Electrical news and engineering . he generator forcooling purposes. Inside, there are heavy axial or crossribs, the inner surfaces of which are machined and havedovetail slots for holding the armature punchings cut inthem. The cross ribs are braced by circumferential ribsuniformly spaced along the cross ribs. Due to the largesize of the frame for this machine, it was found advantage-ous to divide it into a number of parts arranged for boltingtogether to form the complete unit. By the first division, a sulated from the punchings. Fig. 2 illustrates the assemblyof the frame and armature core, on
Electrical news and engineering . he generator forcooling purposes. Inside, there are heavy axial or crossribs, the inner surfaces of which are machined and havedovetail slots for holding the armature punchings cut inthem. The cross ribs are braced by circumferential ribsuniformly spaced along the cross ribs. Due to the largesize of the frame for this machine, it was found advantage-ous to divide it into a number of parts arranged for boltingtogether to form the complete unit. By the first division, a sulated from the punchings. Fig. 2 illustrates the assemblyof the frame and armature core, one quarter section beingremoved. The armature winding of this generator consists of alarge number of coils formed to shape and thoroughly in-sulated for insertion into the slots in the core. Bare copperstrap rectangular in section, is used in making the coils,there being a number of straps used to make up each con-ductor. After the coils are formed to shape, the individualstraps and also the groups of straps forming the conductors. Fig 2—Internal view ofArmature Core of first generator with onequarter section removed—Queenston Plant Hydro-clcc-tric Power Commission ofOntario, lower and an upper frame are provided. The lower framerests on the bedplate and carries the lower bearing bracketwith the lower guide bearing. This part of the frame isdivided radially into two equal parts. The upper frame issupported by the lower frame and holds in it the armaturecore and windings while on top it carries the upper bearingbracket which in turn supports the exciter, the upper guidebearing and the thrust bearing. This part of the frame isdivided radially into four equal parts, the joints being madein the centres of cross ribs to facilitate belting the sectionstogether. Some conception as to the magnitude of thisframe may be had from the fact that the approximate di-mensions of each section of the upper frame are 10 feet and 19 feet in length, while the weight nf each
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