Specifications

58
Short Pitch Winding
It is assumed that the winding is short pitched by 1 slot.
Therefore, coil span = 11, in terms of slots, or Y
b
= 23 in terms of coil sides.
The winding pitch, Y = +2 (progressive winding).
The front pitch, Y
f
= Y
b
– Y = 23 – 2 = 21 in terms of coil sides.
Table 4.8 gives the winding table for RYB or ABC Phase, in terms of coil sides.
Table 4.8 Winding Table for RYB Phases in terms of coil sides
S.No. R Phase in terms of coil sides
1 Start 1 1 + 23 = 24
2 24-21= 3 3+23= 26
1 26 – 21 = 5 5 + 23 = 28
2 28 – 21 = 7 7 + 23 = 30
3 30 – 21 = 9 This coil side belongs to other phase.
Therefore coil side 30 is connected to coil side 6.
4 6 + 48 – 23 = 31 31 – 48 + 21 = 4
1 4 + 48 – 23 = 29 29 – 48 + 21 = 2
2 2 + 48 – 23 = 27 27 + 21 = 48
3 48 – 23 = 25 Finish
Y Phase in terms of coil sides
4 Start 17 17 + 23 = 40
5 40 – 21 = 19 19 + 23 = 42
6 42 – 21 = 21 21 + 23 = 44
7 44 – 21 = 23 23 + 23 = 46
8 46 – 21 = 25 This coil side belongs to other phase.
Therefore coil side 46 is connected to coil side 22.
9 22 + 48 – 23 = 47 47 – 48 + 21 = 20
10 20 + 48 – 23 = 45 45 – 48 + 21 = 18
11 18 + 48 – 23 = 43 43 - 48 + 21 = 16
12 16 + 48 – 23 = 41 Finish
B Phase in terms of coil sides
1 Start 33 33 + 23 - 48 = 8
2 8 – 21 + 48 = 35 35 + 23 - 48 = 10
3 10 – 21 + 48 = 37 37 + 23 - 48 = 12
4 12 – 21 + 48 = 39 39 + 23 - 48 = 14
5 14 – 21 + 48 = 41 This coil side belongs to other phase.
Therefore coil side 41 is connected to coil side 38.
6 38 – 23 = 15 15 + 21 = 36
7 36 – 23 = 13 13 + 21 = 34
8 34 – 23 = 11 11 + 21 = 33
9 33 – 23 = 9 Finish