Electrical machinery; a practical study course on installation, operation and maintenance (1921)
Annett, Fred Anzley · New York [etc.] McGraw-Hill book company · leaf 185
e brushes. Furthermore, all fibers orpapers are subjected to more or less contraction and expansiondue to moisture conditions. This eventually led to slight loose-ness between the bars and insulation, so that oil or copper and 168 ELECTRICAL MACHINERY carbon dust could penetrate and cause pitting… … Pio. 182 A Fig. 183 Figs. ISO to 183.—Types of commutators. will fill the .space between the bars irrespective of the expan-sion and contraction of the commutator. So far, mica seemsto po&se.ss these Icquirements to a greater extent than anvthinelse. The story of commutalor insulation is one of…
Electric machinery
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