being of composition graphite and carbon, and fed towardthe commutator through a milled trough in the face of the brushes are held firmly against the face plate by means of a flatphosphor-bronze spring, brush tension being provided by means of afinger actuated by an adjustable spring. The holder is very simple indesign, aside from being reliable in its operat
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
