SOLVED PROB Example.1 Calculate the ampere-turns fo Gross core length = 40cm, = 1.0cm, slot pitch = 6.5cm, =0.63T. Field form factor = Carter’s coefficient=0.82 for Note: If the Carter’s coeffici Carter’s coefficient given i Therefore and are to less like 1, 2 or 3 and the Car close to zero, then it may be ! " #$ #$ %#& ’ # )#$ )#$ *#$ %*#(+ % BLEMS ON DC MACHINE MAGNETIC CIR or the air gap of a dc machine given the followin air gap length = 0.5cm, number of ducts = slot opening = 0.5cm, average value of flux de 0.7, Carter’s coefficient = 0.72 for opening/ga opening/gap-length = 1.0. ient given is greater than 1.0, then it may be is less than 1.0, then it may be ’ . or%/ ’ o be found out to find out .When the ratio ! rter’s coefficient given is close to 1.0, then it ma %/’ . +, or % / 0 +. 1 2 2 *3 %*’ + ( %#%4 ,- 5 5/6 ! % / 0 1 RCUIT ng data. = 5, width of duct ensity in the air gap ap-length = 2.0 and & 78 9: 7 . If the ’ . +, 0 or% / 0 +. ! " ; o r ! ; is ay be ’ or0 . If it is 0 +