Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 76
in Fig. 61 and is also shown in Fig. 66. These rubbingcontacts form what is called the commutator, and the individualcontacts are called the commutator segments. In Fig. 61, current enters the machine at the negative brushB-, passes through the commutator leads a to the winding Art. 60] ARMATURE… … Fig. 66.—Armature with a Gramme ring winding. the amount of current passing through the machine dependsentirely on the resistance R of the external circuit. 60. Multipolar Windings.—It has been found economical in
Electrical engineering
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