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 90
of the commutator are firmlypressed together. A groove is then turned therein, andclamping rings of corresponding shape are fitted. These 78 DYNAMO ELECTRIC MACHINERY. are then bolted on, and the steel rings removed, leavinga completed commutator, such as shown in section inFig. 46. Considerable… … Fig. 45. Fig. 46. To secure successful operation a commutator must bedesigned with a sufficient number of bars, so that thedifference of potential between two adjacent bars shallnot exceed 10 volts. This would mean that a lOO-voltbipolar machine should have at least 20 bars. The poten-tial between…
Electric machinery
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