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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 YfThe question was posed to me in semester exam.The doubt is from Lap Winding topic in chapter Armature Windings of DC Machines

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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