. The principles underlying radio communication . pole. Itis connected at the back of the armature to i, which lies undera N pole and is soldered into segment 2. Starting at 2, wehave d under the edge of the S pole back-connected to k underthe edge of the N pole; k is attached to segment 3. Continuingin the same way all around the armature we finally have 16loops connected to the 16 commutator segments. It will beunderstood that an actual machine has a great many more turnsin the armature winding and a larger number of commutatorsegments. IS2 DYNAMO-ELECTRIC MACHINERY. At the four segments mar
. The principles underlying radio communication . pole. Itis connected at the back of the armature to i, which lies undera N pole and is soldered into segment 2. Starting at 2, wehave d under the edge of the S pole back-connected to k underthe edge of the N pole; k is attached to segment 3. Continuingin the same way all around the armature we finally have 16loops connected to the 16 commutator segments. It will beunderstood that an actual machine has a great many more turnsin the armature winding and a larger number of commutatorsegments. IS2 DYNAMO-ELECTRIC MACHINERY. At the four segments marked + or — contact is made withbrushes leading to the external circuit. By the right-handrule 10 the emf. in conductors under the N pole is toward theback end, so current flows into the armature at segment 3. Thebrush on that segment is therefore negative. The brush atsegment 7 is positive, because there the current flows out ofthe armature. Similar reasoning applied to the conductorsunder the S poles leads to the same result as to polarity of. Scheme of A - po\a Drum ^l,?.3.«te. Commutator ^m — nts T — + - Location of brvah«« &f},c.,ctc Armature conducTora *l,S. - r~i<»l<J ^oles the brushes, which are thus seen to be alternately, one positiveand the next negative, as we go around the commutator. Ifa machine having more than two sets of brushes is examined,it will be found that all the positive brushes are joined by aheavy conductor and all the negative brushes by another. Thenone connection is made from the group of positive brushes tothe external circuit, and one from all the negative brushes. In speaking of alternators, the actual construction of arma-tures was described; that is, the use of machine-wound coils inslots in the face of a laminated core. armatures are made 10 See section 63, p. 153.
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Keywords: ., bookcentury1900, bookdecade1920, bookpublisherwashi, bookyear1922
