Small, Sidney Aylmer, 1876- [from old catalog] · Chicago, F. J. Drake & co · leaf 377
running very slowly, or the armature may be re-moved and the commutator turned down in a lathe. Flat spots, or flats sometimes occur in a commutator,usually caused by excessive wear or by a loose bar in thecommutator. At times a bad short-circuit may producea flash that will start a flat. After… … Fig. 176. Westinghouse Rotary Converter Armature from the CollectorSide, 300 K. W., 550 Volts, Three-Phase. Trouble in commutators is sometimes caused- by theburning out of the mica insulation between bars. Thismay be due to several causes, the most common of whichis oil-soaked mica or loose…
Electricity
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