Download e-book for iPad: Armature Windings of Electric Machines by Horace Field Parshall

By Horace Field Parshall

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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. The number of commutator segments is equal to the number of coils, and must be odd for armatures with an even number of pairs of poles but may be odd or even for armatures with an odd number of pairs of poles. The relation that must subsist in two-circuit, multipolar-ring, long-connection windings, between the number of coils () and the number of poles (n), is, 7 ; n + 1 = pitch.

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.

TWO 1 4 CIRCUIT, SINGLE WINDING. Fig. TWO 15 CIRCUIT, SINGLE WINDING. CHA1'. Ill ] TWO-CIRCUIT, SINGLE-WOUND, MULTIPOLAE KINUS, Fig. 15 In is with practice given a winding that has been used in extreme regularity of fact that segments it owing partly to the connections, and still more to the considerable all success, involves the use of twice as Only one as coils. many commutator coil in series is short-circuited at each brush, and the volts per segment are one-half what they would be The number of in the unmodified long-connection winding.

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Armature Windings of Electric Machines by Horace Field Parshall


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