Armature Windings of Electric Machines by Horace Field Parshall

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By Horace Field Parshall

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Where the shape somewhat unequal magnetic coil, If it is necessary, of the frame necessitates circuits, this connection averages in the various coils, and therefore tends to diminish the sparking which might, with a simple gramme ring in such an unbalanced magnetic system, be considerable. If * coil is = number of coils, and n = number connected across to one ( \>i 1 ) in of poles, then any advance of and it, J the two free ends of this pair of coils are connected to adjacent commutator segments.

For a triple winding, greater than the two-circuit, 9 10 1 2 31 8 7 6 5 4 J 10' 1' 2' 3' 1 7' 6' 5' 4'J coils 3 and ' After the armature has revolved through circuits through the armature will become, |9 width of two segments, etc. doubly re-entrant, double-wound, simple gramme ring, the -^=9, 8 will be short-circuited, and the Fig. TWO 9 CIRCUIT DOUBLE WINDING Of THS ^ I7BRSJ Fig. 10 FOUR CIRCUIT DOUBLE WINDING. VlIIAl'. ] DOUBLE-WOUND GRAMME RINGS. in a four-pole Figure 10 shows a similar winding in the The circuit through the armature position shown | 16 17 19 field.

Be designated as the long-connection type of the two-circuit gramme winding, and one of its chief advantages is, that no great differences of potential exist between adjacent coils. It may In the figure is shown the case of a four-pole, two-circuit, single-wound, long-connection ring armature. 29 1 8 15 7 f 11 14 1 Coils 3 and 10, in series, are at this instant short-circuited by the negative brush. A little later, coils and 15 will be short-circuited by the positive brush. When this occurs, the negative brush will bear upon the middle of a segment.

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