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See Full PDFDownload PDF. SOLVED PROBLEMS ON DC MACHINE MAGNETIC CIRCUIT Example.1 Calculate the ampere-turns turns for the air gap of a dc machine given the following data. Gross core length = 40cm, air gap length = 0.5cm, number of ducts = 5, width of duct = 1.0cm, slot pitch = 6.5cm, slot opening = 0.5cm, average value of flux density in the ... dora slot 888