Specifications

54
Table 4.5 gives the winding table for RYB Phases.
Table 4.5 Winding Table for RYB Phases
S.No. Top coil side (-Y
f
)
Bottom coil side (+Y
b
)
R or A phase per pole per phase
11 14
23 16
313 26
415 28
525 38
627 40
737 2
839 4
Y or B phase per pole per phase
99 22
10 11 24
11 21 34
12 23 36
13 33 46
14 35 48
15 45 10
16 47 12
B or C phase per pole per phase
17 5 18
18 7 20
19 17 30
20 19 32
21 29 42
22 31 44
23 41 6
24 43 8
Fig. 4.22 gives the complete main winding diagram for 3 phase 4 pole 24 slots double layer
lap winding.
Problem 2 : Develop the layout of a lap winding for a 3 phase ac machine having 2 pole and 24
slots. There are 2 coil sides per slot.
Solution : Coil groups per phase = 3 x 2 = 6. Slots per pole per phase, m = = 4
Angle between adjacent slots, â =
180
24
2
= 15
0
ε. For full pitch coils, the coil span, á = 0, ie.,
angle between the two sides of the same coil is 180
0
e.
24
3x2