. A text-book of electrical engineering;. re 10, we place on segment settles the current in wires 13 and 6, and the current path throughthe armature is as follows: 9 12 1 4 7 1014 II 8 5 2 13 -f- The odd number of coils causes, at times, a slight dissymmetry betweenthe two armature paths. Here again 4 brushes could be used, or, in general, 2p brushes separated by ^-T degrees. In Fig. 114, for example, two more brushes are shown2p dotted, lying diametrically opposite to those on segments I and II. Since the brushes of like sign will be connected together, the coils 3—6 and 2—13, lying m
. A text-book of electrical engineering;. re 10, we place on segment settles the current in wires 13 and 6, and the current path throughthe armature is as follows: 9 12 1 4 7 1014 II 8 5 2 13 -f- The odd number of coils causes, at times, a slight dissymmetry betweenthe two armature paths. Here again 4 brushes could be used, or, in general, 2p brushes separated by ^-T degrees. In Fig. 114, for example, two more brushes are shown2p dotted, lying diametrically opposite to those on segments I and II. Since the brushes of like sign will be connected together, the coils 3—6 and 2—13, lying more or less in the neutral zone, will be short-circuited at the moment T. E. 9 130 Electrical Engineenng represented in the figure. The path of the current through the armaturewill then be as follows: + 9 12 I 4 7 1014 II 8 5 As in the series ring-winding p coils are connected in series between twoneighbouring segments. This can be obviated, with a view to improvingthe commutation, by niaking the number of segments p times the number. of coils. Those segments which are separated by ^v- degrees are then inter-connected. In Fig. 115, for example, C7 = 16 and p = 3, whence 16 + 2 The winding proceeds as follows: i^—^4—7—10, etc. Of the connectionswithin the commutator, only those are shown which are of importance atthe moment. The others are clearly indicated by means of the letters onthe segments. The arrows are now drawn on the front end-connections. Assuming thatthe coils I—/[ and 9—12, lying in the neutral zone, are short-circuited at the 48. Two-circuit Drum-winding 131 + moment chosen, we get the position for the brushes shown in the figure. Thepath of the current is then as follows: 6 3 16 13 10 715 2 5 8 II 14Naturally, as the segments are connected in groups of p, the number ofbrushes can be increased to 2p.
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