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Equalizer rings are needed in lap winding.

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in DC Machines by (506k points)
Equalizer rings are needed in lap winding.

(a) False

(b) True

This question was addressed to me in an international level competition.

This key question is from Lap Winding topic in portion Armature Windings of DC Machines

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Right answer is (b) True

The explanation is: Each parallel path in lap winding is under the influence of one pair of poles, so if a machine consists of multiple pairs of poles then dissimilarities occurs, due to which unequal voltages may be induced in the paths and a circulating current may flow. In wave winding each path is under the influence of all poles, so voltages are induced in each path causing no such dissimilarities like lap winding. Equalizers in lap windings are used to remove this dissimilarity, they’re not needed in wave winding.

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