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By Horace Field Parshall

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The general formula is, n s=-xym, where = number of coils, n = number of poles, y = pitch, m = number of windings. F. of "y" and "m" shall be made equal tp 1. Figure 20 represents a two-circuit, doubly re-entrant, double-wound ring armature. common " factor of " y 8=26, n=4, m=2. m common factor of y (12) and (2) is 2. Therefore the winding will be doubly re-entrant. the position shown, coils 24 and 12, in series, are short-circuited by the negative brush. The circuits through the armature are, Greatest At { I t 1 25-13-1-15-3-17 26-14-2-16-4-18 10-22-8-2 11-23-9-21-7-19-5 40 \ I ' H Fig.

Common " factor of " y 8=26, n=4, m=2. m common factor of y (12) and (2) is 2. Therefore the winding will be doubly re-entrant. the position shown, coils 24 and 12, in series, are short-circuited by the negative brush. The circuits through the armature are, Greatest At { I t 1 25-13-1-15-3-17 26-14-2-16-4-18 10-22-8-2 11-23-9-21-7-19-5 40 \ I ' H Fig. TWO CIRCUIT, 20 DOUBLE WINDING. ,Fig. TWO CIRCUIT, 2 1 DOUBLE WINDING, CHAP. ] TWO-CIKCUIT, MULTIPLE-WOUND, MULTIPOLAE RINGS. Figure 21 represents a two-circuit, double-wound ring armature.

Where y was even, Corresponding ends of 34, connected together; thus, the end of 1 and the and the beginning of 11, etc. At the position shown, coils 5, 10, 15, and 20 are short-circuited by the negative brush, and the circuits through of 6, the beginning of 6 the armature are, " f | 22-17-12- 7-2-19-14- 9 3- 8-13-18-1- 6-11-16-21-4 } 1 The winding is subject to the disadvantages noted in connection with Fig. 17, page 34. Instead of having the objectionable crossings at the terminals of the coils, as shown in Fig.

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