Horace Field Parshall's Armature Windings of Electric Machines PDF

By Horace Field Parshall

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To the other four times per revolution, being short-circuited at the neutral point for a brief period at the occurrence of eacli of these transfers. These features are secured by adding one section to the doubly re-entrant double winding shown in Fig. 10, and, as in that figure, making the connections, not between adjacent sections, but always by passing over one section. The number of sections being odd, it will be seen that after having progressed twice around the ring, all sections will have been passed through, and the winding will have arrived at the other terminal of the section from which it started.

6 the number of commutator segments 11 made is equal to half the number of coils by connecting two coils in between each pair of adjacent segments. The coils so connected in series are situated in adjoining fields of opposite This winding has the disadvantage that coils at polarity. series quite different potentials are adjacent, as may be seen by fol- lowing through the various armature circuits from brush to This increases the difficulty of insulating. The volts brush. per bar also, for the same number of conductors per twice as high as in the simple for any reason, to halve the erable to combine two in cases it would be adjacent coils into one, advantages of the simple But gramme ring.

Die Gleichstrom-Dynamomaschiuen, Fig 64. [CHAP. i. W//A Fig. 5 FOUR CIRCUIT SINGLE WINDING. Fig. 6 FOUR CIRCUIT SINGLE WINDING. CHAP, SINGLE-WOUND GRAMME KINGS. ] In Fig. 6 the number of commutator segments 11 made is equal to half the number of coils by connecting two coils in between each pair of adjacent segments. The coils so connected in series are situated in adjoining fields of opposite This winding has the disadvantage that coils at polarity. series quite different potentials are adjacent, as may be seen by fol- lowing through the various armature circuits from brush to This increases the difficulty of insulating.

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