Dynamo electric machinery; its design, construction, and operation; direct-current machines (1915)
Sheldon, Samuel, 1862-1920, Hausmann, Erich, 1886- joint author · New York, D. Van Nostrand Company; · leaf 89
ationmust be provided between the segments and the spiderupon which they are mounted and the clamping ringswhich hold them in position, because the potential differ-ences at these places are the same as the terminal voltage ARMATURES. 77 of the machine. The usual thicknesses of mica requiredfor… … Fig. 44. When the commutator segments and mica strips areassembled in place, a pair of temporary steel rings is placedaround them, the inner one being split into a number ofsections, as shown in Fig. 45. The screws are tightenedso that the component parts of the commutator are firmlypressed…
Electric machinery
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