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 133
ry poles between the main field polesof dynamos is also effective in reducing armature reaction.The coils on the auxiliary poles are connected in serieswith the armature, and the entire current, or a definite partof it, traverses the auxiliary winding. This arrangementyields perfect commutation at… … Fig. 76. 55. Commutation.—The electromotive force induced inthe armature conductors of practically all direct-currentgenerators is alternating, and in order to obtain a unidirec-tional E.M.F. at the terminals of the machine it is necessaryto reverse the connections at the moment the induced…
Electric machinery
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