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What is the condition of retrogressive winding?

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What is the condition of retrogressive winding?

(a) Yb > Yf

(b) Yb < Yf

(c) Yb = Yf

(d) No condition in bterms of Yb and Yf

The question was posed to me in semester exam.

The doubt is from Lap Winding topic in chapter Armature Windings of DC Machines

1 Answer

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Best answer
Right answer is (b) Yb < Yf

The best I can explain: The coil side displacement of the front-end connection is called the front-pitch. The coil side displacement of the back-end connection is called the back-pitch. The direction in which the winding progresses depends upon which is more, Yb or Yf. For retrogressive winding Yb < Yf .

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