Lynde, Carleton John, b. 1872 · New York, Macmillan · leaf 242
he core is in the shape of a ring, thearmature is called a ring armature. The commutators of direct-current dynamos have as manysections as there are coils on the armature. The field magnet of a direct-current dynamo is energized bypart of the current produced by the dynamo. The field magnetof an… … FIG. 164.— A commercial direct-current dynamo. Y has six poles. These are alternately north and southpoles. The armature B B, shown on the right, is a drumarmature. It consists of many coils wound lengthwise on asoft iron drum. The coils are attached to the strips of thecommutator in series. A…
Physics · Home Economics
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